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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

SECOND MOMENT MODELLING OF CONJUGATE TURBULENT HEAT TRANSFER IN POROUS MEDIA

Get access (open in a dialog) DOI: 10.1615/IHTC16.cov.022401
pages 3255-3262

Abstract

To predict conjugate turbulent heat transfer inside porous media, double (volume and Reynolds) averaged energy equations of fluid and solid phases are modelled based on the multi-scale second moment closure. Unknown correlation such as the volume averaged turbulent heat flux, dispersion heat flux, wall-heat transfer and tortuosity terms arise in the double averaged energy equations. The wall-heat transfer term is modelled considering the analogy between the flow and thermal fields. For the heat fluxes, several heat flux models such as eddy viscosity model, generalized gradient diffusion hypothesis (GGDH) and higher order GGDH model are assessed. The developed model is evaluated by comparing the large eddy simulation results of fully developed conjugate heat transfer in square rod arrays, staggered cube arrays and body centred cubic matrix foam. It is confirmed that the higher order GGDH heat flux model shows the best performance in prediction of thermal fields, and the wall-heat transfer based on the analogy to the modelling strategy of the drag term successfully works. It is found that the present model can reasonably predict the macroscopic temperature profiles of solid and fluid phases.