Mixed convection in vertical porous annuli

C. Y. Choi, F. C. Lai, F. A. Kulacki

Research output: Contribution to journalConference articlepeer-review

10 Scopus citations


Effects of aiding and opposing flows on buoyancy-induced convection in a vertical porous annulus have been numerically investigated. A finite heat source is located on the inner wall of the annulus which is otherwise adiabatic, and the outer wall is cooled at a constant temperature. Isothermal and constant-flux heat sources have been considered. Calculations cover a wide range of Rayleigh and Peclet numbers (10 ≤ Ra ≤ 100, and 0 ≤ Pe ≤ 100) for various radius ratios, 0 ≤ γ ≤ 10. For the present study, heat transfer results for mixed convection can be best presented in terms of two parameters Nu/Pe 1/2 · and Ra/Pe for the isothermal source and Nu/Pe 1/2 and Ra/Pe 2 for the constant flux heat source.

Original languageEnglish (US)
Pages (from-to)356-361
Number of pages6
JournalAIChE Symposium Series
Issue number269
StatePublished - Dec 1 1989
Event26th National Heat Transfer Conference - Philadelphia, PA, USA
Duration: Aug 6 1989Aug 9 1989


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