Numerical Heat Transfer Investigation in a Solar Receiver Heat Exchanger Channel with Punched Elliptical-Winglet Vortex Generators

Authors

  • Pitak Promthaisong Mahasarakham University
  • Pongjet Promvonge King Mongkut’s Institute of Technology Ladkrabang
  • Chitakorn Khanoknaiyakarn King Mongkut’s University of Technology North Bangkok Rayong Campus
  • Sompol Skullong Kasetsart University Sriracha Campus

DOI:

https://doi.org/10.4186/ej.2021.25.10.105

Keywords:

elliptical-winglet, heat exchanger, vortex generator, flow resistance, thermal performance

Abstract

Thermal performance in a solar receiver heat exchanger (SRX) channel with punched elliptical-winglet vortex generator (P-EW) mounted on the absorber plate is numerically examined for Reynolds number (Re) ranging from 4000 to 24,000. In the present simulation, the P-EW characteristics included three ratios of winglet pitches (PR = 2.0, 1.5 and 1.0) including four sizes of the perforated-holes (nondimensional hole diameter, dR= 0.0, 0.25, 0.417 and 0.583) at one value of the attack angle (a =30°) and relative height (BR= 0.48). The computation reveals that employing P-EW generally yields considerably large friction factor (f) and Nusselt number (Nu) than the flat-plate channel alone. The use of smaller hole size causes the rise in Nu and f. It is noticeable that counter-spinning vortices pairs generated by the multiple P-EW can induce the impinging flow onto the absorber plate together with the air jet coming out of the hole, leading to the rise in the heat transfer rate greater than the smooth flat-plate channel. The highest thermal performance of about 1.9 was seen for the one with PR = 1.5 and dR = 0.417.

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Author Biographies

Pitak Promthaisong
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Heat Pipe and Thermal Tool Design Research Unit (HTDR), Faculty of Engineering, Mahasarakham University, Maha Sarakham 44150, Thailand

Pongjet Promvonge
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Department of Mechanical Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand

Chitakorn Khanoknaiyakarn
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Division of Mechanical and Automotive Engineering Technology, Faculty of Engineering and Technology, King Mongkut’s University of Technology North Bangkok Rayong Campus, Rayong 21120, Thailand

Sompol Skullong
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Energy Systems Research Group and ATAE Research Unit, Department of Mechanical Engineering, Faculty of Engineering at Sriracha, Kasetsart University Sriracha Campus, 199 M.6, Sukhumvit Rd., Sriracha, Chonburi 20230, Thailand

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Published In
Vol 25 No 10, Oct 31, 2021
How to Cite
[1]
P. Promthaisong, P. Promvonge, C. Khanoknaiyakarn, and S. Skullong, “Numerical Heat Transfer Investigation in a Solar Receiver Heat Exchanger Channel with Punched Elliptical-Winglet Vortex Generators”, Eng. J., vol. 25, no. 10, pp. 105-114, Oct. 2021.
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