期刊文献+
共找到32篇文章
< 1 2 >
每页显示 20 50 100
漳平发电二厂水下引水钢管的浮运施工
1
作者 赵德通 《福建建筑》 1995年第1期41-42,共2页
漳平发电二厂水系统中二根φ2040×10mm水下引水钢管施工,采用引水钢管直接沉入水中,水面上采用浮箱与水下钢管相连,上浮后拖运就位的施工技术,其施工方法可行,投资少,工期快,给3^#机组提前二个投产提供了可靠的... 漳平发电二厂水系统中二根φ2040×10mm水下引水钢管施工,采用引水钢管直接沉入水中,水面上采用浮箱与水下钢管相连,上浮后拖运就位的施工技术,其施工方法可行,投资少,工期快,给3^#机组提前二个投产提供了可靠的保证。 展开更多
关键词 发电厂 引水钢管 水下钢管 工程施工 浮相
下载PDF
A novel refined dynamic model of high-speed maglev train-bridge coupled system for random vibration and running safety assessment
2
作者 MAO Jian-feng LI Dao-hang +3 位作者 YU Zhi-wu CAI Wen-feng GUO Wei ZHANG Guang-wen 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第7期2532-2544,共13页
Running safety assessment and tracking irregularity parametric sensitivity analysis of high-speed maglev train-bridge system are of great concern,especially need perfect refinement models in which all properties can b... Running safety assessment and tracking irregularity parametric sensitivity analysis of high-speed maglev train-bridge system are of great concern,especially need perfect refinement models in which all properties can be well characterized based on various stochastic excitations.A three-dimensional refined spatial random vibration analysis model of high-speed maglev train-bridge coupled system is established in this paper,in which multi-source uncertainty excitation can be considered simultaneously,and the probability density evolution method(PDEM)is adopted to reveal the system-specific uncertainty dynamic characteristic.The motion equation of the maglev vehicle model is composed of multi-rigid bodies with a total 210-degrees of freedom for each vehicle,and a refined electromagnetic force-air gap model is used to account for the interaction and coupling effect between the moving train and track beam bridges,which are directly established by using finite element method.The model is proven to be applicable by comparing with Monte Carlo simulation.By applying the proposed stochastic framework to the high maglev line,the random dynamic responses of maglev vehicles running on the bridges are studied for running safety and stability assessment.Moreover,the effects of track irregularity wavelength range under different amplitude and running speeds on the coupled system are investigated.The results show that the augmentation of train speed will move backward the sensitive wavelength interval,and track irregularity amplitude influences the response remarkably in the sensitive interval. 展开更多
关键词 maglev train-bridge interaction electromagnetic force-air gap model stochastic dynamic analysis running safety assessment probability density evolution method
下载PDF
Collision and attachment behavior between fine cassiterite particles and H_2 bubbles 被引量:16
3
作者 任浏祎 张一敏 +2 位作者 覃文庆 包申旭 王军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期520-527,共8页
Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at dif... Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at different conditions were conducted in a single bubble flotation cell. The recovery of cassiterite was found to be affected by cassiterite particle and bubble size. A matching range, in which the best recovery can be obtained, was found between particle and bubble size. Collision, attachment, and detachment of the particle-bubble were observed and captured by a high-speed camera. Particle-bubble collision and attachment were analyzed with the use of particle-bubble interaction theory to obtain the experimental results. An attachment model was introduced and verified through the photos captured by the high-speed camera. A bridge role was observed between the bubbles and particles. Particle-bubble interaction was found to be affected by bubble size and particle size, which significantly influenced not only the collision and attachment behavior of the particles and bubbles but also the flotation recovery of fine cassiterite particles. 展开更多
关键词 CASSITERITE fine particle flotation particle-bubble interaction collision and attachment
下载PDF
Electro-flotation and collision-attachment mechanism of fine cassiterite 被引量:9
4
作者 覃文庆 任浏祎 +2 位作者 王佩佩 杨聪仁 张雁生 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第4期917-924,共8页
In order to discuss the particle-bubble interaction during the electro-flotation of cassiterite,the recovery of cassiterite with different particle sizes was investigated,and the collision mechanism between the cassit... In order to discuss the particle-bubble interaction during the electro-flotation of cassiterite,the recovery of cassiterite with different particle sizes was investigated,and the collision mechanism between the cassiterite particles and H2 bubbles was explored.The flotation tests were carried out in a single bubble flotation cell.The results show that cassiterite particles 10 μm,10-20 μm,20?38 μm and 38-74 μm match with bubbles with size of 50-150 μm,about 250 μm,74 μm and 74 μm,respectively,and a better recovery can be obtained.It is demonstrated that the recovery of cassiterite is influenced by the size of cassiterite particles and bubbles.Furthermore,the probabilities of collision,adhesion,detachment and collection were calculated using the collision,attachment and collection models.Theoretical calculation results show that the collision probability decreases sharply with decreasing particle size and increasing bubble size(below 150 μm).The attachment probability would increase from the effective collision,leading to the increase of recovery. 展开更多
关键词 CASSITERITE particle-bubble interaction fine particle flotation ELECTRO-FLOTATION collision-attachment probability
下载PDF
Flotation of kaolinite and diaspore with hexadecyl dimethyl benzyl ammonium chloride 被引量:5
5
作者 胡岳华 欧阳魁 +1 位作者 曹学锋 张丽敏 《Journal of Central South University of Technology》 EI 2008年第3期378-381,共4页
Tertiary amine was synthesized from fatty amine and formaldehyde. And then the synthesized tertiary amine was used to react with benzyl chloride to synthesize hexadecyl dimethyl benzyl ammonium chloride (1627) at ambi... Tertiary amine was synthesized from fatty amine and formaldehyde. And then the synthesized tertiary amine was used to react with benzyl chloride to synthesize hexadecyl dimethyl benzyl ammonium chloride (1627) at ambient pressure. Using the synthesized 1627 as collector,the flotation properties of diaspore and kaolinite were investigated by single mineral and mixed mineral test. The flotation mechanism of diaspore,kaolinite and 1627 was discussed based on FTIR spectra. The results show that the mass ratio of aluminum to silicate achieves 15.02 and the recovery of alumina in concentrate is 43.07% using 1627 as a collector. The 1627 is found to be a more effective and a promising collector for reverse flotation to remove aluminum-silicate minerals from bauxite. 展开更多
关键词 KAOLINITE DIASPORE hexadecyl dimethyl benzyl ammonium chloride dodecyl amine reverse floatation infra-red spectrum
下载PDF
Numerical Simulation and Analysis of Gas Flow Field in Serrated Valve Column 被引量:12
6
作者 王良华 崔觉剑 姚克俭 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第4期541-546,共6页
A three-dimensional computational fluid dynamics (CFD) model for gas flow through a serrated valve tray was presented. The flow field, as well as the dry-pressure drop of the valve under the full-opening condition w... A three-dimensional computational fluid dynamics (CFD) model for gas flow through a serrated valve tray was presented. The flow field, as well as the dry-pressure drop of the valve under the full-opening condition was simulated based on the proposed model by using FLUENT 6.0 software. Compared with the values of dry-pressure dro.p in different turbulent models, the.simulated.results using RNG κ-ε model are in reasonable agreement with experimental data, indicating that RNG κ-ε model is suitable in simulating gas flow through the serrated valve tray. Then the CFD model combining RNG κ-ε model was used to study the three-dimensional gas flow through the considered serrated valve tray. The simulated results showed that various eddies existed on the serrated valve tray, and both the eddy and the non-eddy areas were nearly equal. The existence of addendum can decrease the eddy area caused by gas passing through the lateral outlet slots. The size of eddies can be reduced by optimizing the distance between valves. 展开更多
关键词 serrated valve numerical simulation pressure drop RNG κ-ε turbulent model
下载PDF
Rapid solidification of Cu_(60)Co_(30)Cr_(10) alloy under different conditions 被引量:2
7
作者 郭晋波 曹崇德 +6 位作者 弓素莲 宋瑞波 白晓军 王建元 郑建邦 文喜星 孙占波 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第3期731-734,共4页
Metastable liquid phase separation and rapid solidification in a metastable miscibility gap were investigated on the Cu60Co30Cr10 alloy by using the electromagnetic levitation and splat-quenching.It is found that the ... Metastable liquid phase separation and rapid solidification in a metastable miscibility gap were investigated on the Cu60Co30Cr10 alloy by using the electromagnetic levitation and splat-quenching.It is found that the alloy generally has a microstructure consisting of a(Co,Cr)-rich phase embedded in a Cu-rich matrix,and the morphology and size of the(Co,Cr)-rich phase vary drastically with cooling rate.During the electromagnetic levitation solidification processing the cooling rate is lower,resulting in an obvious coalescence tendency of the(Co,Cr)-rich spheroids.The(Co,Cr)-rich phase shows dendrites and coarse spheroids at lower cooling rates.In the splat quenched samples the(Co,Cr)-rich phase spheres were refined significantly and no dendrites were observed.This is probably due to the higher cooling rate,undercooling and interface tension. 展开更多
关键词 Cu-Co-Cr alloy rapid solidification metastable liquid phase separation electromagnetic levitation splat-quenching
下载PDF
Research on the rheological properties of pesticide suspension concentrate 被引量:2
8
作者 潭成侠 沈德隆 +3 位作者 翁建全 陈庆悟 刘会君 袁其亮 《Journal of Zhejiang University Science》 EI CSCD 2004年第12期1604-1607,共4页
This study reports research on pesticide suspension rheology and a new rheological parameter, the relative value of approach, which has great advantage for judging the physical stability of a pesticide suspension conc... This study reports research on pesticide suspension rheology and a new rheological parameter, the relative value of approach, which has great advantage for judging the physical stability of a pesticide suspension concentrate. Experiments showed that the system can form stable dispersions when the value of the relative value of approach (Sr) is less than 0.1. 展开更多
关键词 Suspension concentrate RHEOLOGY STABILITY Relative value of approach
下载PDF
Effect of Charge, Size and Temperature on Stability of Charged Colloidal Nano Particles 被引量:1
9
作者 A.Golchoobi A.Khosravi +1 位作者 H.Modarress A.Ahmadzadeh 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2012年第5期617-624,I0004,共9页
Molecular simulation of charged colloidal suspension is performed in NVT canonical ensemble using Monte Carlo method and primitive model. The well-known Derjaguin-Landau-Verwey- Overbeek theory is applied to account f... Molecular simulation of charged colloidal suspension is performed in NVT canonical ensemble using Monte Carlo method and primitive model. The well-known Derjaguin-Landau-Verwey- Overbeek theory is applied to account for effective interactions between particles. Effect of temperature, valance of micro-ions and the size of colloidal particles on the phase stability of the solution is investigated. The results indicate that the suspension is more stable at higher temperatures. On the other hand, for a more stable suspension to exist, lower micro- ion valance is favorable. For micro-ions of higher charge the number of aggregates and the number of particle in each of aggregate on average is higher. However for the best of our results larger colloidal particle are less stable. Comparing the results with theoretical formula considering the influence of surface curvature shows qualitative consistency. 展开更多
关键词 Simulation COAGULATION Colloidal phenomenon STABILITY Electrostatic force Dispersion force
下载PDF
Effect of serpentine and sodium hexametaphosphate on ascharite flotation 被引量:3
10
作者 Zhi-hang LI Yue-xin HAN +1 位作者 Yan-jun LI Peng GAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第8期1841-1848,共8页
Sodium hexametaphosphate(SHMP)was used to minimize the adverse effect of serpentine for improving aschariterecovery.The effects of particle size and content of SHMP,and serpentine on ascharite flotation process were i... Sodium hexametaphosphate(SHMP)was used to minimize the adverse effect of serpentine for improving aschariterecovery.The effects of particle size and content of SHMP,and serpentine on ascharite flotation process were investigated throughflotation,zeta potential tests,FT-IR analysis,XPS analysis and DLVO theory.Particles interaction and mechanism of SHMP werealso discussed.It was found that aggregation between serpentine and ascharite particles easily happened,and the particle size ofserpentine had a profound impact on the ascharite recovery.In particular,the fine serpentine with size less than38μm had thegreatest contribution to the deterioration of ascharite flotation performance.After SHMP treatment,the adverse effect of serpentinewas significantly reduced.The mechanism of SHMP showed that it could alter the surface charges of serpentine and ascharite toprevent severe interparticle aggregation,which resulted in a well-dispersed pulp and benefited ascharite flotation process.Theadsorption of SHMP on serpentine was due to hydrogen bonding and chemical adsorption,resulting in the formation of complex onserpentine surface to decrease its floatability. 展开更多
关键词 SERPENTINE ASCHARITE sodium hexametaphosphate FLOTATION DLVO theory INTERACTION ADSORPTION
下载PDF
Mechanism of microwave assisted suspension magnetization roasting of oolitic hematite ore 被引量:7
11
作者 ZHOU Wen-tao SUN Yong-sheng +2 位作者 HAN Yue-xin GAO Peng LI Yan-jun 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期420-432,共13页
Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roa... Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize the ore.The results showed that under the conditions of microwave pretreatment temperature of 1050℃ for 2 min,a magnetic concentrate with an iron grade of 58.72%at a recovery of 89.32%was obtained by microwave suspension magnetization roasting and magnetic separation.Moreover,compared with the no microwave pretreatment case,the iron grade and recovery increased by 3.17%and 1.58%,respectively.Microwave pretreatment increased the saturation magnetization of the roasted products from 24.974 to 39.236(A∙m^(2))/kg and the saturation susceptibility from 0.179×10^(−3) m^(3)/kg to 0.283×10^(−3) m^(3)/kg.Microcracks were formed between the iron and gangue minerals,and they gradually extended to the core of oolite with the increase in the pretreatment time.The reducing gas diffused from outside to inside along the microcracks,which promoted the selective transformation of the weak magnetic hematite into the strong magnetic magnetite. 展开更多
关键词 oolitic hematite MICROWAVE suspension magnetization roasting phase and magnetic transformation microstructure evolution
下载PDF
Design of relative position sensing system for high-speed maglev train
12
作者 钱存元 Han Zhengzhi +1 位作者 Xie Weida Shao Derong 《High Technology Letters》 EI CAS 2008年第1期18-23,共6页
In the high-speed maglev system,accurate real-time information of the train position is essential forstable,safe and efficient train operation.To detect the relative position of the high-speed maglev trainfrom a refer... In the high-speed maglev system,accurate real-time information of the train position is essential forstable,safe and efficient train operation.To detect the relative position of the high-speed maglev trainfrom a reference position,a location method based on long stator slot detection was proposed.Besides,aprototype system has been successfully developed.The hardware structure of the system,as well as itsworking principle was described.Moreover,a subdivision algorithm for calculating the pole location anglesignal was elucidated.Experiments show that the proposed method is feasible.The technical indexes ofthe detection system satisfy the requirements of the vehicle operation control system.The relative positionsensing system can be put into practice. 展开更多
关键词 MAGLEV relative position linear synchronous motor SUBDIVISION
下载PDF
A Numerical Sirnulation of Gas-Particle Two-Phase Flow in a Suspension Bed Using DifFusion Flux Model 被引量:1
13
作者 尚智 杨瑞昌 +2 位作者 FUKUDA Kenji 钟勇 巨泽建 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第5期497-503,共7页
A mathematical modei of two-dimensional turbulent gas-particle twophase flow based on the modified diffusion flux modei (DFM) and a numerical simulation method to analyze the gas-particle flow structures are developed... A mathematical modei of two-dimensional turbulent gas-particle twophase flow based on the modified diffusion flux modei (DFM) and a numerical simulation method to analyze the gas-particle flow structures are developed. The modified diffusion flux modei, in which the acceleration due to various forces is taken into account for the calculation of the diffusion velocity of particles, is applicable to the analysis of multi-dimensional gas-particle two-phase turbulent flow. In order to verify its accuracy and efficiency, the numerical simulation by DFM is compared with experimental studies and the prediction by k-ε-kp two-fluid modei, which shows a reasonable agreement. It is confirmed that the modified diffusion flux modei is suitable for simulating the multi-dimensional gas-particle two-phase flow. 展开更多
关键词 diffusion flux model gas-solid two-phase flow turbulent flow numerical simulation
下载PDF
Spatial and temporal variations of Synechococcus and picoeukaryotes in the Taiwan Strait,China 被引量:2
14
作者 黄邦钦 林学举 洪华生 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2009年第1期22-30,共9页
The size-fractionated phytoplankton biomass, and the spatial and temporal variations in abundance of Synechococcus (SYN) and picoeukaryotes (PEUK) were measured in the Taiwan Strait during three cruises (August 1997, ... The size-fractionated phytoplankton biomass, and the spatial and temporal variations in abundance of Synechococcus (SYN) and picoeukaryotes (PEUK) were measured in the Taiwan Strait during three cruises (August 1997, February-March 1998, and August 1998). The results show that picophytoplankton and nanophytoplankton dominate the phytoplankton biomass, in average of 38% and 40%, respectively. SYN and PEUK varied over time in abundance and carbon biomass, greater in summer than in winter, in range of (7.70–209.2)×106 and (0.75–15.4)×106 cells/cm2 in the abundance, and 1.93–52.3 and 1.57–32.4 μgC/cm2 in the carbon biomass, for SYN and PEUK, respectively. The horizontal distributions of both groups were diurnal but heterogeneous in abundance, depending on the groups and layer of depths. Temperature is the key controlling factor for picophytoplankton distribution (especially in winter) in the Strait. 展开更多
关键词 SYNECHOCOCCUS PICOEUKARYOTES PICOPHYTOPLANKTON spatial and temporal variations theTaiwan Strait
下载PDF
Saturation influence of control voltage on maglev stationary self-excited vibration 被引量:3
15
作者 李金辉 李杰 余佩倡 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期1954-1960,共7页
This work addresses the saturation influence of control voltage on the occurring of self-excited vibration of maglev vehicle-bridge interaction system, which greatly degrades the stability of the levitation control, d... This work addresses the saturation influence of control voltage on the occurring of self-excited vibration of maglev vehicle-bridge interaction system, which greatly degrades the stability of the levitation control, decreases the ride comfort, and restricts the cost of the whole system. Firstly, the interaction model of vehicle-bridge system is developed. Based on the interaction model, the relationship between the control voltage and vibration frequency is solved. Then, the variation of the effective direct component and fundamental harmonic are discussed. Furthermore, from the perspective of energy transmission between the levitation system and bridge, the principle underlying the self-excited vibration is explored, and the influence on the stability is discussed. Finally, in terms of the variation of the characteristic roots, the influence is analyzed further and some conclusions are obtained. This study provides a theoretical guidance for mastering the self-excited vibration problems. 展开更多
关键词 MAGLEV LEVITATION SATURATION self-excited vibration
下载PDF
Study on the Axial Dispersion of Liquid in Column Flotation
16
作者 周鹍 曾爱武 +1 位作者 高长宝 余国琮 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第4期477-479,共3页
An experimental study on the axial dispersion of liquid was carried out in a 0.382-m-ID flotation column packed with different structured packings or free of packings. The correlations of axial Peclet numbers with the... An experimental study on the axial dispersion of liquid was carried out in a 0.382-m-ID flotation column packed with different structured packings or free of packings. The correlations of axial Peclet numbers with the liquid and gas superficial Reynolds numbers were developed for various packings. Among the packings tested, it is found that in the column packed with 250Y or 350Y packings the axial dispersion is the lowest. The addition of frother can decrease the axial dispersion. By the simulation analysis of the one-dimension dispersion model of packed flotation column, it is found that small axial dispersion, high collection rate constant and low axial liquid velocity can increase the collection zone recovery. 展开更多
关键词 packed flotation column flotation column numerical analysis mineral processing
下载PDF
Reliability of gas holdup measurements using the differential pressure method in a cyclone-static micro-bubble flotation column 被引量:1
17
作者 Xia Wencheng Yang Jianguo Wang Yuling 《Mining Science and Technology》 EI CAS 2011年第6期797-801,共5页
Gas holdup is one of the key parameters in flotation process. Gas holdup as measured by a differential pressure method was investigated and the relative errors compared to the average gas holdup from the volume expans... Gas holdup is one of the key parameters in flotation process. Gas holdup as measured by a differential pressure method was investigated and the relative errors compared to the average gas holdup from the volume expansion method. The errors were used to establish optimum measurement positions. The results show that the measurement position should be in the middle of the column and in the region half way from the center to the wall (the half-radius). The gas holdup along the axial direction is lower at the bottom and higher at the top of the floatation column. The gas holdup along the radial direction is lower near the wall and higher near the center of the flotation column. The average gas holdup measure- ment can be replaced by regional gas holdup values. 展开更多
关键词 Gas holdup distribution Differential pressure method Measurement positions Axial direction Radial direction
下载PDF
Adsorption of ^133Cs and ^87Sr on pumice tuff:A comparative study between powder and intact solid phase 被引量:1
18
作者 Mohammad Rajib Chiaki T.Oguchi 《Acta Geochimica》 EI CAS CSCD 2017年第2期224-231,共8页
This study examines the use of intact samples as an alternative to powder in conventional batch sorption studies to determine the distribution coefficient(K_d).Stable cesium(^(133)Cs) and strontium(^(87)Sr) were used ... This study examines the use of intact samples as an alternative to powder in conventional batch sorption studies to determine the distribution coefficient(K_d).Stable cesium(^(133)Cs) and strontium(^(87)Sr) were used under specified geochemical conditions to compare the Kdvalues of powder and block pumice tuff samples. The aim of the study was to infer any Kddifference under laboratory and field conditions. Kdvalues for block samples were found to be less than one order of magnitude lower than powder materials for both Cs and Sr on fresh tuff, and more than one order of magnitude lower in oxidized tuff. Destruction of micropores in oxidized tuff was estimated to be mainly responsible for reducing Kdvalues in oxidized tuff. However, approximately one order of magnitude difference in Kdvalues indicates that homogenously prepared intact samples can be used for sorption coefficient measurement at closer to in situ conditions. Pore size distribution analysis using mercury intrusion porosimetry revealed that lower Kdvalues on block samples result from lower surface area available as sorption sites due to inaccessible closed pores in the intact solid. 展开更多
关键词 CESIUM STRONTIUM Pumice tuff ADSORPTION
下载PDF
Solutions to Buoyancy-Drag Equation for Dynamical Evolution of Rayleigh-Taylor and Richtmyer-Meshkov Mixing Zone
19
作者 W.K.Chow N.K.Fong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第10期751-755,共5页
With a self-similar parameter b(At) = Hi/λi, where At is the Atwood number, Hi and λi are the a.mplluae and wavelength of bubble (i = 1) and spike (i = 2) respectively, we derive analytically the solutions to ... With a self-similar parameter b(At) = Hi/λi, where At is the Atwood number, Hi and λi are the a.mplluae and wavelength of bubble (i = 1) and spike (i = 2) respectively, we derive analytically the solutions to the buoyancy-drag equation recently proposed for dynamical evolution of Rayleigh-Taylor and Richtmyer-Meshkov mixing zone. Numerical solutions are obtained with a simple form ofb(At)--- 1/(1 + At) and comparisons with recent LEM (linear electric motor) experiments are made, and an agreement is found with properly chosen initial conditions. 展开更多
关键词 Buoyancy-Drag equation Rayleigh Taylor mixing Richtmyer Meshkov mixing
下载PDF
Effect of particle loading on heat transfer enhancement in a gas-solid suspension cross flow 被引量:1
20
作者 周劲松 骆仲泱 +2 位作者 高翔 倪明江 岑可法 《Journal of Zhejiang University Science》 CSCD 2002年第4期381-386,共6页
Heat transfer between gas-solid multiphase flow and tubes occurs in many industry processes, such as circulating fluidized bed process, pneumatic conveying process, chemical process, drying process, etc. This paper fo... Heat transfer between gas-solid multiphase flow and tubes occurs in many industry processes, such as circulating fluidized bed process, pneumatic conveying process, chemical process, drying process, etc. This paper focuses on the influence of the presence of particles on the heat transfer between a tube and gas-solid suspension. The presence of particles causes positive enhancement of heat transfer in the case of high solid loading ratio, but heat transfer reduction has been found for in the case of very low solid loading ratio (M s of less than 0.05 kg/kg). A useful correlation incorporating solid loading ratio, particle size and flow Reynolds number was derived from experimental data. In addition, the k-ε two-equation model and the Fluctuation-Spectrum- Random-Trajectory Model (FSRT Model) are used to simulate the flow field and heat transfer of the gas-phase and the solid-phase, respectively. Through coupling of the two phases the model can predict the local and total heat transfer characteristics of tube in gas-solid cross flow. For the total heat transfer enhancement due to particles loading the model predictions agreed well with experimental data. 展开更多
关键词 Multiphase flow Heat transfer Particle loading
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部