An innovative nanofluid-based cooling using separated natural and forced convection in low Reynolds flows

Raisi, A., Aminossadati, S. M. and Ghasemi, B. (2016) An innovative nanofluid-based cooling using separated natural and forced convection in low Reynolds flows. Journal of the Taiwan Institute of Chemical Engineers, 62 259-266. doi:10.1016/j.jtice.2016.02.014


Author Raisi, A.
Aminossadati, S. M.
Ghasemi, B.
Title An innovative nanofluid-based cooling using separated natural and forced convection in low Reynolds flows
Journal name Journal of the Taiwan Institute of Chemical Engineers   Check publisher's open access policy
ISSN 1876-1070
1876-1089
Publication date 2016-05
Sub-type Article (original research)
DOI 10.1016/j.jtice.2016.02.014
Open Access Status Not Open Access
Volume 62
Start page 259
End page 266
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
This article numerically studies the thermal performance of a cavity filled with the alumina-water nanofluid and with a discrete heat source at its bottom. The cavity is located on the bottom wall of a horizontal channel; and it is cooled by an external air flow entering the channel with a low Reynolds number and a temperature relatively lower than the heat source temperature. The significance of this study is the unique heat transfer mechanism due to both forced convection of main fluid in the channel and natural convection of nanofluid within the cavity without any mixing between forced and natural convection. The pertinent parameters analysed in this study are the Reynolds number of main fluid in the channel (1 ≤ Re ≤ 20), the Rayleigh number (104 ≤ Ra ≤ 107) and the solid volume fraction of alumina-water nanofluid (0 ≤ ϕ ≤ 0.04) in the cavity. A numerical model was generated to simulate the forced convection in the channel, heat conduction in the cavity walls and the natural convection in the cavity. The corresponding governing equations were solved using the SIMPLE algorithm in Fortran. The results were presented in terms of flow and temperature patterns, velocity profile at different cross-sections of the channel and the local and average Nusselt numbers. It was found that the proposed cooling method was effective in removing heat from the heat source and the heat transfer rate increased at higher Reynolds and Rayleigh numbers. It was also found that the nanofluid with a higher solid volume fraction corresponds to a higher heat transfer rate; the rate of heat transfer increase, however, was less pronounced at Ra = 105 compared to other values of Rayleigh number.
Keyword Forced convection
Natural convection
Channel
Cavity
Heat source
Nanofluid
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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