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research-article

Analysis of Entropy Generation of a Magnetohydrodynamic Flow Through the Operation of an Unlooped Pulsating Heat Pipe

[+] Author and Article Information
Farrokh Mobadersani

Urmia University of Technology, Mechanical Engineering Department, 1.5 km of Band Road, Urmia, Iran
fmobadersani@gmail.com

Goodarz Tulabi

Urmia University, Mechanical Engineering Department, 12 km of Sero Road, Urmia, Iran
goodarz.tulabi@gmail.com

Samad Jafarmadar

Urmia University, Mechanical Engineering Department, 12 km of Sero Road, Urmia, Iran
s.jafarmadar@urmia.ac.ir

Javid Nasiri

Urmia University, Mechanical Engineering Department, 12 km of Sero Road, Urmia, Iran
j.nasiri68@yahoo.com

Amin Habibzadeh

Urmia University, Mechanical Engineering Department, 12 km of Sero Road, Urmia, Iran
a.habibzadeh@urmia.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4039215 History: Received April 10, 2017; Revised December 26, 2017

Abstract

The aim of the study is the analysis of a uniform magnetic field applying effect on flow and heat performance and entropy generation through the operation of a pulsating heat pipe. Furthermore, the impacts of different evaporator temperatures and pipe diameters have been scrutinized.For each case study, Bejan number has been derived to find the heat transfer share in entropy generation. According to the results, the performance of the oscillating heat pipe decreased by applying uniform magnetic fluid intensity increasing. Moreover,the latent and sensible heat into the pulsating heat pipe enhance because of increasing the pipe diameter, so that, the liquid slugs oscillate in high amplitudes. In addition, the entropy generation value increases with an augmentation in the value of the pipe diameter. The evaluated Bejan numbers indicate that the viscous impacts in entropy generation decreases as the pipe diameter increases. Furthermore, the results depict that the heat removing performance of pulsating heat pipe improves by increasing temperature difference between evaporator and condenser sections. The obtained results illustrate enhancement in total entropy generation. With an enhance in the value of the evaporator temperature, the Bejan number will increase, so that, this phenomenon reveals the inconsiderable role of viscous impacts in high evaporator temperatures.In order to validate the calculations, the calculated results have been compared to the previous studies which show good agreement.

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