Effect of buoyancy on turbulent convection heat transfer in corrugated channels - a numerical study

Forooghi, Pourya and Hooman, Kamel (2013) Effect of buoyancy on turbulent convection heat transfer in corrugated channels - a numerical study. International Journal of Heat and Mass Transfer, 64 850-862. doi:10.1016/j.ijheatmasstransfer.2013.05.028


Author Forooghi, Pourya
Hooman, Kamel
Title Effect of buoyancy on turbulent convection heat transfer in corrugated channels - a numerical study
Journal name International Journal of Heat and Mass Transfer   Check publisher's open access policy
ISSN 0017-9310
1879-2189
Publication date 2013-09
Sub-type Article (original research)
DOI 10.1016/j.ijheatmasstransfer.2013.05.028
Volume 64
Start page 850
End page 862
Total pages 13
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Collection year 2014
Language eng
Abstract Convection heat transfer of turbulent flow between two corrugated plates in the presence of buoyancy is numerically investigated. Three different channel geometries, with width-to-pitch ratios equal to 0.2, 0.32 and 0.5 are investigated for Reynolds numbers ranging between 2200 and 13,500. The results show that, for buoyancy-aided flows, the heat transfer decreases with Grashoff number until a certain point where it starts to recover. For buoyancy-opposed flows, heat transfer monotonically increases with Grashoff number. It is the same trend as has already been reported in the literature for vertical pipes; however, for the same Reynolds number, the critical Grashoff number at which buoyancy can affect the heat transfer in a corrugated channel is higher. These Grashoff numbers increase with the width-to-pitch ratio of the channel. If the wall heat flux (thus Grashoff number) is kept constant, Reynolds number must be 3-7 times smaller in corrugated channels with aspect ratios of 0.2-0.5, respectively, compared to a vertical pipe so that buoyancy can affect heat transfer.
Keyword Buoyancy
Corrugated channel
Convection
Heat transfer deterioration
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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