Hydrodynamic heat transfer localization in impinging gas jet

V. V. Lemanov, V. V. Lukashov, K. A. Sharov

S.S. Kutateladze Institute of Thermophysics, Siberian Division of the Russian Academy of Sciences, Novosibirsk, Russia

Abstract: The results of an experimental study of heat transfer in an impinging air jet flowing from a long round channel in the range of Reynolds numbers 250–10000 are presented. Data on local heat transfer in the region of the flow stagnation point at large distances to the barrier ($h/d$ = 20) were obtained. It is shown that a more localized heat flow corresponds to a laminar flow in a jet source compared to the case of a turbulent regime in the source. The maximum heat transfer is achieved not for the Poiseuille profile in the channel, but in the case of a transition regime with a small percentage of turbulent vortex structures.

Keywords: impinging jet, heat transfer, laminar-turbulent transition, vortex structure.

Received: 08.08.2023
Revised: 29.11.2023
Accepted: 29.11.2023

DOI: 10.61011/PJTF.2024.05.57183.19704

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