Thermal performance enhancement of flat plate solar air heater using transverse U-shaped turbulator - A numerical study

M. S. Manjunath, R. Venkatesh, N. Madhwesh

Research output: Contribution to journalArticle

Abstract

The aim of this study is to determine the effect of U-shaped rib turbulator on the flow and heat transfer characteristics of flat plate solar air heater using two-dimensional Computational Fluid Dynamics (CFD) analysis. The analysis is carried out using the CFD software tool ANSYS Fluent 15.0 for the flow Reynolds number ranging from 9000 to 21,000. The relative pitch (P/e) of the U-shaped rib is varied as 5, 10, 25 and 40 for a fixed relative rib height of 0.0421. It is shown that the U-shaped rib augments the Nusselt number by about 1.76 times while the friction factor increased by about 1.95 times with reference to smooth duct for a relative pitch of 10 and 5 respectively. The maximum thermal enhancement factor is obtained as 1.5 for the configuration of P/e=25. A comparative analysis of U-shaped rib with circular rib reveals that the U-shaped rib turbulator is found to be more effective in providing heat transfer enhancement and has about 15% higher thermal enhancement factor as compared to circular turbulator.

Original languageEnglish
Pages (from-to)5562-5587
Number of pages26
JournalJournal of Mechanical Engineering and Sciences
Volume13
Issue number3
DOIs
Publication statusPublished - 01-01-2019
Externally publishedYes

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Computational fluid dynamics
Heat transfer
Nusselt number
Air
Ducts
Dynamic analysis
Reynolds number
Friction
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "The aim of this study is to determine the effect of U-shaped rib turbulator on the flow and heat transfer characteristics of flat plate solar air heater using two-dimensional Computational Fluid Dynamics (CFD) analysis. The analysis is carried out using the CFD software tool ANSYS Fluent 15.0 for the flow Reynolds number ranging from 9000 to 21,000. The relative pitch (P/e) of the U-shaped rib is varied as 5, 10, 25 and 40 for a fixed relative rib height of 0.0421. It is shown that the U-shaped rib augments the Nusselt number by about 1.76 times while the friction factor increased by about 1.95 times with reference to smooth duct for a relative pitch of 10 and 5 respectively. The maximum thermal enhancement factor is obtained as 1.5 for the configuration of P/e=25. A comparative analysis of U-shaped rib with circular rib reveals that the U-shaped rib turbulator is found to be more effective in providing heat transfer enhancement and has about 15{\%} higher thermal enhancement factor as compared to circular turbulator.",
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Thermal performance enhancement of flat plate solar air heater using transverse U-shaped turbulator - A numerical study. / Manjunath, M. S.; Venkatesh, R.; Madhwesh, N.

In: Journal of Mechanical Engineering and Sciences, Vol. 13, No. 3, 01.01.2019, p. 5562-5587.

Research output: Contribution to journalArticle

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