NUMERICAL ANALYSIS FOR HIGH MODIFIED RAYLEIGH NUMBER NATURAL CONVECTION IN ENCLOSURES CONTAINING A POROUS MEDIUM.

Wai Cheung Timothy Tong, S. Orangi

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

7 Citations (Scopus)

Abstract

A nonuniform grid size numerical method was used to investigate steady-state natural convective heat transfer in rectangular enclosures filled with a porous material. The enclosures were considered to be two-dimensional and were assumed to have isothermal vertical and adiabatic horizontal walls. Of interest were the heat transfer characteristics in the high modified Rayleigh number regime (150 less than Ra//o less than 500). The governing equations, based on the Brinkman-extended Darcy model, were discretized using central three-point differences. The boundary-layer thickness predicted by analytical analyses were used to identify the boundary-layer and the core regions. Inside the boundary layers a grid size smaller than that in the core was employed. By doing so, numerical instabilities due to sharp gradients were avoided while the overall number of grid points required to yield sufficiently accurate results was kept minimal. Nusselt numbers are presented and when possible, comparisons with results available in the literature are made. In addition, streamline and isotherm plots are presented to illustrate the physical nature of the flow field.
Original languageEnglish
Title of host publicationHeat Transfer, Proceedings of the International Heat Transfer Conference
PublisherHemisphere Publ Corp
Pages2647-2652
Number of pages6
Volume5
ISBN (Print)0891165932
Publication statusPublished - 1 Dec 1986
Externally publishedYes
EventHeat Transfer 1986, Proceedings of the Eighth International Heat Transfer Conference. - San Francisco, CA, United States
Duration: 1 Dec 1986 → …

Conference

ConferenceHeat Transfer 1986, Proceedings of the Eighth International Heat Transfer Conference.
CountryUnited States
CitySan Francisco, CA
Period1/12/86 → …

ASJC Scopus subject areas

  • Engineering(all)

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