First and second laws of thermodynamics analysis of nanofluid flow inside a heat exchanger duct with wavy walls and a porous insert

Akbarzadeh, M., Rashidi, S., Karimi, N. and Omar, N. (2019) First and second laws of thermodynamics analysis of nanofluid flow inside a heat exchanger duct with wavy walls and a porous insert. Journal of Thermal Analysis and Calorimetry, 135(1), pp. 177-194. (doi:10.1007/s10973-018-7044-y)

Akbarzadeh, M., Rashidi, S., Karimi, N. and Omar, N. (2019) First and second laws of thermodynamics analysis of nanofluid flow inside a heat exchanger duct with wavy walls and a porous insert. Journal of Thermal Analysis and Calorimetry, 135(1), pp. 177-194. (doi:10.1007/s10973-018-7044-y)

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Abstract

This paper investigates the combined effects of using nanofluid, a porous insert and corrugated walls on heat transfer, pressure drop and entropy generation inside a heat exchanger duct. A series of numerical simulations are conducted for a number of pertinent parameters. It is shown that the waviness of the wall destructively affects the heat transfer process at low wave amplitudes and that it can improve heat convection only after exceeding a certain amplitude. Further, the pressure drop in the duct is found to be strongly influenced by the wave amplitude in a highly non-uniform way. The results, also, show that the second law and heat transfer performances of the system improve considerably by thickening the porous insert and decreasing its permeability. Yet, this is associated with higher pressure drops. It is argued that the hydraulic, thermal and entropic behaviours of the system are closely related to the interactions between a vortex formation near the wavy walls and nanofluid flow through the porous insert. Viscous irreversibilities are shown to be dominant in the core region of duct where the porous insert is placed. However, in the regions closer to the wavy walls, thermal entropy generation is the main source of irreversibility. A number of design recommendations are made on the basis of the findings of this study.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Karimi, Dr Nader
Authors: Akbarzadeh, M., Rashidi, S., Karimi, N., and Omar, N.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Journal of Thermal Analysis and Calorimetry
Publisher:Springer
ISSN:1388-6150
ISSN (Online):1572-8943
Published Online:09 February 2018
Copyright Holders:Copyright © 2018 Akadémiai Kiadó
First Published:First published in Journal of Thermal Analysis and Calorimetry 135(1): 177-194
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
709761Thermally Driven Heat Pump Based on an Integrated Thermodynamic Cycle for Low Carbon Domestic Heating (Therma-Pump)Zhibin YuEngineering and Physical Sciences Research Council (EPSRC)EP/N020472/1ENG - ENGINEERING SYSTEMS POWER & ENERGY