THERMAL SCIENCE

International Scientific Journal

H. Sayehvand

,

E. Khalili Dehkordi

,

A. Basiri Parsa

NUMERICAL ANALYSIS OF FORCED CONVECTION HEAT TRANSFER FROM TWO TANDEM CIRCULAR CYLINDERS EMBEDDED IN A POROUS MEDIUM

ABSTRACT
Study the heat and mass transfer in packed bed heat exchangers particularly in nuclear application is subject of many new researches. In this paper numerical analysis of forced convection heat transfer from two tandem circular cylinders embedded in a packed bed, which is made of spherical aluminum particles, is investigated in laminar flow. The porous medium increases the overall heat absorbed from two cylinders and cooling effect but increases the pressure drop, significantly. Also, the effect of increase the horizontal distance between two tandem circular cylinders on flow pattern and heat transfer is investigated. For the empty channel, the total wall heat flux in very small distances have a minimum due to generation of closed vortex region and for longer distances, by increases the distance between two tandem cylinder, the total wall heat flux increases. It is shown that for two circular cylinders embedded in the packed bed, the total wall heat fluxes from two cylinders and the fluid outlet temperature increase to a maximum quantity and then decrease with negative gradient. Also, the quantities of the empty channel are too smaller than the amounts of porous medium.
KEYWORDS
porous medium, packed bed, forced convection, two tandem cylinders, laminar flow
PAPER SUBMITTED: 2015-03-07
PAPER REVISED: 2015-04-20
PAPER ACCEPTED: 2015-05-19
PUBLISHED ONLINE: 2015-06-07
DOI REFERENCE: https://doi.org/10.2298/TSCI150307081S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 5, PAGES [2117 - 2128]
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Numerical analysis of forced convection heat transfer from two tandem circular cylinders embedded in a porous medium

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