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Impingement Cooling by Round Jets with a Longitudinal Swirling Strip

Kengkla Kunnarak 1, Prachya Somravysin 1, Smith Eiamsa-ard 1, and Varesa Chuwattanakul 2
1. Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
2. Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand

Abstract— The objective of this research is to study the effect of swirling impinging jet on the heat transfer in the impinged plated by using thermochromic liquid crystal (TLC) sheet. In the experiments, the nozzle having a diameter of 20 mm (D) was installed with four-channel twisted tape as a longitudinal swirling strip. The jet impingement was performed at jet-to-plate distances (L/D) of 2, 3, 4, 5, 6 and 7, and constant Reynolds number (Re) of 5000. The experimental results showed that the swirling jet induced by the four-channel twisted tape gave higher heat transfer rates than the conventional jet at the same operating conditions. The highest average heat transfer rate was obtained at the jet-to-plate distance (L/D) of 2. 

Index Terms— Heat transfer, thermochromic liquid crystal, swirling impinging jet, swirl generator

Cite: Kengkla Kunnarak, Prachya Somravysin, Smith Eiamsa-ard, and Varesa Chuwattanakul, "Impingement Cooling by Round Jets with a Longitudinal Swirling Strip," International Journal of Mechanical Engineering and Robotics Research, Vol. 7, No. 2, pp. 179-183, March 2018. DOI: 10.18178/ijmerr.7.2.179-183