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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 2295–2303 | Cite as

Nanofluid heat transfer and entropy generation through a heat exchanger considering a new turbulator and CuO nanoparticles

  • M. Sheikholeslami
  • M. Jafaryar
  • Ahmad Shafee
  • Zhixiong LiEmail author
Article
  • 63 Downloads

Abstract

In this research, a numerical macroscopic approach has been employed to analyze nanofluid entropy generation and turbulent flow through a circular heat exchanger with an innovative swirl flow device. A homogenous model was considered for nanofluid. Minimizing entropy generation can be considered as a very important goal for designing a heat exchanger, so we focus on this factor in the present attempt. Simulations were presented to show the influences of the geometric parameter (revolution angle) and inlet velocity on hydrothermal and second-law treatment. Related correlations for thermal and frictional entropy parameters as well as Bejan number have been presented. Outputs reveal that augmenting revolution angle increases the frictional entropy generation. Increasing secondary flows leads to a reduction in thermal entropy generation due to a decrement in thermal boundary layer thickness. By improving convective flow, Bejan number reduces.

Keywords

Nanofluid Heat transfer Passive technique Heat exchanger Entropy generation 

List of symbols

\(S_{\text{gen,f}}\)

Viscous entropy generation

Nu

Nusselt number

T

Fluid temperature

Re

Reynolds number

P

Pressure

L

Length of pipe

f

Darcy friction factor

Pr

Prandtl number

\(S_{\text{gen,th}}\)

Thermal entropy generation

D

Pipe diameter

Greek symbols

\(\alpha\)

Thermal diffusivity

\(\phi\)

Concentration of nanofluid

\(\mu\)

Dynamic viscosity of nanofluid

ρ

Density

β

Revolution angle

Subscripts

s

Particles

nf

Working fluid

f

Fluid

Notes

Acknowledgements

This article was supported by the National Sciences Foundation of China (NSFC) (No. U1610109), UOW Vice-Chancellor’s Postdoctoral Research Fellowship. Also, the authors acknowledge the funding support of Babol Noshirvani University of Technology through Grant program No. BNUT/390051/97.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • M. Sheikholeslami
    • 1
    • 2
  • M. Jafaryar
    • 2
    • 3
  • Ahmad Shafee
    • 4
    • 5
  • Zhixiong Li
    • 6
    • 7
    Email author
  1. 1.Department of Mechanical EngineeringBabol Noshirvani University of TechnologyBabolIslamic Republic of Iran
  2. 2.Renewable Energy Systems and Nanofluid Applications in Heat Transfer LaboratoryBabol Noshirvani University of TechnologyBabolIran
  3. 3.MR CFD LLCTbilisiGeorgia
  4. 4.FASTUniversity Tun Hussein Onn MalaysiaParit Raja, Batu PahatMalaysia
  5. 5.Applied Science Department, College of Technological StudiesPublic Authority of Applied Education and TrainingShuwaikhKuwait
  6. 6.School of EngineeringOcean University of ChinaQingdaoChina
  7. 7.School of Mechanical, Materials, Mechatronic and Biomedical EngineeringUniversity of WollongongWollongongAustralia

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