Numerical modeling for thermal performance augmentation of nanofluid in solar flat plate collector equipped with twisted tape

Document Type : Mechanics article

Authors

1 Msc Student, Babol Noshirvani University of Technology

2 Assistant Professor, Babol Noshirvani University of Technology

Abstract

The aim of this work is to enhance thermal performance characteristics in a solar flat plate collector with inserts typical twisted tapes and Al2O3-water nanofluid as the working fluid. Using twisted tapes make contact surface area and swirl intensity to increase. Numerical present analysis of the thermal and fluid behaviors of the tubes with twisted tapes in different arrangements has been investigated under constant heat flux condition with the Reynolds number ranging from 4000 to 20000. For numerical solution of this problem, The Fluent commercial software has been used in which Realizable k-ε turbulence model was applied. According to the tests, the numerical results show that the twisted tape inserted in a solar flat plate collector induce swirling flows which help to improve fluid mixing, therefore increasing diameter ratio (D*) and revaluation of ratio (N) enhance heat transfer rate and the other hand, the pressure drop and also the friction factor increase. The maximum thermal performance factor of 1.08 is obtained by using twisted tapes with N = 7 and D* = 0.014 at the lowest Reynolds number of 4000

Keywords

Main Subjects

References

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Journal of Modeling in Engineering
Volume 17, Issue 57
July 2019
Pages 295-313

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History

  • Receive Date: 09 October 2018
  • Revise Date: 22 December 2018
  • Accept Date: 08 January 2019

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