Effect of Interference of Impinging Round Jets on the Cooling Intensity of Heat Transfer Surfaces

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发表日期：

2025年6月1日

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M. V. Philippov,
I. A. Chokhar,
V. V. Terekhov,
A. I. Fedorchenko,
V. I. Terekhov

摘要

Abstract

Impinging round parallel jets are one of the simplest and mostefficient tools of heat and mass transfer enhancement and they areapplied in cooling electronic equipment, gas turbine blades,combustion chamber walls, etc. As a rule, these devices use asystem of jets. One of the simple ways to study the interaction ofa jet array is to study the interaction between two jets. However,even with this approach, there are a large number of parametersthat affect the process of jet interaction: the distance betweenthe jets, the ratio of diameters, the ratio of flow rates, etc.,and this greatly complicates the description of characteristics ofthe interaction of turbulent jets with each other and with thesurface. Moreover, in a jet array, each jet is surrounded by atleast two jets, so in this work we investigated heat transfer oftwo- and three-jet cooling and looked for differences betweenthem. In the experiments, the distances between the jets and fromthe nozzle to the surface were varied. Local heat transfercharacteristics were analyzed using infrared thermography. It wasfound that at distance s/D \(=\) 1.2, the distribution of local Nufor the three-jet interaction differs significantly from thetwo-jet interaction, however, at s/D \(=\) 1.8, there are almost novisible distinguishing characters.