Kinetic Equation for Particle Transport and Heat Transfer in Nonisothermal Turbulent Flows

AIAA Journal ◽  
2003 ◽  
Vol 41 (5) ◽  
pp. 841-847 ◽  
Author(s):  
R. V. R. Pandya ◽  
F. Mashayek
Keyword(s):  
Heat Transfer ◽  
Kinetic Equation ◽  
Turbulent Flows ◽  
Particle Transport

scholarly journals Kinetic equation for particle transport in turbulent flows

2020 ◽  
Vol 32 (7) ◽  
pp. 073301
Author(s):  
De-Yu Zhong ◽  
Guang-Qian Wang ◽  
Ming-Xi Zhang ◽  
Tie-Jian Li
Keyword(s):  
Kinetic Equation ◽  
Turbulent Flows ◽  
Particle Transport

Effects of Preferential Concentration on Heat Transfer in Particle-Based Solar Receivers

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Hadi Pouransari ◽  
Ali Mani
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Particle Transport ◽  
Three Dimensional ◽  
Stokes Number ◽  
Radiative Heating ◽  
Radiation Absorption ◽  
Order Unity ◽  
Carrier Fluid ◽  
Preferential Concentration

The working principle of particle-based solar receivers is to utilize the absorptivity of a dispersed particle phase in an otherwise optically transparent carrier fluid. In comparison to their traditional counterparts, which use a solid surface for radiation absorption, particle-based receivers offer a number of opportunities for improved efficiency and heat transfer uniformity. The physical phenomena at the core of such receivers involve coupling between particle transport, fluid turbulence, and radiative heat transfer. Previous analyses of particle-based solar receivers ignored delicate aspects associated with this three-way coupling. Namely, these investigations considered the flow fields only in the mean sense and ignored turbulent fluctuations and the consequent particle preferential concentration. In the present work, we have performed three-dimensional direct numerical simulations of turbulent flows coupled with radiative heating and particle transport over a range of particle Stokes numbers. Our study demonstrates that the particle preferential concentration has strong implications on the heat transfer statistics. We demonstrate that “for a typical setting” the preferential concentration of particles reduces the effective heat transfer between particles and the gas by as much as 25%. Therefore, we conclude that a regime with Stokes number of order unity is the least preferred for heat transfer to the carrier fluid. We also provide a 1D model to capture the effect of particle spatial distribution in heat transfer.

INCREASE OF HEAT TRANSFER AND NEGATIVE EDDY VISCOSITY IN TURBULENT FLOWS INFLUENCED BY A MAGNETIC FIELD

1990 ◽  
Author(s):  
C. Henoch ◽  
Martin Hoffert ◽  
A. Baron ◽  
D. Klaiman ◽  
Semion Sukoriansky ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Turbulent Flows ◽  
Eddy Viscosity
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