测量撞击多可压缩射流的局部努塞尔特数和局部恢复因子

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2024-09-18 DOI:10.1016/j.expthermflusci.2024.111320

H.I. Shaikh , S. Siddapureddy , S.V. Prabhu

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引用次数: 0

摘要

本研究为可压缩撞击射流确定了适当的参考温度。利用测得的参考温度计算局部恢复系数。稳态薄金属箔技术用于测量目标板温度。在这项研究中，研究了马赫数（Ma）在雷诺数（Re）恒定时的影响，以及马赫数和雷诺数对传热速率的综合影响。在这两种情况下，射流到板的距离在 z/d = 5 到 12 之间变化。在第一种情况下（马赫数在恒定 Re = 20,000 条件下的影响），Ma 的变化范围为 0.15 至 0.85。在第二种情况下（马赫数和雷诺数的综合影响），Ma 的变化范围为 0.2 至 0.78，相应的 Re 变化范围为 7200 至 29000。在雷诺数不变的情况下，传热系数随着马赫数的增加而增加。在给定的马赫数和雷诺数下，热传导率随着射流到平板距离的增加而降低。在马赫数和雷诺数同时变化的情况下，恢复系数不受马赫数和喷射板间距的影响。

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Measurement of local Nusselt number and local recovery factor for impinging multiple compressible jets

In the present study the appropriate reference temperature is identified for the compressible impinging jet. Using the measured reference temperature, local recovery factor is calculated. The steady state thin metal foil technique is used for the measurement of target plate temperature. In this study, the effect of Mach number (Ma) at a constant Reynolds number (Re) and the combined effect of Mach number and Reynolds number on the heat transfer rate are investigated. For both the cases, jet-to-plate distance is varied from z/d = 5 to 12. For the first case (effect of Mach number at a constant Re = 20,000), Ma is varied from 0.15 to 0.85. In the second case (combined effect of Mach number and Reynolds number), Ma is varied from 0.2 to 0.78 and the corresponding Re variation is 7200 to 29,000. At a constant Reynolds number, the heat transfer coefficient increases with the increase in the Mach number. For a given Mach number and Reynolds number, the heat transfer rate decreases with the increase in the jet-to-plate distance. The recovery factor remains unaffected by the Mach number and jet-to-plate distance in the case of the concurrent variation of the Mach number and Reynolds number.

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.