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Coordination of distinctive pesticide adjuvants and atomization nozzles on droplet spectrum evolution for spatial drift reduction
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作者 Shidong Xue Jingkun Han +3 位作者 Xi Xi Zhong Lan Rongfu Wen Xuehu Ma 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第2期250-262,共13页
Pesticide adjuvants,as crop protection products,have been widely used to reduce drift loss and improve utilization efficiency by regulating droplet spectrum.However,the coordinated regulation mechanisms of adjuvants a... Pesticide adjuvants,as crop protection products,have been widely used to reduce drift loss and improve utilization efficiency by regulating droplet spectrum.However,the coordinated regulation mechanisms of adjuvants and nozzles on droplet spectrum remain unclear.Here,we established the relationship between droplet spectrum evolution and liquid atomization by investigating the typical characteristics of droplet diameter distribution near the nozzle.Based on this,the regulation mechanisms of distinctive pesticide adjuvants on droplet spectrum were clarified,and the corresponding drift reduction performances were quantitively evaluated by wind tunnel experiments.It shows that the droplet diameter firstly shifts to the smaller due to the liquid sheet breakup and then prefers to increase caused by droplet interactions.Reducing the surface tension of sprayed liquid facilitates the uniform liquid breakup and increasing the viscosity inhibits the liquid deformation,which prolong the atomization process and effectively improve the droplet spectrum.As a result,the drift losses of flat-fan and hollow cone nozzles are reduced by about 50%after adding organosilicon and vegetable oil adjuvants.By contrast,the air induction nozzle shows a superior anti-drift ability,regardless of distinctive adjuvants.Our findings provide insights into rational adjuvant design and nozzle selection in the field application. 展开更多
关键词 Pesticide drift spray droplets Particle size distribution spray atomization Transport processes ADJUVANTS
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AgNi15 composite particles prepared by ultrasonic arc spray atomization method
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作者 谢建斌 温春明 +2 位作者 秦国义 许思勇 郭锦新 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3556-3561,共6页
Ultrasonic arc spray atomization (UASA) method was used to prepare high-melting-point, immiscible AgNi15 (mass fraction, %) composite particles. Sieving was used to determine the size distribution of the AgNi15 partic... Ultrasonic arc spray atomization (UASA) method was used to prepare high-melting-point, immiscible AgNi15 (mass fraction, %) composite particles. Sieving was used to determine the size distribution of the AgNi15 particles. The morphology, rapidly solidified structure and metastable solution expansion of the AgNi15 particles were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS), respectively. The results show that the AgNi15 composite particles are spherical and well-dispersed, and the mass fractions of the particles with diameters <74μm and <55 μm are 99.5% and 98%, respectively. The rapidly solidified structure of the AgNi15 particles consists of spherical nickel-richβ(Ni)-phase particles dispersed throughout a silver-richα(Ag)-phase matrix andα(Ag)-phase nanoparticles dispersed throughout largerβ(Ni)-phase particles. The silver and nickel in the AgNi15 particles form a reciprocally extended metastable solution, and the solid solubility of nickel in the silver matrix at room temperature is in the range of 0.16%?0.36% (mole fraction). 展开更多
关键词 AgNi15 composite particle ultrasonic arc spray atomization rapidly solidified structure metastable solution extension
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Investigations of the effects of two typical jet crushing methods on the atomization and dust reduction performance of nozzles 被引量:2
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作者 Han Han Hetang Wang +3 位作者 Qi Zhang Yunhe Du Haojie Wang Hui Wang 《International Journal of Coal Science & Technology》 EI CAS CSCD 2023年第4期92-106,共15页
Single-fuid nozzles and dual-fuid nozzles are the two typical jet crushing methods used in spray dust reduction. To distinguish the atomization mechanism of single-fuid and dual-fuid nozzles and improve dust control e... Single-fuid nozzles and dual-fuid nozzles are the two typical jet crushing methods used in spray dust reduction. To distinguish the atomization mechanism of single-fuid and dual-fuid nozzles and improve dust control efciency at the coal mining faces, the atomization characteristics and dust reduction performance of the two nozzles were quantitatively compared. Results of experiments show that, as water supply pressure increased, the atomization angle of the swirl pressure nozzle reaches a maximum of 62° at 6 MPa and then decreases, but its droplet size shows an opposite trend with a minimum of 41.7 μm. The water supply pressure helps to improve the droplet size and the atomization angle of the internal mixing air–liquid nozzle, while the air supply pressure has a suppressive efect for them. When the water supply pressure is 0.2 MPa and the air supply pressure reaches 0.4 MPa, the nozzle obtains the smallest droplet size which is 10% smaller than the swirl pressure nozzle. Combined with the dust reduction experimental results, when the water consumption at the working surface is not limited, using the swirl pressure nozzle will achieve a better dust reduction efect. However, the internal mixing air–liquid nozzle can achieve better and more economical dust reduction performance in working environments where water consumption is limited. 展开更多
关键词 Dust control spray nozzle atomization characteristics Dust reduction performance
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Simulation of Droplet-gas Flow in the Effervescent Atomization Spray with an Impinging Plate 被引量:6
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作者 钱丽娟 林建忠 熊红兵 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第1期8-19,共12页
Abstract A comprehensive three-dimensional model of droplet-gas flow was presented to study the evolution of spray in the effervescent atomization spray with an impinging plate. For gas phase, the N-S equation with t... Abstract A comprehensive three-dimensional model of droplet-gas flow was presented to study the evolution of spray in the effervescent atomization spray with an impinging plate. For gas phase, the N-S equation with the κ-ε turbulence model was solved, considering two-way coupling interaction between droplets and gas phase. Dispersed droplet phase is modeled as Lagrangian entities, accounting for the physics of droplet generation from primary and secondary breakup, droplet collision and coalescence, droplet momentum and heat transfer. The mean size and sta- tistical distribution of atomized droplets at various nozzle-to-plate distances were calculated. Some simulation resuits were compared well with experimental data. The results show that the existence of the impinging plate has a pronounced influence on the droplet mean size, size distribution and the droplet spatial distribution. The air-to-liquid ratio has obvious effects on the droplet size and distribution. 展开更多
关键词 effervescent atomization spray impinging plate droplet distribution Sauter mean diameter SIMULATION
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Shape-predicted model of spray forming rod under scanning atomization 被引量:2
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作者 CAO Fuyang,WU Peilian,NING Zhiliang,ZHAO Wenjun,and SUN Jianfei Key Laboratory for Procession Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China 《Rare Metals》 SCIE EI CAS CSCD 2007年第S1期30-35,共6页
A model for simulating the spray forming process with scanning atomizer was developed.Models for the scanning atomization and the deposition processes were coupled together in order to obtain a new description of the ... A model for simulating the spray forming process with scanning atomizer was developed.Models for the scanning atomization and the deposition processes were coupled together in order to obtain a new description of the spray forming process.The model,which is able to predict the shape of a spray-formed billet prepared with scanning atomizer,was established after analyzing the changes in droplet size and density distribution along the r-axis in the spray cone in scanning atomization.The effects of the two kinds of atomization were compared,showing that the scanning atomization is good for deposition. 展开更多
关键词 spray forming atomization modeling rapid solidification scanning atomization
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A NEW CENTRIFUGAL ATOMIZATION TECHNIQUE OF SPRAY ROTATION FOR POWDER PREPARATION 被引量:1
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作者 Chen Shizhu Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083 《中国有色金属学会会刊:英文版》 CSCD 1997年第4期13-16,共4页
ANEWCENTRIFUGALATOMIZATIONTECHNIQUEOFSPRAYROTATIONFORPOWDERPREPARATION①ChenShizhuDepartmentofMaterialsScienc... ANEWCENTRIFUGALATOMIZATIONTECHNIQUEOFSPRAYROTATIONFORPOWDERPREPARATION①ChenShizhuDepartmentofMaterialsScienceandEnginering,Ce... 展开更多
关键词 spray ROTATION CENTRIFUGAL atomization ROTARY speed fluid LUBRICATION
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Analysis of Solidification in Spray Atomized and Codeposited Metal-matrix Composites Part Ⅰ: Atomization
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作者 V.Erukhimovitch and J.Baram(Materials Engineering Department, Ben-Gurion University of Negev, Beer-Sheva, Israel) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第2期79-90,共12页
Fluid mechanics, heat transfer and liquid-to-solid phase transformation are assessed in optimizing the spray atomization and codeposition process parameters for size refinement and microstructural uniformity of the de... Fluid mechanics, heat transfer and liquid-to-solid phase transformation are assessed in optimizing the spray atomization and codeposition process parameters for size refinement and microstructural uniformity of the deposited material. Atomization gas velocities, atomized droplets velocities, convective heat transfer coefficients, thermal histories of the solidifying droplets, freezing rates, fraction solid evolution and solid-liquid interface propagation velocity are calculated. The influence, on the deposit microstructural features, of process parameters like the atomization gas pressure, the pouring tube orifice diameter, the geometrical features of the atomization device,the potency of , pre-existing or injected as reinforcement, nucleation sites, the wetting angle between the liquid melt bnd impurity particles acting as preferred nucleation sites, the in-flight distance of the solidifying droplets in the atomization chamber, i5 evaluated. As a result of the evaluation, appropriate choice of the adjustable process parameters for the production of powders and/or deposits with desired grain size and microstructure, can be made. 展开更多
关键词 Co FIGURE atomization Analysis of Solidification in spray atomized and Codeposited Metal-matrix Composites Part
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Effects of different nozzle materials on atomization results via CFD simulation 被引量:4
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作者 Xiangyu Li Jianjun Du +2 位作者 Licheng Wang Jiangli Fan Xiaojun Peng 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第2期362-368,共7页
Spray drying,as a crucial operation in industrial production,converts solution to fine particle.The spray moiety directly affects the final particle morphology,size and distribution.Compared with the experimental meth... Spray drying,as a crucial operation in industrial production,converts solution to fine particle.The spray moiety directly affects the final particle morphology,size and distribution.Compared with the experimental method,computational fluid dynamics(CFD)modeling is a powerful and convenient tool for simulating the spray process.Based on the verified CFD model,different materials of atomizer were simulated to investigate the effect on droplet size and distribution in this work.The modeling result proved that the droplet size and distribution were influenced by the resistance coefficient of materials,wherein the Reynolds number could change the effect of roughness along with the change of mass flow rate on spray process.The results in this work have implication for controlling droplet size through developing new spray nozzle with different materials or surface coating. 展开更多
关键词 CFD modeling spray process atomIZER MATERIALS DROPLET SIZE SIZE distribution
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ON THE INSTABILITY IN GAS ATOMIZATION 被引量:3
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作者 马峥 周哲玮 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1999年第10期1061-1066,共6页
The instability theory of fluid flow is applied in gas atomization and the results show that the instability of interfacial wave is the main cause of gas atomization. The size of the droplets and its change with param... The instability theory of fluid flow is applied in gas atomization and the results show that the instability of interfacial wave is the main cause of gas atomization. The size of the droplets and its change with parameters are also studied, the results are compatible with the experiments. 展开更多
关键词 gas atomization spray forming instability of interfacial wave
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Numerical simulation of heavy fuel oil atomization using a pulsed pressure-swirl injector 被引量:2
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作者 S.M.A.Najafi P.Mikaniki H.Ghassemi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第4期61-69,共9页
It is known that increasing the injection pressure reduces the breakup length and the droplet size.Adding pulses,on the other hand,helps to atomize the liquid into finer droplets,similar to airassisted injectors but w... It is known that increasing the injection pressure reduces the breakup length and the droplet size.Adding pulses,on the other hand,helps to atomize the liquid into finer droplets,similar to airassisted injectors but without altering the airtofuel concentration.To further reduce the droplet size and breakup length,a novel injector type,called''Pulsed PressureSwirl"(PPS),is introduced in this work,which is a combination of pressureswirl and ultrasonic pulsed injectors.A pressureswirl atomizer was designed and fabricated specifically for Mazut HFO(Heavy Fuel Oil).The droplet formation process and droplet size distribution have been studied experimentally(by shadowgraphy high speed imaging)and numerically(with the opensource VolumeofFluid code Gerris).Changing liquid injection pressure effect on the spray angle and film thickness has been quantified.These simulations have been used to study the primary breakup process and quantify the droplet size distributions,using different injection pulse frequencies and pressures.The numerical results have revealed that the new injector concept successfully produces finer droplets and results in a decrease in the breakup length,especially when applying high pulse frequencies,with no significant changes in the spray angle. 展开更多
关键词 spray Heavy fuel oil Mazut atomization Pulsed Pressure-Swirl INJECTOR
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Design and Atomization Characteristic of Laval-style Annular Slot Nozzle 被引量:3
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作者 Chao-Run Si Xian-Jie Zhang +1 位作者 Jun-Biao Wang Yu-Jun Li 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第3期40-47,共8页
Gas mass flux rate,metal mass flux rate and outlet gas velocity are three atomization scale parameters which greatly affect the atomization efficiency. A Laval-style annual slot supersonic nozzle is designed by optimi... Gas mass flux rate,metal mass flux rate and outlet gas velocity are three atomization scale parameters which greatly affect the atomization efficiency. A Laval-style annual slot supersonic nozzle is designed by optimizing the geometric parameters of delivery tube outlet and gas outlet to obtain applicable atomization scale parameters. A computational fluid flow model is adopted to investigate the effect of atomization gas pressure ( P0 ) on the gas flow field in gas atomization progress. The numerical results show that the outlet gas velocity of the nozzle is not affected by P0 and the maximum gas velocity reaches 452 m / s. The alternation of aspiration pressure ( ΔP) is caused by the variations of stagnation pressure and location of Mach shock disk, and hardly by the location of stagnation point. The aspiration pressure is found to decrease as P0 increases when P0 < 1. 3 MPa. However,at a higher atomization gas pressure increasing P0 causes an opposite: the aspiration pressure atomization increases with the gas pressure,and keeps a plateau when P0 > 2. 0 MPa. The minimum aspiration pressure ΔP = - 70 kPa is obtained at P0 = 1. 3 MPa. The results indicate that the designed Laval- style annual slot nozzle has well atomization characteristic at lower atomization pressure. 展开更多
关键词 spray forming gas atomization laval nozzle annular slot nozzle
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Resonant behaviors of ultra-sonic gas atomization nozzle with zero mass-flux jet actuator 被引量:2
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作者 祖洪彪 王志亮 《Journal of Shanghai University(English Edition)》 CAS 2011年第3期166-172,共7页
The resonant behaviors of an ultra-sonic gas atomization nozzle with a zero mass-flux jet actuator were numerically investigated with FLUENT software by using a double precision unsteady two-dimensional pressure-based... The resonant behaviors of an ultra-sonic gas atomization nozzle with a zero mass-flux jet actuator were numerically investigated with FLUENT software by using a double precision unsteady two-dimensional pressure-based solver. The Spalart-Allmaras turbulence model was adopted in the simulations. Numerical results indicated that the oscillation properties of the gas efflux were effectively improved. Several resonatory frequencies corresponding to different vibration modes of gas were distinguished in the nozzle. With the changing of nozzle geometric parameters, different characters among those modes were elucidated by analyzing the propagations of pressure waves. 展开更多
关键词 spray atomization ultra-sonic gas atomization nozzle resonance numerical simulation
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Effects of atomization parameters of dust removal nozzles on the de-dusting results for different dust sources 被引量:6
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作者 Cheng Weimin Ma Youying +1 位作者 Yang Junlei Sun Biao 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第6期1025-1032,共8页
In order to obtain appropriate spray pressure and enhance the spraying and dust removal efficiency, various factors including the dust characteristics, nozzle spraying angle, effective spraying range, water consumptio... In order to obtain appropriate spray pressure and enhance the spraying and dust removal efficiency, various factors including the dust characteristics, nozzle spraying angle, effective spraying range, water consumption and droplet size are taken into account. The dust characteristics from different mines and atomization parameters of different pressure nozzles were measured. It was found that the internal pressure of coal cutters and roadheaders should be kept at 2 MPa, which could ensure large droplet size, large spraying angle and low water consumption and hence realizing a large-area covering and capture for large particle dusts. However, the external spray pressure should be kept at 4 MPa for smaller droplet size and longer effective spraying range, leading to effective dust removal in the operator zone. The spray pressure of support moving, drawing opening, and stage loader on a fully mechanized caving face and stage loader on a fully mechanized driving face should be kept at 8 MPa, under which the nozzles have long effective spraying range, high water flow and small droplet size for the rapid capture of instantaneous, high-concentration and small size dust groups. From the applications on the caving and driving faces in the coal mines, it is indicated that the optimization of spray pressure in different spraying positions could effectively enhance dust removal efficiency. Selecting appropriate nozzles according to the dust characteristics at different positions is also favorable for dust removal efficiency. With the selected nozzles under optimal pressures, the removal rates of both total dust and respirable dust could reach over70%, showing a significant de-dusting effect. 展开更多
关键词 Dust sources Dust size Types of spraying nozzle spray pressure atomization parameters
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Predictive models for characterizing the atomization process in pyrolysis of methyl ricinoleate 被引量:1
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作者 Xiaoning Mao Qinglong Xie +5 位作者 Ying Duan Shangzhi Yu Xiaojiang Liang Zhenyu Wu Meizhen Lu Yong Nie 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第4期1023-1028,共6页
Pyrolysis of methyl ricinoleate(MR)can produce undecylenic acid methyl ester and heptanal which are important chemicals.Atomization feeding favors the heat exchange in the pyrolysis process and hence increases the pro... Pyrolysis of methyl ricinoleate(MR)can produce undecylenic acid methyl ester and heptanal which are important chemicals.Atomization feeding favors the heat exchange in the pyrolysis process and hence increases the product yield.Herein,predictive models to characterize the atomization process were developed.The effect of spray distance on Sauter mean diameter(SMD)of atomized MR droplets was examined,with the optimal spray distance to be 40-50 mm.Temperature mainly affected the physical properties of feedstock,with smaller droplet size obtained at increasing temperature.In addition,pressure had significant influence on SMD and higher pressure resulted in smaller atomized droplets.Then,a model for SMD prediction,combining temperature,pressure,spray distance,and structural parameters of nozzle,was developed through dimensionless analysis.The results showed that SMD was a power function of Reynolds number(Re),Ohnesorge number(Oh),and the ratio of spray distance to diameter of swirl chamber in the nozzle(H/dsc),with the exponents of-1.6618,-1.3205 and 0.1038,respectively.The experimental measured SMD was in good agreement with the calculated values,with the error within±15%.Moreover,the droplet size distribution was studied by establishing the relationship between the standard deviation of droplet size and SMD.This study could provide reference to the regulation and optimization of the atomization process in MR pyrolysis. 展开更多
关键词 atomization Methyl ricinoleate pyrolysis Predictive model Sauter mean diameter(SMD) spray distance
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Numerical calculation of temperature and phase change during the process of atomizing spray quenching on drilling pipe 被引量:1
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作者 QitangLi GuozengYang JianguoZhang 《Journal of University of Science and Technology Beijing》 CSCD 2003年第2期60-64,共5页
A finite element method (FEM) procedure was developed in order to simulatethe quenching process for drilling pipe (DP). The calculating model was based ontime-temperature-transformation (TTT) diagrams, and incorporate... A finite element method (FEM) procedure was developed in order to simulatethe quenching process for drilling pipe (DP). The calculating model was based ontime-temperature-transformation (TTT) diagrams, and incorporated with material properties dependenton temperature. The procedure was used to calculate the temperature-time histories, describe thephase transformations of atomizing spray quenching for DP in the welding zone, and predict thehardness distribution in radius direction after quenching in the zone. The calculated results metwell with that of experiments. It was easy to determine the parameters such as volume and pressureof the cooling water and compressed gas by use of the numerical calculation and experiments, becausethe value of convection coefficient was decided greatly by the mixture of the cooling water andcompressed gas. Moreover, the simulating results were helpful not only to design the quenchingequipment, but also to optimize the quenching process for DP's welding zone. 展开更多
关键词 FEM atomizing spray quenching drilling pipe heat-treatment
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Spray Atomized and Codeposited Al-Li Based Metal-matrix Composites Processing and Properties 被引量:1
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作者 E. Raskin S. Nayim M.Polak and J.Baram(Materials Engineering Dept., Ben-Gurion University of the Negev, Beer-Sheva, Israel )A.N.Sembira(Nuclear Research Center, Negev, Beer-Sheva, Israel)(To whom correspondence should be addressed) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第5期329-339,共11页
In spray atomization and codeposition, a molten stream of metal is disintegrated into a fine dispersion of droplets by high velocity gas jets. The resulting semi-solidified droplets are directed towards a substrate wh... In spray atomization and codeposition, a molten stream of metal is disintegrated into a fine dispersion of droplets by high velocity gas jets. The resulting semi-solidified droplets are directed towards a substrate where they impact and collect as rapidly solidified splats. Relatively high rates of solidification are achieved as a result of the thinness of the splats and the rapid heat extraction during flight and upon impacting with the substrate. The processing method uses codeposition of the metallic semi-solidified droplets (metallic matrix) with the injected reinforcement ceramic particles. In the present paper, the microstructures, mechanical properties, interfacial properties, thermal stability and aging behaviour of spray atomized and codeposited Al-Li-X MMC's (injected X=SiC, Al2O3) are reported and correlated to the processing conditions. 展开更多
关键词 LI Al spray atomized and Codeposited Al-Li Based Metal-matrix Composites Processing and Properties
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Analysis of Solidification in Spray Atomized and Codeposited Metal-matrix Composites Part Ⅱ:Reinforcement Injection and Deposition 被引量:1
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作者 V. Erukhimovitch and J.Baram (Materials Engineering Department, Ben-Gurion University of Negev, Beer-Sheva, Israel) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第3期165-170,共6页
The influence of the injection of reinforcing particles (for the production of metal matrix composites and of the droplets-to-substrate heat transfer on the resulting microstructural uniformity of spray atomized and c... The influence of the injection of reinforcing particles (for the production of metal matrix composites and of the droplets-to-substrate heat transfer on the resulting microstructural uniformity of spray atomized and codeposited composite material is analyzed. The reinforcement particles injection velocity has to be limited between an upper and a lower critical values. in order to ensure entrapment into the matrix droplets in flight. The thermal history of the injected droplets during the deposition stage is calculated with the assumption that the in-flight solidifying droplets reach the substrate while containing still at least 20% liquid volume fraction, in order to avoid porosity of the deposited material. The substrate to pouring-tube orifice distance where that condition is achieved depends strongly on the atomization pressure and the convective heat transfer coefficient of the substrate. It is demonstrated that 'tailoring' the microstructures and the reinforcement volume percent in the deposited material is feasible. The critical process parameters : the atomization pressure, the melt flow rate. the substrate to pouring-tube orifice distance, the reinforcement particles injection location and rate can all be adequately chosen in order to obtain any desired microstructure, grain size, reinforcement volume percent, with the additional benefit, if wanted, of rapid solidification processing 展开更多
关键词 Analysis of Solidification in spray atomized and Codeposited Metal-matrix Composites Part Reinforcement Injection and Deposition Vc
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Experimental Study on Spray Cooling Performance of Pressure Atomizing Nozzle
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作者 黄晓庆 张旭 《Transactions of Tianjin University》 EI CAS 2012年第3期231-235,共5页
Aiming at the problem of air-cooled condenser output limit, a spray humidification system was presented to reduce the inlet air temperature. The pressure atomizing nozzle TF8 was chosen for inlet air spray cooling, an... Aiming at the problem of air-cooled condenser output limit, a spray humidification system was presented to reduce the inlet air temperature. The pressure atomizing nozzle TF8 was chosen for inlet air spray cooling, and the spray cooling experiment with different layouts of nozzles were conducted. Through heat and mass transfer analysis, the cooling effect fitting correlation was acquired with evaporative cooling being the major cooling mechanism. The experimental results under different nozzle layouts show that when the product of dry ball and wet ball temperature difference and spray rate is smaller than 75 ~C-m3/h, opening the TF8 nozzles in row 1 and row 2 (row distance is 500 mm) has better cooling effect than those in row 1 and row 3 (row distance is 1 000 mm), while when the product is larger than 75 ~C'm3/h, opening the TF8 nozzles in row 1 and row 3 is superior in cooling effect to those in row 1 and row 2. 展开更多
关键词 pressure atomizing nozzle spray cooling fitting correlation nozzle layout
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Investigation on Atomization Performance of a Slinger
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作者 Wenlong Tan Weijun Fan +2 位作者 Qiang Shi Hanqing Xu Rongchun Zhang 《Journal of Harbin Institute of Technology(New Series)》 CAS 2021年第6期1-13,共13页
Slinger is a type of rotary atomizer wherein spray spatial distribution varies with the rotary speed and mass flowrate.The spray parameters at a series of locations in the radial direction of the slinger were measured... Slinger is a type of rotary atomizer wherein spray spatial distribution varies with the rotary speed and mass flowrate.The spray parameters at a series of locations in the radial direction of the slinger were measured and the parameters of the location where the spray Sauter Mean Diameter(SMD)corresponds to the smallest were selected to be analyzed.The results indicated that at a specific mass flowrate,an optimum diameter exists for the orifice,in which the orifice’s spray corresponds to the smallest and most uniform.Increases in the mass flowrate increase the optimum diameter.Further,the spray from the circular orifice is more uniform compared with that from the slot orifice with the same circumference.When the length of the orifice increases,the spray becomes larger but more uniform.The liquid regime in the orifice affects primary atomization of the liquid,significantly affecting the spray SMD and uniformity. 展开更多
关键词 slinger rotary atomization spray uniformity ORIFICE
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Spray deposition for making large size billet with swing atomizer
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作者 李建平 刘涛 +2 位作者 唐青云 韩雷 钟掘 《Journal of Central South University of Technology》 EI 2008年第3期309-312,共4页
The movement mode of the atomizer is a very important parameter during spray deposition process,which has direct influence on the size and surface texture of the billets. To resolve the problem of manufacturing large ... The movement mode of the atomizer is a very important parameter during spray deposition process,which has direct influence on the size and surface texture of the billets. To resolve the problem of manufacturing large size billets,a method of spray deposition by the atomizer with off-center swing was put forward. The atomizer was driven by the alternating current servomotor to swing within 7° at varying speed. The influence of the atomizer parameters,such as translation of the atomizer,swing angle of the atomizer,substrate falling speed and spraying pressure,on the spray deposition was studied. The optimized parameters of the spray deposition process were obtained. The results show that the large size billets with uniform surface quality can be made through adjusting swing frequency and angle of the atomizer,offset distance of the atomizer and inclined angle of the substrate; the valid spray area will decrease and the dimension of top surface will reduce when pressure is less than 0.4 MPa within certain spray distance; meantime,the moving time and cooling time of the droplets are extended,which will lead to loose structure and bad densification. When the pressure,the swing angle and the eccentric offset of the atomization equal 0.5 MPa,7° and 60 mm,respectively,large size billets with fine texture and diameter of 500 mm can be produced. 展开更多
关键词 spray deposition large size billet atomIZER swing angle eccentric offset
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