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Title: Effects of linearly heated left wall on natural convection within a superposed cavity filled with composite nanofluid-porous layers
Authors: Al-Srayyih, BM
Gao, S
Hussain, SH
First Published: 28-Oct-2018
Publisher: Elsevier
Citation: Advanced Powder Technology, 2019, 30 (1), pp. 55-72
Abstract: The effect of a linearly heated left sidewall on natural convection flows in a cavity filled with nanofluid-superposed porous layers is investigated numerically using the Galerkin finite element method. Two cases, which use the vertical and horizontal directions for the porous–nanofluid layers, are considered to investigate the natural convection in the flow inside a square enclosure. In both cases, the left wall is linearly heated, whereas the right wall is isothermally cooled. The horizontal walls are assumed to be thermally insulated. The Darcy–Brinkmann model is used to solve the governing equations in the porous layer. The results show that the nanofluid produces more enhancement of heat transfer compared to the base fluid. Increasing the Rayleigh number (Ra) values caused the intensity of the streamlines in case 2 to be stronger than that in case 1. Lower values of the thermal conductivity ratio (Kr) imply greater heat transfer enhancement than for the high thermal conductivity ratios. At the low values of the thermal conductivity ratio (Kr<1) and Darcy number values (Da < 10-3), the heat transfer is more enhanced for case 2 compared to case 1 while higher Darcy number produced case 1 overcome case 2.
DOI Link: 10.1016/j.apt.2018.10.007
ISSN: 0921-8831
eISSN: 1568-5527
Embargo on file until: 28-Oct-2019
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2018, The Society of Powder Technology Japan. After an embargo period this version of the paper will be an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Description: The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Engineering

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