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曲母线螺旋叶片对颗粒流动行为的影响 被引量:1
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作者 王强 许镱巍 赵春江 《重型机械》 2020年第6期29-33,共5页
在垂直螺旋输送机输送过程中,明显存在颗粒附着输送轴进行周向运动的现象,这种现象抑制了颗粒的轴向运动。本文提出了改变螺旋叶片截面母线形状,即采用非直线型截面的螺旋叶片进行物料输送的方案。采用离散元仿真(DEM)分析方法对垂直螺... 在垂直螺旋输送机输送过程中,明显存在颗粒附着输送轴进行周向运动的现象,这种现象抑制了颗粒的轴向运动。本文提出了改变螺旋叶片截面母线形状,即采用非直线型截面的螺旋叶片进行物料输送的方案。采用离散元仿真(DEM)分析方法对垂直螺旋输送机分别采用直母线和曲母线的螺旋叶片输送过程进行模拟。模拟结果表明,采用曲母线螺旋叶片进行输送时输送机料槽内的颗粒在轴向速度不变的前提下向料槽外侧堆积,有效改善颗粒流形并提高输送效率。 展开更多
关键词 垂直螺旋输送机 曲母线螺旋叶片 颗粒流形 接触状态
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Numerical Simulation of Viscous Flow Through Spherical Particle Assemblage with the Modified Cell Model 被引量:9
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作者 毛在砂 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第2期149-162,共14页
The cell model developed since 1950s is a useful tool forexploring the behavior of particle assemblages, but it demandsfurther careful development of the outer boundary conditions so thatinteraction in a particle swar... The cell model developed since 1950s is a useful tool forexploring the behavior of particle assemblages, but it demandsfurther careful development of the outer boundary conditions so thatinteraction in a particle swarm is better represented. In this paper,the cell model and its development were reviewed, and themodifications of outer cell boundary conditions were suggested. Atthe cell outer boundary, the restriction of uniform liquid flow wasremoved in our simulation conducted in the reference frame fixed withthe particle. 展开更多
关键词 cell model numerical simulation particle assemblage boundary condition
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Flow Behaviors of Non-spherical Granules in Rectangular Hopper 被引量:7
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作者 JIN Baosheng TAO He ZHONG Wenqi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第6期931-939,共9页
Flow behaviors of four kinds of granular particles(i.e. sphere,ellipsoid,hexahedron and binary mixture of sphere and hexahedron) in rectangular hoppers were experimentally studied. The effects of granular shape and ho... Flow behaviors of four kinds of granular particles(i.e. sphere,ellipsoid,hexahedron and binary mixture of sphere and hexahedron) in rectangular hoppers were experimentally studied. The effects of granular shape and hopper structure on flow pattern,discharge fraction,mean particle residence time and tracer concentration distribu-tion were tested based on the visual observation and particle tracer technique. The results show that particle shape affects significantly the flow pattern. The flow patterns of sphere,ellipsoid and binary mixture are all parabolic shape,and the flow pattern shows no significant difference with the change of wedge angle. The flowing zone be-comes more sharp-angled with the increasing outlet size. The flow pattern of hexahedron is featured with straight lines. The discharge rates are in increasing order from hexahedron,sphere,binary mixture to ellipsoid. The dis-charge rate also increases with the wedge angle and outlet size. The mean particle residence time becomes shorter when the outlet size increases. The difference of mean particle residence time between the maximum and minimum values decreases as the wedge angle increases. The residence time of hexahedron is the shortest. The tracer concen-tration distribution of hexahedron at any height is more uniform than that of binary mixture. The tracer concentra-tion of sphere in the middle is lower than that near the wall,and the contrary tendency is found for ellipsoid particles. 展开更多
关键词 non-spherical particle flow behavior rectangular hopper wedge angle
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Grain Composition and Erosive Equilibrium of Debris Flows 被引量:3
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作者 LI Yong LIU Jingling CHEN Xiaoqing WEI Fangqiang 《Journal of Mountain Science》 SCIE CSCD 2007年第1期71-76,共6页
Debris flows consist of grains of various sizes ranging from 10^(-6) m ~1 m. Field observations in the Jiangjia Gully (JJG) and other sites throughout China indicate that the grain size distribution of sediment in de... Debris flows consist of grains of various sizes ranging from 10^(-6) m ~1 m. Field observations in the Jiangjia Gully (JJG) and other sites throughout China indicate that the grain size distribution of sediment in debris flows can be characterized by an exponential function fit to the cumulative distribution. The exponent value for the function varies by location and may be useful in distinguishing between debris flows from different valleys. For example, minimum values and ranges of the exponent are associated with the high frequency of debris flows in the JJG. Furthermore, the distribution presents piecewise fractality (i.e. scaling laws hold in various ranges of the grain size) and we propose that the fractal structure determines the matrix and that the fractal dimension plays a crucial role in material exchange between a debris flow and the substrate it flows over. Finally, the empirical data support an exponential relation between grain composition and non-dimensional shear stress for the critical state of the channel. Overall we propose a material-determinism approach to studying debris flows which contrasts with the enviro-determinism that has dominated much recent work in this field. 展开更多
关键词 Grain composition FRACTAL erosion equilibrium debris flow
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Comparison of numerical simulations and experiments in conical gas–solid spouted bed 被引量:2
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作者 王淑彦 邵宝力 +4 位作者 刘锐 赵健 刘扬 刘义坤 杨树人 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第10期1579-1586,共8页
Flow behavior of gas and particles in conical spouted beds is experimentally studied and simulated using the twofluid gas-solid model with the kinetic theory of granular flow.The bed pressure drop and fountain height ... Flow behavior of gas and particles in conical spouted beds is experimentally studied and simulated using the twofluid gas-solid model with the kinetic theory of granular flow.The bed pressure drop and fountain height are measured in a conical spouted bed of 100 mm I.D.at different gas velocities.The simulation results are compared with measurements of bed pressure drop and fountain height.The comparison shows that the drag coefficient model used in cylindrical beds under-predicted bed pressure drop and fountain height in conical spouted beds due to the partial weight of particles supported by the inclined side walls.It is found that the numerical results using the drag coefficient model proposed based on the conical spouted bed in this study are in good agreement with experimental data.The present study provides a useful basis for further works on the CFD simulation of conical spouted bed. 展开更多
关键词 FLUIDIZATION Simulation EXPERIMENT Conical spouted bed Drag coefficient model Computational fluid dynamics
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Analysis of drop deformation dynamics in turbulent flow 被引量:1
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作者 Stephanie Nachtigall Daniel Zedel Matthias Kraume 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第2期264-277,共14页
Drop breakage and coalescence influence the particle formation in liquid-liquid dispersions. In order to reduce the influencing factors of the whole dispersion process, single drops where coalescence processes can be ... Drop breakage and coalescence influence the particle formation in liquid-liquid dispersions. In order to reduce the influencing factors of the whole dispersion process, single drops where coalescence processes can be neglected were analyzed in this work. Drops passing the turbulent vicinity of a single stirrer blade were investi- gated by high-speed imaging. In order to gain a statistically relevant amount of drops passing the area of interest and corresponding breakage events, at least 1600 droplets were considered for each parameter set of this work. A specially developed fully automatic image analysis based on Matlab was used for the evaluation of the resulting high amount of image data. This allowed the elimination of the time-consuming manual analysis and further- more, allowed the objective evaluation of the drops' behavior. Different deformation parameters were consid- ered in order to describe the drop deformation dynamics properly. Regarding the ratio of both main particle axes (0axes), which was therefore approximated through an ellipse, allowed the determination of very small de- viations from the spherical shape. The perimeter of the particle (0peri) was used for the description of highly de- formed shapes. In this work the results of a higher viscosity paraffin oil (ηd =127 mPa. s) and a low viscosity solvent (petroleum, ηd = 1.7 mPa-s) are presented with and without the addition of SDS to the continuous water phase. All results show that the experimentally determined oscillation but also deformation times underlie a wide spreading. Drop deformations significantly increased not only with increasing droplet viscosity, but also with decreasing interfacial tension. Highly deformed particles of one droplet species were more likely to break than more or less spherical particles. As droplet fragmentation results from a variety of different macro-scale de- formed particles, it is not assumed that a critical deformation value must be reached for the fragmentation pro- cess to occur. Especially for highly deformed particles thin particle filaments are assumed to induce the breakage process and, therefore, be responsible for the separation of drops. 展开更多
关键词 Drop deformation Drop breakage Liquid-liquid system Turbulent mixing Image analysis High-speed imaging
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Soil Aggregates and Fractal Features under Different Land Use Types in a Frequent Debris Flow Area 被引量:1
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作者 XIE Xian-jian WEI Fang-qiang 《Journal of Mountain Science》 SCIE CSCD 2013年第3期437-444,共8页
The stability of soil aggregates and the fractal characteristics of four typical land use types(farmland,grassland,woodland,and bare land) in the Jiangjiagou Ravine(Yunnan,China),a frequent debris flow occurring area,... The stability of soil aggregates and the fractal characteristics of four typical land use types(farmland,grassland,woodland,and bare land) in the Jiangjiagou Ravine(Yunnan,China),a frequent debris flow occurring area,were studied according to the normal mean mass diameter and fractal theory.The present research showed that the stability of the soil aggregates was different for the different land use types.When the soil depth was 0-30 cm,farmland soil formed more aggregates with diameters greater than 0.25 mm,i.e.,the farmland soil was more stable than that of the other three land uses.When the soil depth was 30-45 cm,the order of stability of the soil aggregates was woodland > grassland > farmland > bare land.The fractal dimensions had a significant linear positive correlation with the amount of soil particles with diameters of <0.25 mm,and a significant negative linear correlation with the amount of soil particles with diameters of 0.25-0.5 mm,0.5-1 mm and 1-2 mm.Smaller fractal dimensions of the soil particles correlated with more stable soil aggregates.The fractal dimensions had a positive linear correlation with the soil bulk density and a negative correlation with the concentration of organic matter.These results showed that soil aggregates can be used as a parameter for characterizing the soil structures and properties.According to these results,the soil particle fractal dimensions could not only objectively characterize the stability of the soil structure but also could be used to indicate soil structure and properties.In addition,these results have great significance for the discussion of the comprehensive evaluation of soil. 展开更多
关键词 Debris flow Land use pattern AGGREGATES Fractal dimension
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Calculation of terminal velocity in transitional flow for spherical particle
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作者 Zhang Lei Honaker Ricky +2 位作者 Liu Wenli Men Dongpo Chen Jinxiang 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第2期311-317,共7页
The terminal velocity has been widely used in extensive fields, but the complexity of drag coefficient expression leads to the calculation of terminal velocity in transitional flow (1 〈 Re ≤ 1000) with much more d... The terminal velocity has been widely used in extensive fields, but the complexity of drag coefficient expression leads to the calculation of terminal velocity in transitional flow (1 〈 Re ≤ 1000) with much more difficulty than those in laminar flow (Re ≤ 1) and turbulent flow (Re ≥ 1000). This paper summarized and compared 24 drag coefficient correlations, and developed an expression for calculating the terminal velocity in transitional flow, and also analyzed the effects of particle density and size, fluid density and viscosity on terminal velocity. The results show that 19 of 24 previously published correlations for drag coefficient have good prediction performance and can be used for calculating the terminal velocity in the entire transitional flow with higher accuracy. Adapting two dimensionless parameters (w*, d*), a proposed explicit correlation, w*=-25.68654 × exp (-d*/77.02069)+ 24.89826, is attained in transitional flow with good performance, which is helpful in calculating the terminal velocity. 展开更多
关键词 Transitional flow Drag coefficient Terminal velocity Spherical particle Calculation
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Preparation of Calcium Carbonate Nanoparticles with a Continuous Gas-liquid Membrane Contactor: Particles Morphology and Membrane Fouling 被引量:1
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作者 JIA Zhiqian CHANG Qing QIN Jin MAMATA Aynur 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第2期121-126,共6页
Nanosized calcium carbonate particles were prepared with a continuous gas-liquid membrane contactor. The effects of Ca(OH)2 concentration, CO2 pressure and liquid flow velocity on the particles morphology, pressure dr... Nanosized calcium carbonate particles were prepared with a continuous gas-liquid membrane contactor. The effects of Ca(OH)2 concentration, CO2 pressure and liquid flow velocity on the particles morphology, pressure drop and membrane fouling were studied. With rising Ca(OH)2 concentrations, the average size of the particles increased. The effects of Ca(OH)2 concentration and CO2 pressure on particles were not apparent under the experimental conditions. When the Ca(OH)2 concentration and liquid flow velocity were high, or the CO2 pressure was low, the fouling on the membrane external surface at the contactor entrance was serious due to liquid leakage, whereas the fouling was slight at exit. The fouling on the membrane inner-surface at entrance was apparent due to adsorption of raw materials. The membrane can be recovered by washing with dilute hydrochloric acid and reused for at least 6 times without performance deterioration. 展开更多
关键词 membrane contactor gas-liquid reaction CaCO3 nanoparticles two-phase reaction membrane absorption
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Number Concentration of Cylindrical Particles in a Fluidized Bed 被引量:1
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作者 蔡杰 赵孝保 +1 位作者 李奇贺 袁竹林 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第1期94-103,共10页
In this study, a three-dimensional model based on RANS, slender-body theory and Newton-Euler dynamics is established to study the number concentration, one of the most important fluidization characteristics of cylindr... In this study, a three-dimensional model based on RANS, slender-body theory and Newton-Euler dynamics is established to study the number concentration, one of the most important fluidization characteristics of cylindrical particles. Also, the effects of interaction between cylindrical particles are taken into account by introducing the rigid collision dynamics. To validate the model, the fluidization experiments of cylindrical particles in a cold-state fluidized bed are carried out. The number concentration characteristics of cylindrical particles are obtained from computational fluid dynamics (CFD) simulation. It is found that cylindrical particles arriving at the exit of the riser the earliest come from the near-wall regions, the horizontal transfer of so many cylindrical particles from the radial centre regions to the near-wall regions is evident. Meanwhile, there is no distinct relationship between the number concentration and inlet wind velocity. 展开更多
关键词 number concentration cylindrical particles a three-dimensional model interaction between cylindrical particles numerical simulation
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Solid concentration and velocity distributions in an annulus turbulent fluidized bed
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作者 吴诚 高用祥 +2 位作者 成有为 王丽军 李希 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第7期1077-1084,共8页
Solid concentration and particle velocity distributions in the transition section of a Ф 200 mm turbulent fluidized bed (TFB) and a q5200 mrn annulus turbulent fluidized bed (A-TFB) with a Ф 50 mm central standp... Solid concentration and particle velocity distributions in the transition section of a Ф 200 mm turbulent fluidized bed (TFB) and a q5200 mrn annulus turbulent fluidized bed (A-TFB) with a Ф 50 mm central standpipe were measured using a PVBD optical probe. It is concluded that in turbulent regime, the axial distribution of solid concentration in A-TFB was similar to that in TFB, but the former had a shorter transition section. The axial solid concentration distribution, probability density, and power spectral distributions revealed that the standpipe hin- dered the turbulence of gas-solid two-phase flow at a low superficial gas velocity. Consequently, the bottom flow of A-TFB approached the bubbling fluidization pattern. By contrast, the standpipe facilitated the turbulence at a high superficial gas velocity, thus making the bottom flow of A-TFB approach the fast fluidization pattern. Both the particle velocity and solid concentration distribution presented a unimodal distribution in A-TFB and TFB. However, the standpipe at a high gas velocity and in the transition or dilute phase section significantly affected the radial distribution of flow parameters, presenting a bimodal distribution with particle concentration higher near the internal and external walls and in downward flow. Conversely, particle concentration in the middle an- nulus area was lower, and particles flowed upward. This result indicated that the standpipe destroyed the coreannular structure of TFB in the transition and dilute phase sections at a high gas velocity and also improved the particle distribution of TFB. In conclusion, the standpipe improved the fluidization quality and flow homogeneity at high gas velocity and in the transition or dilute phase section, but caused opposite phenomena at low gas velocity and in the dense-phase section. 展开更多
关键词 FluidizationAnnulus bedTransition sectionHydrodynamicsTurbulence
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On the some issues of particle motion in the flow of viscoelastic fluids
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作者 Zhenna Li Jianzhong Lin 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第3期1-9,I0001,共10页
Particle motion in confined shear flow of viscoelastic fluids is very common in nature and has a wide range of applications.Understanding and mastering the motion characteristics of particles in viscoelastic fluids ha... Particle motion in confined shear flow of viscoelastic fluids is very common in nature and has a wide range of applications.Understanding and mastering the motion characteristics of particles in viscoelastic fluids has important academic value and practical significance.In this paper,we first introduce the related equations and characteristic parameter,and then emphasize the following issues:the lateral equilibrium position of particle;interaction and aggregation of multiple particles;the chain structure formed by multiple particles;and the motion of non-spherical particle.Finally,some unresolved issues,challenges,and future research directions are highlighted. 展开更多
关键词 PARTICLE Viscoelastic fluid Shear flow
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Simulations of Bingham plastic flows with the multiple-relaxation-time lattice Boltzmann model 被引量:4
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作者 CHEN SongGui SUN QiCheng +1 位作者 JIN Feng LIU JianGuo 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第3期532-540,共9页
Fresh cement mortar is a type of workable paste, which can be well approximated as a Bingham plastic and whose flow behavior is of major concern in engineering. In this paper, Papanastasiou's model for Bingham fluids... Fresh cement mortar is a type of workable paste, which can be well approximated as a Bingham plastic and whose flow behavior is of major concern in engineering. In this paper, Papanastasiou's model for Bingham fluids is solved by using the multiple- relaxation-time lattice Boltzmann model (MRT-LB). Analysis of the stress growth exponent m in Bingham fluid flow simulations shows that Papanastasiou's model provides a good approximation of realistic Bingham plastics for values of m 〉 108. For lower values of m, Papanastasiou's model is valid for fluids between Bingham and Newtonian fluids. The MRT-LB model is validated by two benchmark problems: 2D steady Poiseuille flows and lid-driven cavity flows. Comparing the numerical results of the velocity distributions with corresponding analytical solutions shows that the MRT-LB model is appropriate for studying Bingham fluids while also providing better numerical stability. We further apply the MRT-LB model to simulate flow through a sudden expansion channel and the flow surrounding a round particle. Besides the rich flow structures obtained in this work, the dynamics fhi d force on the round particle is calculated. Results show that both the Reynolds number Re and the Bingham number Bn affect the drag coefficients Co, and a drag coefficient with Re and Bn being taken into account is proposed. The relationship of Bn and the ratio of unyielded zone thickness to particle diameter is also analyzed. Finally, the Bingham fluid flowing around a set of randomly dispersed particles is simulated to obtain the apparent viscosity and velocity fields. These results help simulation of fresh concrete flowing in porous media. 展开更多
关键词 Bingham fluids multiple-relaxation-time lattice Boltzmann model tbw profiles drag coefficient
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PARTICULATE SUSPENSION FLOW INDUCED BY SINUSOIDAL PERISTALTIC WAVES THROUGH ECCENTRIC CYLINDERS: THREAD ANNULAR 被引量:4
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作者 KH. S. MEKHEIMER Y. ABD ELMABOUD A. I. ABDELLATEEF 《International Journal of Biomathematics》 2013年第4期113-137,共25页
This paper describes a new model for obtaining analytical solutions of peristaltic flow through eccentric annuli. A mathematical model of peristaltic pumping of a fluid mixture (as blood model) in a circular eccentr... This paper describes a new model for obtaining analytical solutions of peristaltic flow through eccentric annuli. A mathematical model of peristaltic pumping of a fluid mixture (as blood model) in a circular eccentric cylinders is presented and it is motivated due to the fact that thread injection is a promising method for placing medical implants within the human body with minimum surgical trauma. For the eccentric annuli, the inner cylinder is rigid and moving with a constant velocity V, and the outer one is hollow flexible cylinder that has a sinusoidal wave traveling down its wall. The coupled differential equations for both the fluid and the particle phases have been solved by using two methods and the expressions for the velocity distribution of fluid and particle phase, flow rate, pressure drop, friction forces at the inner and outer cylinders have been derived. The results obtained are discussed in brief. The significance of the particle concentration and the eccentricity parameter as well as the nature of the basic flow has been well explained. 展开更多
关键词 ECCENTRIC annulus flows particle fluid suspension PERISTALSIS ENDOSCOPE
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Transport phenomena for a spherical particle in pure extensional and simple shear flows
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作者 ZHANG JingSheng CHEN Jie +1 位作者 YANG Chao MAO ZaiSha 《Science Foundation in China》 CAS 2013年第1期73-93,共21页
Particles(including solid particles,liquid drops and gas bubbles)are ubiquitous in a large number of natural processes as well as in industrial productions.Their behaviors are of fundamental importance in multiphase s... Particles(including solid particles,liquid drops and gas bubbles)are ubiquitous in a large number of natural processes as well as in industrial productions.Their behaviors are of fundamental importance in multiphase systems since the existence of such dispersed particles influences the momentum,mass and heat transport behaviors in these systems.Up to now,a vast body of literature has been published in dealing with the transport phenomena related to a particle surrounded by a fluid under various physical circumstances.In this paper,principal research results for the transport process of a single spherical particle in pure extensional and simple shear flows presented in the literature,including our recent work,are generally reviewed in order to give a comprehensive knowledge in this area. 展开更多
关键词 PARTICLE Pure extensional flow Simpleshear flow Mass transfer Heat transfer
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Metallic nanoparticles analysis for the blood flow in tapered stenosed arteries: Application in nanomedicines 被引量:1
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作者 Noreen Sher Akbar 《International Journal of Biomathematics》 2016年第1期29-46,共18页
Blood flow model is recycled to study the influence of magnetic field and nanoparticles in tapered stenosed arteries. The metallic nanoparticles for the blood flow with water as base fluid are not explored so far. The... Blood flow model is recycled to study the influence of magnetic field and nanoparticles in tapered stenosed arteries. The metallic nanoparticles for the blood flow with water as base fluid are not explored so far. The representation for the blood flow is through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the deve- loping stenosis is another important feature of our analysis. Exact solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different types of tapered arteries (i.e. conver- ging tapering, diverging tapering, non-tapered artery) have been examined for different parameters of interest for pure water and Copper water (Cu-water). 展开更多
关键词 Blood flow Cu-water NANOFLUID tapered arteries exact solution.
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