An Efficient Method for Radiative Heat Transfer Applied to a Turbulent Channel Flow

2009 ◽  
Vol 132 (2) ◽  
Author(s):  
Atsushi Sakurai ◽  
Shigenao Maruyama ◽  
Koji Matsubara ◽  
Takahiro Miura ◽  
Masud Behnia
Keyword(s):  
Heat Transfer ◽  
Radiative Transfer ◽  
Channel Flow ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Simple Algorithm ◽  
Turbulent Channel Flow ◽  
Simulation Method ◽  
Heat Fluxes ◽  
Independent Column

The purpose of this paper is to consider a possibility of the independent column approximation for solving the radiative heat fluxes in a 3D turbulent channel flow. This simulation method is the simplest extension of the plane-parallel radiative heat transfer. The test case of the temperature profile was obtained from the direct numerical simulation. We demonstrate the comparison between the 3D radiative transfer simulation and the independent column approximation with an inhomogeneous temperature field and optical properties. The above mentioned results show the trivial discrepancies between the 3D simulation and the independent column approximation. The required processing time for the independent column approximation is much faster than the 3D radiative transfer simulation due to the simple algorithm. Although the independent column simulation is restricted to simple configurations such as channel flow in this paper, wide application areas are expected due to the computational efficiency.

scholarly journals Turbulence radiation interaction in channel flow with various optical depths

2017 ◽  
Vol 834 ◽  
pp. 359-384 ◽  
Author(s):  
S. Silvestri ◽  
A. Patel ◽  
D. J. E. M. Roekaerts ◽  
R. Pecnik
Keyword(s):  
Heat Transfer ◽  
Channel Flow ◽  
Optical Thickness ◽  
Radiative Heat Transfer ◽  
Large Scale ◽  
Radiative Heat ◽  
Turbulent Channel Flow ◽  
Significant Rise ◽  
Temperature Variance ◽  
Cold Walls

The present work consists of an investigation of the turbulence radiation interaction (TRI) in a radiative turbulent channel flow of grey gas bounded by isothermal hot and cold walls. The optical thickness $\unicode[STIX]{x1D70F}$ of the channel is varied from 0.1 to 10 to observe different regimes of TRI. A high-resolution finite volume method for radiative heat transfer is employed and coupled with the direct numerical simulation (DNS) of the flow. The resulting effects of TRI on temperature statistics are strongly dependent on the considered optical depth. In particular, the contrasting role of emission and absorption is highlighted. For a low optical thickness the effect of radiative fluctuations on temperature statistics is low and causes the reduction of temperature variance through the dissipating action of emission. On the other hand, while increasing optical thickness to relatively high levels, the dissipation of temperature variance is balanced, at low wavenumbers in the turbulence spectrum, through the preferential action of absorption, which increases the large-scale temperature fluctuations. A significant rise in the effect of radiation on the temperature variance can be observed as a consequence of the reduction of radiative heat transfer length scales.

1209 Radiative Heat Transfer in a Turbulent Channel Flow

2010 ◽  
Vol 2010.47 (0) ◽  
pp. 451-452
Author(s):  
Atsushi SAKURAI ◽  
Koji MATSUBARA ◽  
Kenji TAKAKUWA ◽  
Shigenao MARUYAMA
Keyword(s):  
Heat Transfer ◽  
Channel Flow ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Turbulent Channel Flow

DNS of Heat Transfer Reduction in Viscoelastic Turbulent Channel Flows

2015 ◽  
Author(s):  
Kyoungyoun Kim ◽  
Radhakrishna Sureshkumar
Keyword(s):  
Heat Transfer ◽  
Channel Flow ◽  
Reduction Rate ◽  
Turbulent Channel Flow ◽  
Passive Scalar ◽  
Heat Fluxes ◽  
Turbulent Heat Transfer ◽  
Uniform Heat Flux ◽  
Turbulent Heat ◽  
Turbulent Heat Fluxes

A direct numerical simulation (DNS) of viscoelastic turbulent channel flow with the FENE-P model was carried out to investigate turbulent heat transfer mechanism of polymer drag-reduced flows. The configuration was a fully-developed turbulent channel flow with uniform heat flux imposed on both walls. The temperature was considered as a passive scalar. The Reynolds number based on the friction velocity (uτ) and channel half height (δ) is 125 and Prandtl number is 5. Consistently with the previous experimental observations, the present DNS results show that the heat-transfer coefficient was reduced at a rate faster than the accompanying drag reduction rate. Statistical quantities such as root-mean-square temperature fluctuations and turbulent heat fluxes were obtained and compared with those of a Newtonian fluid flow. Budget terms of the turbulent heat fluxes were also presented.

Accelerate Iteration of Least-Squares Finite Element Method for Radiative Heat Transfer in Participating Media With Diffusely Reflecting Walls

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Wei An ◽  
Tong Zhu ◽  
NaiPing Gao
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Boundary Condition ◽  
Finite Element ◽  
Radiative Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Present Model ◽  
Participating Media ◽  
Element Method

A high reflectivity of walls often leads to prohibitive computation time in the numerical simulation of radiative heat transfer. Such problem becomes very serious in many practical applications, for example, metal processing in high-temperature environment. The present work proposes a modified diffusion synthetic acceleration model to improve the convergence of radiative transfer calculation in participating media with diffusely reflecting boundary. This model adopts the P1 diffusion approximation to rectify the scattering source term of radiative transfer equation and the reflection term of the boundary condition. The corrected formulation for boundary condition is deduced and the algorithm is realized by finite element method. The accuracy of present model is verified by comparing the results with those of Monte Carlo method and finite element method without any accelerative technique. The effects of emissivity of walls and optical thickness on the convergence are investigated. The results indicate that the accuracy of present model is reliable and its accelerative effect is more obvious for the optically thick and scattering dominated media with intensive diffusely reflecting walls.

Markov Analysis of Radiative Transfer in Specular Enclosures

1991 ◽  
Vol 113 (2) ◽  
pp. 429-436 ◽  
Author(s):  
R. L. Billings ◽  
J. W. Barnes ◽  
J. R. Howell ◽  
O. E. Slotboom
Keyword(s):  
Heat Transfer ◽  
Radiative Transfer ◽  
Markov Chains ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Previous Literature ◽  
Markov Analysis ◽  
Two Parameter

This paper is directed at the use of Markov chains in the modeling of radiative heat transfer in specular enclosures containing nonparticipating gases. Following a brief review of previous literature in that area of investigation, a two-parameter state definition is given. The analysis of general infinitely long enclosures using that definition is then discussed, and the paper concludes with a report of selected implementation results.

Modeling and analysis of 3D radiative heat transfer in combustor

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yue Zhou ◽  
Xijuan Zhu ◽  
Qisheng Guo ◽  
Pengcheng Qi ◽  
Jing Ma
Keyword(s):  
Heat Transfer ◽  
Radiative Transfer ◽  
Thermal Radiation ◽  
Numerical Method ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Radiant Energy ◽  
Radiative Properties ◽  
Direct Technique

Abstract Compared with wall emission, gas thermal radiation is much more complicated because of its nongray and volumetric property. In this paper, a numerical method is established to calculate 3D radiative heat transfer in combustor by modelling radiative transfer as well as nongray radiative properties of combustion gases. Energy exchanges caused by thermal radiation and conduction are calculated and compared in a rectangular combustor, which shows the significant role of thermal radiation in heating fuel-air mixtures and prompting internal combustion reactions. Besides, radiative heat flux on the wall is also quite obvious although a non-contacting flow case, revealing the special challenges for thermal protections brought by radiant energy. Lastly, increasing the working pressure means much more participating species in radiative transfer process and the radiative effects will be also magnified. The numerical method in this paper provides a direct technique to analyze the role of thermal radiation in complex thermochemical reactions while the application case proves the necessity of coupling a high-accuracy radiation model when simulating combustion and flame propagation.

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