Imperial College London
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ProfessorStephenNeethling

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Minerals Processing
 
 
 
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Contact

 

+44 (0)20 7594 9341s.neethling

 
 
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Location

 

RSM 2.35Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Avalos:2021:10.1016/j.ijheatmasstransfer.2021.121452,
author = {Avalos, Patino J and Dargaville, S and Neethling, S and Piggott, M},
doi = {10.1016/j.ijheatmasstransfer.2021.121452},
journal = {International Journal of Heat and Mass Transfer},
pages = {1--16},
title = {Impact of inhomogeneous unsteady participating media in a coupled convection-radiation system using finite element based methods},
url = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121452},
volume = {176},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Combined convection–radiation is a common phenomenon in many engineering problems. A differentially–heated rectangular enclosure is a widely–used benchmark for testing numerical techniques developed for solving the coupled momentum and energy equations related to combined convection–radiation. Previous studies have tended to describe the phenomenon in cases using simplified characteristics for the participating media including the assumptions of: (i) uniform distribution, (ii) homogeneous cross section, (iii) grey gas radiation and (iv) under steady state conditions. The effects of an inhomogeneous unsteady participating media, e.g. composed of a mixture of gases, are arguably understudied. In this work the effect of an inhomogeneous unsteady participating media on combined convection–radiation inside a rectangular enclosure is considered, under both grey and non-grey gas modelling approaches involving a mixture of gases. A key novelty in this work is the inclusion of the ability to handle inhomogeneous participating media which change in space, time and absorption cross section values as a result of the convection–radiation coupling, allowing us to assess different gas modelling approaches. A global gas radiation model is used and a new non–uniform discretisation method for the absorption distribution function is introduced; this method allows a better handling of those energy groups in which the Planck absorption coefficient is low, improving the performance of the spherical harmonics method and mitigating ray–effects on finite elements in angle discretisation. The momentum and energy equations are solved numerically using finite element based discretisation methods. The radiative transfer equation is solved numerically using both spherical harmonics and finite elements for the angular discretisation, with their relative performance compared. The results highlight the importance that the characteristics of the partic
AU  - Avalos,Patino J
AU  - Dargaville,S
AU  - Neethling,S
AU  - Piggott,M
DO  - 10.1016/j.ijheatmasstransfer.2021.121452
EP  - 16
PY  - 2021///
SN  - 0017-9310
SP  - 1
TI  - Impact of inhomogeneous unsteady participating media in a coupled convection-radiation system using finite element based methods
T2  - International Journal of Heat and Mass Transfer
UR  - http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121452
UR  - https://www.sciencedirect.com/science/article/pii/S001793102100555X?via%3Dihub
UR  - http://hdl.handle.net/10044/1/88647
VL  - 176
ER  -
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