Title: Entropy generation due to a moving isothermal wavy surface in nanofluid

Authors: Ahmer Mehmood; Sajid Khan; Muhammad Saleem Iqbal

Addresses: Department of Mathematics and Statistics, International Islamic University, Islamabad 44000, Pakistan ' Department of Mathematics and Statistics, International Islamic University, Islamabad 44000, Pakistan ' Department of Mathematics and Statistics, International Islamic University, Islamabad 44000, Pakistan

Abstract: The aim of current investigation is to analyse the irreversibility phenomenon, in the presence of nanoparticles in the base fluid, in viscous flow caused by the uniform motion of a wavy plate. The utilised model for the presentation of nanofluid is the Bonjourno model in which the Brownian motion and thermophoresis effects are considered. The non-flat surface texture of the wavy plate does not allow the similarity solution to exist due to which the problem is non-similar in nature. The study of entropy generation phenomenon in such non-similar boundary layer flows is very rare in literature. An implicit finite difference scheme (the Keller-box method) is utilised to obtain the numerical solution and the results have been presented through several graphs. The impact of various controlling parameters, namely, the Brownian motion parameter, the thermophoresis parameter, wavy amplitude, Lewis number, Prandtl, and Brinkman numbers on Bejan number and entropy production number are examined. It is found that entropy production increases by increasing the concentration of nanoparticles.

Keywords: nanofluid; entropy generation; moving plate; Buongiorno model; isothermal surface; surface undulations.

DOI: 10.1504/IJEX.2019.099291

International Journal of Exergy, 2019 Vol.28 No.4, pp.317 - 332

Received: 03 Jul 2018
Accepted: 02 Dec 2018
Published online: 25 Apr 2019 *

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