Generation of entropy during forced convection of heat in nanofluid stagnation-point flows over a cylinder embedded in porous media

Gomari, S. R., Alizadeh, R., Alizadeh, A. and Karimi, N. (2019) Generation of entropy during forced convection of heat in nanofluid stagnation-point flows over a cylinder embedded in porous media. Numerical Heat Transfer, Part A: Applications, 75(10), pp. 647-673. (doi: 10.1080/10407782.2019.1608774)

Abstract

Thermodynamics and heat transfer of an impinging nanofluid flow upon a cylinder with constant surface temperature and embedded in porous media are investigated. Numerical solutions reveal the flow velocity and temperature fields as well as the Nusselt number. These are then used to calculate the rate of entropy generation within the system by viscous and heat transfer irreversibilities. It is demonstrated that changes in the concentration of nanoparticles modify the thermal and hydrodynamic boundary layers and hence can alter the Nusselt number and entropy generation considerably. However, the shear stress on the surface of the cylinder is observed to be less affected by the variations in the concentration of nanoparticles. Further, the Reynolds number and non-uniform transpiration are shown to affect the Nusselt number and entropy generation. It is argued that the influences of Reynolds number on the boundary layer thickness can majorly modify the irreversibility and Bejan number.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Karimi, Dr Nader
• Authors: Gomari, S. R., Alizadeh, R., Alizadeh, A., and Karimi, N.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Numerical Heat Transfer, Part A: Applications
• Publisher: Taylor and Francis
• ISSN: 1040-7782
• ISSN (Online): 1521-0634
• Published Online: 06 June 2019
• Copyright Holders: Copyright © 2019 Informa UK Limited, trading as Taylor & Francis Group
• First Published: First published in Numerical Heat Transfer, Part A: Applications 75(10):647-673
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
70976	1	Thermally Driven Heat Pump Based on an Integrated Thermodynamic Cycle for Low Carbon Domestic Heating (Therma-Pump)	Zhibin Yu	Engineering and Physical Sciences Research Council (EPSRC)	EP/N020472/1	ENG - ENGINEERING SYSTEMS POWER & ENERGY