Heat transfer and entropy generation of turbulent forced convection flow of nanofluids in a heated pipe

Saha, G. and Paul, M. C. (2015) Heat transfer and entropy generation of turbulent forced convection flow of nanofluids in a heated pipe. International Communications in Heat and Mass Transfer, 61, pp. 26-36. (doi: 10.1016/j.icheatmasstransfer.2014.11.007)

Abstract

Eulerian–Eulerian multi-phase mixture model is applied to numerically analyse the turbulent flow and heat transfer behaviour of water based Al₂O₃ and TiO₂ nanofluids in a pipe. The main goal of the present work is to investigate the effects of volume concentrations, Brownian motion and size diameter of nanoparticles on the flow and heat transfer. Analysis of entropy generation is presented in order to investigate the condition that optimises the thermal system. Results reveal that small diameter of nanoparticles with their Brownian motion has the highest heat transfer rate as well as thermal performance factor for χ = 6%. Above all, the higher heat transfer rate is found while using the multi-phase model than the single-phase model (Saha and Paul [1]). Also, the optimal Reynolds number is found to be <i>Re</i> = 60 × 10³ for χ = 6% and <i>d</i>_p = 10 nm, which minimises the total entropy generation. Finally, it is showed that TiO₂–water nanofluid is the most energy efficient coolant than Al₂O₃–water nanofluid, and some new correlations have been proposed for the calculation of average Nusselt number.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Saha, Mr Goutam and Paul, Professor Manosh
• Authors: Saha, G., and Paul, M. C.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: International Communications in Heat and Mass Transfer
• Publisher: Elsevier Ltd.
• ISSN: 0735-1933
• ISSN (Online): 1879-0178
• Copyright Holders: Copyright © 2014 Elsevier Ltd.
• First Published: First published in International Communications in Heat and Mass Transfer 61:26-36
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.