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Effect of tool rotational speed on the particle distribution in friction stir welding of AA6092/17.5 SiCp-T6 composite plates and its consequences on the mechanical property of the joint 被引量:2
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作者 Uttam Acharya Barnik Saha Roy Subhash Chandra Saha 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2020年第2期381-391,共11页
This study investigates the effect of tool rotational speed(TRS)on particle distribution in nugget zone(NZ)through quantitative approach and its consequences on the mechanical property of friction stir welded joints o... This study investigates the effect of tool rotational speed(TRS)on particle distribution in nugget zone(NZ)through quantitative approach and its consequences on the mechanical property of friction stir welded joints of AA6092/17.5 SiCp-T6 composite.6 mm thick plates are welded at a constant tool tilt angle of 2°and tool traverse speed of 1 mm/s by varying the TRS at 1000 rpm,1500 rpm and 2000 rpm with a taper pin profiled tool.Microstructure analysis shows large quantity of uniformly shaped smaller size SiC particle with lower average particle area which are homogeneously distributed in the NZ.The fragmentation of bigger size particles has been observed because of abrading action of the hard tool and resulting shearing effect and severe stress generation due to the rotation of tool.The particles occupy maximum area in the matrix compared to that of the base material(BM)due to the redistribution of broken particles as an effect of TRS.The migration of particles towards the TMAZ-NZ transition zone has been also encountered at higher TRS(2000 rpm).The microhardness analysis depicts variation in average hardness from top to bottom of the NZ,minimum for 1500 rpm and maximum for 2000 rpm.The impact strength at 1000 rpm and 1500 rpm remains close to that of BM(21.6 J)while 2000 rpm shows the accountable reduction.The maximum joint efficiency has been achieved at 1500 rpm(84%)and minimum at 1000 rpm(68%)under tensile loading.Fractographic analysis shows mixed mode of failure for BM,1000 rpm and 1500 rpm,whereas 2000 rpm shows the brittle mode of failure. 展开更多
关键词 Friction STIR welding Aluminium matrix composite TOOL rotational speed Particle distribution Mechanical property
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UV Photolysis of N2O Isotopomers: Isotopic Fractionations and Product Rotational Quantum State Distributions
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作者 Mohammad Noh Daud 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2011年第6期679-685,I0003,共8页
The time-dependent quantum wave packet method is used to study the dynamics of the pho- todissociation processes for the isotopomers 14N14N16O, 14N15N16O, 15N14N16O, 15N15N16O, 14N14N17O, and 14N14N18O. In general, th... The time-dependent quantum wave packet method is used to study the dynamics of the pho- todissociation processes for the isotopomers 14N14N16O, 14N15N16O, 15N14N16O, 15N15N16O, 14N14N17O, and 14N14N18O. In general, the computed isotopic fractionation factors derived from the absorption cross sections of five heavy isotopomers are in good agreement with the experimental results. Relative to the 14NI4N16O isotopomer, the N2 rotational state distributions for the isotopically nitrogen substituted N2O are found to be entirely shifted to higher rotational states. Similar to its isotopic fractionation factors, the N2 rotational state distributions for the asymmetric isotopomers 14N15N16O and 15N14N16O are found to be observably different. 展开更多
关键词 Time-dependent wavepacket Isotopic fractionation Product rotational distribution
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SIZE DISTRIBUTION OF DROPLETS ABOVE A ROTATING STREAM TRAY AND MODEL OF DROPLET MOTION THEREIN 被引量:1
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作者 陈建孟 谭天恩 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 1997年第2期35-42,共8页
Droplet size distributions have been investigated with a two-probe system above a rotatingstream tray of 300 mm diameter.The measured distributions are found to follow the upper limitedlognormal distribution with thre... Droplet size distributions have been investigated with a two-probe system above a rotatingstream tray of 300 mm diameter.The measured distributions are found to follow the upper limitedlognormal distribution with three parameters dependent primarily on gas hole F-factor.A probabilitymethod is used to describe the initial state of the droplet population above the tray,and a model fordroplet motion is presented.The results computed with model agree well with experimental data. 展开更多
关键词 rotatING STREAM TRAY DROPLET size distribution model for DROPLET MOTION
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Recurrent neural network decoding of rotated surface codes based on distributed strategy
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作者 李帆 李熬庆 +1 位作者 甘启迪 马鸿洋 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期322-330,共9页
Quantum error correction is a crucial technology for realizing quantum computers.These computers achieve faulttolerant quantum computing by detecting and correcting errors using decoding algorithms.Quantum error corre... Quantum error correction is a crucial technology for realizing quantum computers.These computers achieve faulttolerant quantum computing by detecting and correcting errors using decoding algorithms.Quantum error correction using neural network-based machine learning methods is a promising approach that is adapted to physical systems without the need to build noise models.In this paper,we use a distributed decoding strategy,which effectively alleviates the problem of exponential growth of the training set required for neural networks as the code distance of quantum error-correcting codes increases.Our decoding algorithm is based on renormalization group decoding and recurrent neural network decoder.The recurrent neural network is trained through the ResNet architecture to improve its decoding accuracy.Then we test the decoding performance of our distributed strategy decoder,recurrent neural network decoder,and the classic minimum weight perfect matching(MWPM)decoder for rotated surface codes with different code distances under the circuit noise model,the thresholds of these three decoders are about 0.0052,0.0051,and 0.0049,respectively.Our results demonstrate that the distributed strategy decoder outperforms the other two decoders,achieving approximately a 5%improvement in decoding efficiency compared to the MWPM decoder and approximately a 2%improvement compared to the recurrent neural network decoder. 展开更多
关键词 quantum error correction rotated surface code recurrent neural network distributed strategy
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DISTRIBUTION OF ACTIVE EARTH PRESSURE OF RETAINING WALL WITH WALL MOVEMENT OF ROTATION ABOUT TOP 被引量:1
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作者 王元战 唐照评 郑斌 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第7期761-767,共7页
Based on the Coulomb's theory that the earth pressure against the back of a retaining wall is due to the thrust exerted by the sliding wedge of soil from the back of the wall to a plane which passes through the bo... Based on the Coulomb's theory that the earth pressure against the back of a retaining wall is due to the thrust exerted by the sliding wedge of soil from the back of the wall to a plane which passes through the bottom edge of the wall and has an inclination equal to the angle of θ, the theoretical answers to the unit earth pressure, the resultant earth pressure and the point of application of the resultant earth pressure on a retaining wall were obtained for the wall movement mode of rotation about top. The comparisons were made among the formula presented here, the formula for the wall movement mode of translation, the Coulomb's formula and some experimental observations. It is demonstrated that the magnitudes of the resultant earth pressures for the wall movement mode of rotation about top is equal to that determined by the formula for the wall movement mode of translation and the Coulomb's theory. But the distribution of the earth pressure and the points of application of the resultant earth pressures have significant difference. 展开更多
关键词 retaining wall rotation about top active earth pressure distribution point of application
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Carbon Accumulation and Distribution in Ecosystems of Taiwania flousiana Plantation and Successive Rotation Plantation of Cunninghamia lanceolata 被引量:2
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作者 Zhou Gang He Bin +3 位作者 Wei Jiaguo Liu Fansheng Mo Shaozhuang Yang Zhengwen 《Meteorological and Environmental Research》 CAS 2018年第4期11-14,18,共5页
The 23-year-old T. flousiana plantation and successive rotation plantation of C. lanceolata at Shankou Forest Farm of Nandan County, Guangxi were tested by the method of plot investigation combining with biomass m... The 23-year-old T. flousiana plantation and successive rotation plantation of C. lanceolata at Shankou Forest Farm of Nandan County, Guangxi were tested by the method of plot investigation combining with biomass measurement. Carbon storage and spatial distribution of different components in the two forests were analyzed. The results indicated that carbon content in different organs of T. flousiana ranged from 426.0 to 503.9 g/kg, and the order was bark 〉stem 〉 root 〉 branch 〉 leaf. The carbon contents in shrub, herb and litter layers were452.9 , 408.0 and 428.9 g/kg, respectively. Carbon content in the soil (0 -80 cm)was 16.59 g/kg. The carbon content in different organs of C. lanceolata ranged from 464.5 to 508.9 g/kg, and the order was bark 〉 stem 〉 branch 〉 root 〉 leaf. The carbon contents in shrub, herb and litter layers were 456.2, 416.3 and 468.1 g/kg, respectively. Carbon content in the soil (0 -80 cm)was 15.77 g/kg. Total carbon storage amounts of T. flousiana plantation and successive rotation plantation of C. lanceolata were 245.83 and 213.52 t/hm^2, respectively. The carbon storage order of different structure layers from T. flousiana plantation and successive rotation plantation of C. lanceolata was soil layer (0 -8 0 cm) 〉 vegetation layer 〉 litter layer. Annual net productivity in the arbor layers of T. flousiana plantation and successive rotation plantation of C. lanceolata plantations was 10.75 and 17.13 t/(hm^2 · a) ; annual net carbon fixation amounts were estimated as 5.05 and 3.47 t /(hm^2 · a) ; annual net absorption C02 amounts were 18.53 and 12.73 t/(hm^2 · a) respectively. 展开更多
关键词 T. flousiana C. lanceolata Successive rotation Carbon storage Carbon distribution
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Simulation and experiment of six-bed PSA process for air separation with rotating distribution valve 被引量:1
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作者 Tao Tian Yayan Wang +6 位作者 Bing Liu Zhaoyang Ding Xinxi Xu Meisheng Shi Jun Ma Yanjun Zhang Donghui Zhang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第2期329-337,共9页
In this work,a six-bed pressure swing adsorption(PSA)process was investigated to produce medical oxygen from air,which uses the combination of six-way rotating distribution valve and PSA and has the main advantage of ... In this work,a six-bed pressure swing adsorption(PSA)process was investigated to produce medical oxygen from air,which uses the combination of six-way rotating distribution valve and PSA and has the main advantage of effectively saving space compared to the traditional two-bed or four-bed PSA process and can obtain greater productivity.The mathematical model of adsorption beds was developed based on the separation mechanism and the interaction among different equipment.Moreover,a pilot-scale device has been constructed to verify the accuracy of mathematical model by experiment.The oxygen product conformed to the medical standard(>93%(vol))with a recovery of over 57%.Some related parameters were also discussed in detail,such as step time,ratio of length to the diameter,flow rate of product. 展开更多
关键词 Pressure swing adsorption Air separation Mathematical modeling rotating distribution valve
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Thickness distribution of large scale metallic sheet by EB-PVD on rotating substrate
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作者 单英春 赫晓东 +1 位作者 李明伟 李垚 《中国有色金属学会会刊:英文版》 CSCD 2005年第S3期232-235,共4页
A two-dimensional kinetic Monte-Carlo(KMC) method was used to approach the thickness distribution of large scale metallic sheet deposited by electron beam physical vapor deposition(EB-PVD) on rotating substrate. The K... A two-dimensional kinetic Monte-Carlo(KMC) method was used to approach the thickness distribution of large scale metallic sheet deposited by electron beam physical vapor deposition(EB-PVD) on rotating substrate. The KMC model involves incident atom attachment, adatom diffusion and adatom detachment. The effective deposition rate and effective incident angle along substrate radial were studied as influencing factors of sheet thickness distribution. The KMC simulation results indicate that incident angle is a very important factor to affect the sheet thickness distribution as well as theory deposition mass. The experiments results show that the KMC model can predict the thickness distribution of large scale sheet deposited by EB-PVD on rotating substrate. 展开更多
关键词 thickness distribution large scale METALLIC SHEET KINETIC Monte-Carlo method rotatING SUBSTRATE electric beam physical vapor deposition(EB-PVD)
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Intercept-resend attack on six-state quantum key distribution over collective-rotation noise channels
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作者 Kevin Garapo Mhlambululi Mafu Francesco Petruccione 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期131-137,共7页
We investigate the effect of collective-rotation noise on the security of the six-state quantum key distribution. We study the case where the eavesdropper, Eve, performs an intercept-resend attack on the quantum commu... We investigate the effect of collective-rotation noise on the security of the six-state quantum key distribution. We study the case where the eavesdropper, Eve, performs an intercept-resend attack on the quantum communication between Alice, the sender, and Bob, the receiver. We first derive the collective-rotation noise model for the six-state protocol and then parameterize the mutual information between Alice and Eve. We then derive quantum bit error rate for three interceptresend attack scenarios. We observe that the six-state protocol is robust against intercept-resend attacks on collective rotation noise channels when the rotation angle is kept within certain bounds. 展开更多
关键词 six states quantum key distribution security collective-rotation noise
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Distribution patterns of rock mass displacement in deeply buried areas induced by active fault creep slip at engineering scale 被引量:9
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作者 ZHANG Chuan-qing LIU Xiao-yan +3 位作者 ZHU Guo-jin ZHOU Hui ZHU Yong WANG Chao 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第10期2849-2863,共15页
Active fault creep slip induces deformation of rock mass buried deeply in fault zones that significantly affect the operational safety of long linear projects passing through it.Displacement distribution patterns of r... Active fault creep slip induces deformation of rock mass buried deeply in fault zones that significantly affect the operational safety of long linear projects passing through it.Displacement distribution patterns of rock masses in active fault zones which have been investigated previously are the key design basis for such projects.Therefore,a discrete element numerical model with different fault types,slip time,dip angles,and complex geological features was established,and then the creep slip for normal,reverse,and strike-slip faults were simulated to analyze the displacement distribution in the fault rock mass.A disk rotation test system and the corresponding laboratory test method were developed for simulating rock mass displacement induced by creep slippage of faults.A series of rotation tests for softand hard-layered specimens under combined compression and torsional stress were conducted to verify the numerical results and analyze the factors influencing the displacement distribution.An S-shaped displacement distribution independent of fault dip angle was identified corresponding to reverse,normal,and strike-slip faults.The results indicated that the higher the degree of horizontal extrusion,the softer the rock mass at the fault core,and the higher the degree of displacement concentration in the fault core;about 70%of the creep slip displacement occurs within this zone under 100 years of creep slippage. 展开更多
关键词 active faults creep slip displacement distribution patterns discrete element rotation test
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Influence of Processing Parameters on Granularity Distribution of Superalloy Powders during PREP 被引量:2
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作者 HuanmingCHEN BenfuHU +2 位作者 YiwenZHANG HuiyingLI QuanmaoYU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第6期587-590,共4页
In order to investigate the influence of processing parameters on the granularity distribution of superalloy powders during the atomization of plasma rotating electrode processing (PREP), in this paper FGH95 superallo... In order to investigate the influence of processing parameters on the granularity distribution of superalloy powders during the atomization of plasma rotating electrode processing (PREP), in this paper FGH95 superalloy powders is prepared under different processing conditions by PREP and the influence of PREP processing parameters on the granularity distribution of FGH95 superalloy powders is discussed based on fractal geometry theory. The results show that with the increase of rotating velocity of the self-consuming electrode, the fractal dimension of the granularity distribution increases linearly, which results in the increase of the proportion of smaller powders. The change of interval between plasma gun and the self-consuming electrode has a little effect on the granularity distribution, also the fractal dimension of the granularity distribution changed a little correspondingly. 展开更多
关键词 FGH95 superalloy powders Granularity distribution Plasma rotating electrode processing (PREP) Fractal dimension
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DISTRIBUTION LAW OF RANDOM UNBALANCE RESPONSE OF MULTISTAGE BLOWER
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作者 Tan, Qing Zhong, Jue 《中国有色金属学会会刊:英文版》 EI CSCD 1998年第1期165-168,共4页
DISTRIBUTIONLAWOFRANDOMUNBALANCERESPONSEOFMULTISTAGEBLOWER①TanQingandZhongJueColegeofMechanicalandElectrical... DISTRIBUTIONLAWOFRANDOMUNBALANCERESPONSEOFMULTISTAGEBLOWER①TanQingandZhongJueColegeofMechanicalandElectricalEnginering,Centra... 展开更多
关键词 UNBALANCE distribution RANDOM experiment method vibration RESPONSE CENTRIFUGAL BLOWER overcritical rotating speed autobalance technology working condition diagnosis
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Photoelectron momentum distributions of single-photon ionization under a pair of elliptically polarized attosecond laser pulses
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作者 Hui-Fang Cui Xiang-Yang Miao 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第7期313-320,共8页
The attosecond ionization dynamics of atoms has attracted extensive attention in these days.However,the role of the initial state is not clearly understood.To address this question,we perform simulations on the neon a... The attosecond ionization dynamics of atoms has attracted extensive attention in these days.However,the role of the initial state is not clearly understood.To address this question,we perform simulations on the neon atom and its model atom with different initial states by numerically solving the corresponding two-dimensional time-dependent Schrodinger¨equations.We theoretically investigate atomic photoelectron momentum distributions(PMDs)by a pair of elliptically polarized attosecond laser pulses.We find that the PMD is sensitive not only to the ellipticities of the pulses,the relative helicity,and time delay of the pulses,but also to the symmetry of the initial electronic states.Results are analyzed by the first-order time-dependent perturbation theory(TDPT)and offer a new tool for detecting the rotation direction of the ring currents. 展开更多
关键词 photoelectron momentum distributions elliptically polarized attosecond laser pulses magnetic quantum numbers rotation direction of the ring currents
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Distribution of oxide inclusions in H13 castings under super-gravity field with multi-stage rotation speeds
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作者 Shao-ying Li Xiao-jun Xi +2 位作者 Xing-ming Zhao Han-jie Guo Jing Guo 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第1期121-133,共13页
The 42 kg industrial H13 castings were prepared by different super-gravity fields with multi-rotation speeds,and the distribution of oxide inclusions in the castings was studied.In addition,the inward movement Reynold... The 42 kg industrial H13 castings were prepared by different super-gravity fields with multi-rotation speeds,and the distribution of oxide inclusions in the castings was studied.In addition,the inward movement Reynolds number and inward movement time of oxide inclusions as well as the solidification time of molten steel at different positions in the castings were calculated to clarify the removal mechanism of oxide inclusions in super-gravity field.The results show that the large size(i.e.,greater than 10μm)oxide inclusions are mainly concentrated in the inner and outer parts of the super-gravity castings with constant rotation speed(500 r min^(-1))and five-stage rotation speeds(500,600,750,850,and 950 r min^(-1)),respectively,while there are no large oxide inclusions in the super-gravity castings with three-stage rotation speeds(500,600,and 750 r min^(-1)).Although an increase in the particle size of inclusion and the rotation speed in super-gravity field is conducive to the increase in the inward movement Reynolds number of oxide inclusions and reduction in the inward movement time of oxide inclusions,it will reduce the local solidification time of molten steel.In the range of the rotation speed studied,the super-gravity field with three-stage rotation speeds has the best effect on the removal of inclusions in H13 molten steel. 展开更多
关键词 distribution Oxide inclusion H13 casting Super-gravity field rotation speed
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A modified heat source model for rotating arc welding 被引量:2
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作者 郭宁 韩焱飞 +1 位作者 张琳琳 邹妍 《China Welding》 EI CAS 2011年第3期57-62,共6页
A modified mathematical model of heat source for rotating arc welding (RAW) process was developed for investigating the heat and temperature distribution. The characteristics of temperature field based on the comple... A modified mathematical model of heat source for rotating arc welding (RAW) process was developed for investigating the heat and temperature distribution. The characteristics of temperature field based on the complex welding motion trajectory were studied. In this work, a transient three-dimensional ( 3D ) model was established and computed by a finite element analysis computer program MARC as well as its subroutine. In RA'W process, the temperature changes in the style of stepladder. Moreover in the high temperature zone, there are multiple peak temperature points. These characteristics of temperature distribution are induced by the arc rotating which leads the repetitive heating or fasing during the welding process. In contrast with non-rotating arc (NRAW) process, the width of temperature distribution enlarges, and the peak temperature of weld pool decreases. Good agreement is shown between the computed results and experimental results of thermal cycle in RAW process. 展开更多
关键词 rotating arc process temperature distribution finite element analysis
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Effect of rotation in generalized thermoelastic solid under the influence of gravity with an overlying infinite thermoelastic fluid 被引量:1
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作者 Praveen Ailawalia Naib Singh Narah 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2009年第12期1505-1518,共14页
The present problem is concerned with the study of deformation of a rotating generalized thermoelastic solid with an overlying infinite thermoelastic fluid due to different forces acting along the interface under the ... The present problem is concerned with the study of deformation of a rotating generalized thermoelastic solid with an overlying infinite thermoelastic fluid due to different forces acting along the interface under the influence of gravity.The components of displacement,force stress,and temperature distribution are first obtained in Laplace and Fourier domains by applying integral transforms,and then obtained in the physical domain by applying a numerical inversion method.Some particular cases are also discussed in the context of the problem.The results are also presented graphically to show the effect of rotation and gravity in the medium. 展开更多
关键词 rotatION GRAVITY generalized thermoelasticity thermoelastic fluid Laplaceand Fourier transforms temperature distribution
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INTELLIGENT INTEGRATION CONTROL OF ROTATING DISK VIBRATION
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作者 Qiu Jinbo,Huang Xieqing,Wang Daqing (School of Mechanical Engineering, Xi’an Jiaotong University) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2001年第4期330-335,共6页
The rotating disk is a basic machine part that is u sed widely in industry. The motion equation is transformed into the dynamic equa tion in real modal space. The personating intelligent integration is introduced to ... The rotating disk is a basic machine part that is u sed widely in industry. The motion equation is transformed into the dynamic equa tion in real modal space. The personating intelligent integration is introduced to improve the existing control method. These modes that affect the transverse vibration mainly are included to simulate the vibration of rotating disk, and two methods are applied separately on condition that the sensor and the ac tuator are collocated and non collocated. The results obtained by all sided si mulations show that the new method can obtain better control effect, especially when the sensor and the actuator are non collocated. 展开更多
关键词 rotating disk distributed parameter Gyroscopic system Active control Intelligent integration
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An advanced wind vector retrieval algorithm for the rotating fan-beam scatterometer
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作者 XIE Xuetong WEN Ya HUANG Zhou 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第5期83-89,共7页
The rotating fan-beam scatterometer (RFSCAT) is a new type of satellite scatterometer that is proposed approximately 10 a ago. However, similar to other rotating scatterometers, relatively larger wind retrieval erro... The rotating fan-beam scatterometer (RFSCAT) is a new type of satellite scatterometer that is proposed approximately 10 a ago. However, similar to other rotating scatterometers, relatively larger wind retrieval errors occur in the nadir and outer regions compared with the middle regions of the swath. For the RFSCAT with the given parameters, a wind direction retrieval accuracy decreases by approximately 9 in the outer regions compared with the middle region. To address this problem, an advanced wind vector retrieval algorithm for the RFSCAT is presented. The new algorithm features an adaptive extension of the range of wind direction for each wind vector cell position across the whole swath according to the distribution histogram of a retrieved wind direction bias. One hundred orbits of Level 2A data are simulated to validate and evaluate the new algorithm. Retrieval experiments demonstrate that the new advanced algorithm can effectively improve the wind direction retrieval accuracy in the nadir and outer regions of the RFSCAT swath. Approximately 1.6 and 9 improvements in the wind direction retrieval are achieved for the wind vector cells located at the nadir and the edge point of the swath, respectively. 展开更多
关键词 rotating fan-beam scatterometer objective function wind vector retrieval distribution histogram ofbias wind direction extension
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Experimental investigation of the mixing efficiency via intensity of segregation along axial direction of a rotating bar reactor
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作者 Abdelgadir Bashir Banaga Yan-Bin Li +2 位作者 Zhi-Hao Li Bao-Chang Sun Guang-Wen Chu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第7期153-159,共7页
As a significant index to evaluate the mixing efficiency,studying the concentration distribution is directly related to the intensity of segregation(I_(s)).In this work,the I_(s) of the mixture composed of NaCl soluti... As a significant index to evaluate the mixing efficiency,studying the concentration distribution is directly related to the intensity of segregation(I_(s)).In this work,the I_(s) of the mixture composed of NaCl solutionwater was investigated experimentally in a rotating bar reactor(RBR)by the conductivity method.The results showed that the mixing efficiency was improved along the axial direction from the bottom to the top in the RBR.The concentration distribution at the bottom section was more uneven,and I_(s) was higher compared with the top section,which decreased from 6.53×10^(-5)to 1.57×10^(-7).With the increase of rotational speed from 0 to 700 r·min^(-1),I_s at the bottom and top sections decreased from 4.27×10^(-3)to 7.10×10^(-5)and from 1.93×10^(-3)to 7.29×10^(-7),respectively.The increases flow rate of solution A,and the decreases of concentration of NaCl and flow rate of solution B gave rise to the reduction of I_(s),signifying an improved mixing efficiency.The results revealed that the conductivity method used in this paper has high efficiency and low cost to measure the I_(s),which indicates a promising prospect for estimating reactors'mixing performance. 展开更多
关键词 Intensity of segregation Mixing efficiency rotating bar reactor Conductivity method Concentration distribution
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复杂结构井旋转下套管数学模型建立与分析 被引量:1
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作者 杨谋 王鑫宇 +3 位作者 蒲欢 李郑涛 吴双 胥猛生 《科学技术与工程》 北大核心 2024年第5期1870-1877,共8页
随着复杂结构井钻井技术发展,井斜角和方位角随着井深复杂变化引起常规套管下入方式难度大,旋转下套管技术可有效解决套管下入的难题,但该方面的理论模拟分析报道较少,增加了旋转下套管技术应用的盲目性和低效性。综合运用软杆和刚杆模... 随着复杂结构井钻井技术发展,井斜角和方位角随着井深复杂变化引起常规套管下入方式难度大,旋转下套管技术可有效解决套管下入的难题,但该方面的理论模拟分析报道较少,增加了旋转下套管技术应用的盲目性和低效性。综合运用软杆和刚杆模型的优点并考虑井眼轨迹对模型计算条件影响,建立了旋转下套管数学模型;结合实例井对比了大钩载荷和模拟的轴向应力,验证了模型的正确性;在此基础上,探讨了常规和不同旋转速度下套管的摩阻,并分析了不同摩阻系数条件下的摩阻分布特征。实例分析表明:相同井深下,旋转下套管摩阻小于常规下套管摩阻,并且旋转速度越快,下套管摩阻越小;当旋转速度分别为15 r/min和20 r/min时,井底处摩阻降低幅度分别为12.13%和19.17%;造斜率越大,摩阻越高,导致套管下入到指定深度难度加大;钻井液摩阻系数越大,套管下入难度越高;在井深1 401.5 m,裸眼段摩阻系数分别为0.21和0.29,常规下套管摩阻分别为46.51 kN和57.49 kN。该模型能准确预测下套管摩阻,对复杂结构井的套管下入具有指导意义。 展开更多
关键词 复杂结构井 套管摩阻 旋转下套管 摩阻计算模型 摩阻分布特征
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