Buoyancy induced heat transfer deterioration in vertical concentric and eccentric annuli

Forooghi, Pourya, Abdi, Iman Ashtiani, Dahari, Mahidzal and Hooman, Kamel (2015) Buoyancy induced heat transfer deterioration in vertical concentric and eccentric annuli. International Journal of Heat and Mass Transfer, 81 222-233. doi:10.1016/j.ijheatmasstransfer.2014.10.009


Author Forooghi, Pourya
Abdi, Iman Ashtiani
Dahari, Mahidzal
Hooman, Kamel
Title Buoyancy induced heat transfer deterioration in vertical concentric and eccentric annuli
Journal name International Journal of Heat and Mass Transfer   Check publisher's open access policy
ISSN 0017-9310
1879-2189
Publication date 2015
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.ijheatmasstransfer.2014.10.009
Open Access Status
Volume 81
Start page 222
End page 233
Total pages 12
Place of publication Kidlington, Oxford, United Kingdom
Publisher Elsevier
Collection year 2015
Language eng
Abstract Turbulent convection heat transfer of upward fluid flows in vertical annular channels with uniformly heated inner wall and adiabatic outer wall is investigated numerically. Two concentric geometries with outer-to-inner diameter ratios of 2.4 and 3 as well as two eccentric geometries with identical outer-to-inner diameter ratio of 2.4 and eccentricities of 0.25 and 0.5 are investigated. Heat transfer deterioration, similar to that of a circular pipe, is observed. The range of buoyancy parameter, over which deterioration is observed, is close to that of circular pipes. Moreover, it is observed that when the value of eccentricity increases, the deterioration phenomenon becomes less pronounced and recovery of heat transfer coefficient occurs earlier, i.e. at lower buoyancy parameters compared to concentric annuli.
Keyword Eccentric annuli
Heat transfer deterioration
Turbulent mixed convection
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 4 November 2014.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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