Study of the Flow and Heat Transfer of Pulsed Sinusoidal Impinging Jet at Distances Close To the Concave Surface

Document Type : Research Article

Authors

Department of Mechanical Engineering, Semnan University

Abstract

The main purpose of this study is to investigate the effect of the pulsating of the inlet jet on the heat transfer rate short distances of the nozzle from the concave surface. For this purpose, three-dimensional simulation of flow and heat transfer of sinusoidal pulsed jets on the concave surface has been performed at distances of 0.5 times of nozzle diameter to 4 and for Reynolds numbers of 7000 and 14000. The results of the numerical simulation are in good agreement with the experimental results of the steady jet. The result shows that the effect of pulsating the flow with the sine function decreases at short distances between the jet and the concave surface. So that at a distance of 4 times of nozzle diameter, pulsating jet led to a 10% increase in the average Nu, while this value is equal to 5% for a distance of 0.5 times of nozzle diameter. It can be found that pulsating the flow decreases Nu at low frequencies, and then with increasing the frequency of the pulsed jet, the Nu number increases. Furthermore, with increasing the distance between the surface and the inlet jet, the Nu number decreases significantly. This rate of reduction is lower in comparison to the steady jet.

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Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 9
December 2021
Pages 4943-4960

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