Numerical Simulation on Effect of Rotation on Thermal Convection in a Shallow Model Czochralski Configuration with a Heated Bottom

2018 ◽  
Vol 53 (9) ◽  
pp. 1700268 ◽  
Author(s):  
Ting Shen ◽  
Chun-Mei Wu ◽  
You-Rong Li
Keyword(s):  
Numerical Simulation ◽  
Thermal Convection

scholarly journals Direct numerical simulation of the sedimentation of solid particles with thermal convection

2003 ◽  
Vol 481 ◽  
pp. 385-411 ◽  
Author(s):  
HUI GAN ◽  
JIANZHONG CHANG ◽  
JAMES J. FENG ◽  
HOWARD H. HU
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Thermal Convection ◽  
Solid Particles

scholarly journals DIRECT NUMERICAL SIMULATION OF PARTICLE SEDIMENTATION IN TWO-PHASE FLOW UNDER THERMAL CONVECTION

2011 ◽  
Vol 08 (04) ◽  
pp. 851-861 ◽  
Author(s):  
J. Z. CHANG ◽  
H. T. LIU ◽  
T. X. SU ◽  
M. B. LIU
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Thermal Convection ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Particle Sedimentation ◽  
Two Phase ◽  
Elliptical Particles ◽  
Particle Shapes ◽  
Sedimentation Processes

This paper presents a direct numerical simulation of particle sedimentation in two-phase flow with thermal convection. The sedimentation processes of elliptical particles are investigated in three different scenarios with isotherm, hot, and cold Newtonian fluids. We demonstrate that different particle shapes and orientations can result in quite different flow behaviors. Some interesting results have been obtained, which are very helpful for better understanding of the particle sedimentation processes.

scholarly journals Concluding remarks

2006 ◽  
Vol 2 (S239) ◽  
pp. 517-522
Author(s):  
Jean-Paul Zahn
Keyword(s):  
Numerical Simulation ◽  
Accretion Disks ◽  
Thermal Convection ◽  
New Techniques ◽  
Spatial And Temporal Scales ◽  
Convective Flows ◽  
The Past ◽  
Wide Range ◽  
Astrophysical Objects ◽  
Substantial Progress

Thermal convection occurs in most objects that populate our Universe, whenever radiation is insufficient to transport the heat because the medium is too opaque. In astrophysical objects convection involves a wide range of spatial and temporal scales - experts call this turbulence - which makes it rather difficult to model. For this reason convection remains one of the major uncertainties when modeling stars and planets, and this is partly true also for accretion disks. However, substantial progress has been achieved during the past years, both in the numerical simulation of convective regions and in the observation of convective flows by various new techniques.

Numerical Simulation of Heat Transfer in Shear Flow of Liquid-Solid Two-Phase Media by Immersed Solid Approach

2015 ◽  
Author(s):  
Takeo Kajishima ◽  
Katsuya Kondo ◽  
Shintaro Takeuchi
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Thermal Convection ◽  
Heat Conductivity ◽  
Three Dimensional ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Two Phase ◽  
Dimensional Simulation ◽  
Conductive Particles

We developed a direct numerical simulation (DNS) method of solid-fluid two-phase flows to study the effects of heat conductivity within a solid particle and the particle motion on the heat transfer. Heat transfer and particle behaviors were studied for different ratios of heat conductivity (solid to liquid) and solid volume fractions. The simulation results emphasize the effect of temperature distributions within the particles, and the heat transfer through each particle plays an important role for the motion of the particulate flow. The particle-laden flow in a two-dimensional channel of instable thermal stratification, namely hot wall at the bottom and cold wall at the top, is simulated. In the two-dimensional computation, the heat transfer attenuates by increasing the neutral conductive particles because of the resistance to the thermal convection. In case of highly conductive particles, the thermal convection and conductions are enhanced to some extent of addition but the overload of particles suddenly reduces the intensity of convection, resulting in the lower heat transfer. The inverse gradient of mean temperature is observed particularly in case of moderate loading of neutral conductive particles. It is due to the modulation of the profile of convection cells. Most of the above-mentioned findings are reproduced by the fully three-dimensional simulation.

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