Interaction between turbulence and thermal radiation in combined heat transfer channel flows

Abstract

The aim of the present work is to examine the effects of interaction between turbulence and thermal radiation on the fully developed turbulent channel flow with variable properties in the presence of combined mixed convection‐radiation heat transfer. The vertical and horizontal channels under study are formed by differentially heated flat parallel plates. Large eddy simulation and the low Mach number approach are used to solve the governing equations. Also, the radiative transfer equation is solved using the P 1 method. The results are achieved by developing a solver in an open‐source computational fluid dynamics toolbox. The main focus is to find out whether neglecting turbulence‐radiation interaction (TRI) is a valid assumption for such flows under consideration. The present results show that, in both configurations, the maximum values of emission TRI and incident TRI are 2% and 3%, respectively. These results are consistent with the previous findings suggesting that in the nonreactive flows, these two terms are negligible.

The Influence of Billet Spacing on Heating Efficiency is Studied Based on Simulation Analysis

“…Yu wanhua et al took the upper and lower surface temperature of billet measured by thermocouple as the boundary, simulated the billet temperature field by Matlab language programming, and verified the accuracy of the model by comparing the "black box" experimental data [3]. Moghaddam et al used high eddy simulation and low Mach number methods to study the influence of turbulence and thermal radiation interaction on heat flow and heat flow in the channel under mixed convection-radiation heat transfer conditions [4]. Wick et al established a temperature prediction model of billet heating process in the heating furnace, and applied Kalman filtering technology to estimate the dynamic state of heating system, but this model could only predict the surface temperature of billet [5].…”