Unsteady separated stagnation-point flow and heat transfer past a stretching/shrinking sheet in a copper-water nanofluid
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 19 June 2019
Issue publication date: 11 September 2019
Abstract
Purpose
The purpose of this paper is to theoretically investigate the unsteady separated stagnation-point flow and heat transfer past an impermeable stretching/shrinking sheet in a copper (Cu)-water nanofluid using the mathematical nanofluid model proposed by Tiwari and Das.
Design/methodology/approach
A similarity transformation is used to reduce the governing partial differential equations to a set of nonlinear ordinary (similarity) differential equations which are then solved numerically using the function bvp4c from Matlab for different values of the governing parameters.
Findings
It is found that the solution is unique for stretching case; however, multiple (dual) solutions exist for the shrinking case.
Originality/value
The authors believe that all numerical results are new and original, and have not been published elsewhere.
Keywords
Acknowledgements
The work on this paper was supported from the grant PN-III-P4-ID-PCE-2016-0036, UEFISCDI, Romania. The authors thank the very competent reviewers for their constructive comments which clearly enhanced the quality of the manuscript.
Citation
Roşca, N.C., Roşca, A.V. and Pop, I. (2019), "Unsteady separated stagnation-point flow and heat transfer past a stretching/shrinking sheet in a copper-water nanofluid", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 8, pp. 2588-2605. https://doi.org/10.1108/HFF-09-2018-0527
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited