Heat Transfer Visualization of Swirling Impinging Jets Using Nozzle with Centrally Hollow Helical-Tape

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ISSN: 2278-0149 (Online)
Abbreviated Title: Int. J. Mech. Eng. Robot. Res.
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DOI: 10.18178/ijmerr
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Home > Published Issues > 2020 > Volume 9, No. 5, May 2020 >

Smith Eiamsa-ard 1, Kengkla Kunnarak 1, Khwanchit Wongcharee 1, and Varesa Chuwattanakul 2

1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok, Thailand
2. Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand

Abstract— The present research was conducted to determine the heat transfer visualization of swirling impinging jets (SIJs) induced by nozzle with centrally hollow helical-tape using a thermochromic liquid crystal (TLC) sheet. The effects of jet-to-plate spacing ratios (L/D= 2.0, 4.0, 6.0 and 8.0) and Reynolds numbers (10,000  Re  20,000) on the radial uniformity and intensity of convective heat transfer were investigated. The experimental results of SIJs were compared with those of conventional impinging jets (CIJs). The formation of swirl flow of swirling impinging jet (SIJs) helped in improving the uniformity of local heat transfer or Nusselt number (Nu) and also average Nusselt number, as compared to those of conventional impinging jets (CIJs). Furthermore, the average Nusselt number (Nu) increased as jet-to-plate spacing ratio (L/D) decreased while Reynolds number (Re) increased for both conventional impinging jets (CIJs) and swirling impinging jets (SIJs). The highest Nusselt number (Nu) of swirling impinging jet (SIJ) was obtained at the jet-to-plate spacing ratio (L/D) of 4.0 and Reynolds number (Re) of 20,000. The maximum Nusselt number (Nu) of swirling impinging jet (SIJ) was higher than that of conventional impinging jets (CIJs) at similar conditions by around 5.3%.

Index Terms— Heat transfer, centrally hollow helical-tape, swirl flow, swirling impinging jet

Cite: Smith Eiamsa-ard, Kengkla Kunnarak, and Khwanchit Wongcha, and Varesa Chuwattanakul, "Heat Transfer Visualization of Swirling Impinging Jets Using Nozzle with Centrally Hollow Helical-Tape," International Journal of Mechanical Engineering and Robotics Research, Vol. 9, No. 5, pp. 673-678, May 2020. DOI: 10.18178/ijmerr.9.5.673-678

Copyright © 2020 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.