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research-article

Heat Transfer Modulation by Inertial Particles in Particle-Laden Turbulent Channel Flow

[+] Author and Article Information
Caixi Liu

Department of Mechanical Engineering, University of Minnesota, Minneapolis, 55455, USA; Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China
liux3755@umn.edu

Shuai Tang

Department of Mechanical Engineering, University of Minnesota, Minneapolis, 55455, USA; Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China
tangx701@umn.edu

Yuhong Dong

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China
dongyh@staff.shu.edu.cn

Lian Shen

Department of Mechanical Engineering, St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, 55455, USA
shen@umn.edu

1Corresponding author.

ASME doi:10.1115/1.4040347 History: Received February 22, 2017; Revised May 12, 2018

Abstract

We study the effects of particle-turbulence interactions on heat transfer in a particle-laden turbulent channel flow using direct numerical simulation for turbulence and Lagrangian tracking for particles. Our study focuses on the modulations of the temperature field and heat transfer process by inertial particles with different particle momentum Stokes numbers (St), which in combination of the particle-to-fluid specific heat ratio and the Prandtle number results in different particle heat Stokes numbers. It is found that as St increases, while the turbulent heat flux decreases, the particle feedback heat flux increases significantly and results in an increase in the total heat flux. Moreover, by taking advantage of the ability of numerical simulation to address different momentum and heat processes separately, we investigate the different roles played by the particle-to-fluid momentum feedback and heat feedback. It is found that the momentum feedback increases the fluid temperature fluctuation while the heat feedback decreases it, and both reduce the turbulent heat flux. The analyses of simulation data illustrate the two processes of particles affecting heat transfer, namely the direct effect of particle thermal feedback to the fluid and the indirect effect of the modulation of turbulent heat flux due to the suppression of wall-normal turbulence velocity fluctuation by the particles. Our results indicate that both the momentum feedback and the heat feedback are important when the particle inertia is large, suggesting that both feedback processes need be taken into account in computation and modeling.

Copyright (c) 2018 by ASME
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