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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

RADIATION AND COMBUSTION: SOME LIKE IT HOT!

Jim Swithenbank
Department of Chemical and Process Engineering, University of Sheffield, Sheffield, United Kingdom

F. Boysan
Fluent Europe Ltd, UK

P. Langston
Sheffield University; Stone & Webster Eng Ltd, 500 Elder Gate, Central Milton Keynes, United Kingdom

F. Liu
Sheffield University

DOI: 10.1615/IHTC10.1850
pages 233-246

Abstract

This paper presents an overview of CFD modelling applications in high temperature processes. The rapidly developing discipline of Computational Fluid Dynamics (CFD) is being used to help us understand, design and operate such high temperature systems. TIle energy for these processes is usually derived directly or indirectly from fuel, and the transfer of heat, mass and momentum takes place in a very hostile environment. As applications ofCFD technology are successfully implemented, so there is growing confidence in the viability of this new engineering tool. To illustrate the current status of the discipline, some examples of CFD applications in the field of combustion and heat transfer are presented. The governing differential equations for the process being studied must be defined and solved simultaneously if the parameters in the equations are interacting. At present, this procedure can give valuable insight into the effect of design parameters on the flow field and concentrations of major species. In the case of many pollutants, the equations governing their production does not affect the flow field or concentrations of major species. TI1l\S the equations are effectively de-coupled and pollutant formation, convection and diffusion can be calculated in a post-processor. Two examples are presented:- the first shows how CFD can be used to demonstrate poor flow in the radiation shaft and in the superheater of a 40 MW coal fired travelling grate boiler; the second example shows how CFD can be used to compute the radiant and convective heat transfer contributions in a high temperature (1200 C) heat exchanger. It is stressed that the physics and chemistry of the processes being modelled must be correct if the predictions are to agree with the experimental data. Nevertheless, this is a fruitful avenue of research which is making important contributions to our society.

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