圆形冲击射流与平板间局部传热与平均传热的实验分析

IF 2.5 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Heat Transfer Pub Date : 2022-07-21 DOI:10.1080/08916152.2022.2099036

Laxmikant Dhruw, Hardik B. Kothadia, A. R

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引用次数: 6

摘要

实验研究了垂直于水平圆形冲击射流的加热板的传热。研究了在雷诺数为10000 ~ 45000、射流到板的距离为3 ~ 20 d、最大范围为0≤r/d≤44的情况下，射流撞击大板的面积平均传热特性和局部传热特性。在600 × 300 mm2的冲击板上，对直径为5.88 mm和11.5 mm的两种射流进行了实验。采用红外热成像方法对加热板的温度分布进行了分析。结合局部传热和区域平均传热的研究，可以很好地了解射流在板上任意位置的冷却现象。该调查在确定传热率较大的区域方面是有效的。在不同的位置，研究了努塞尔数随质量流量增加的增长。在A1 (0 < r/d < 2.17)区域内，所有雷诺数在z/d = 3时，面积平均换热最大。然而，当z/d = 6和r/d = 0时，局部努塞尔数被报道为最高。在A3区域，即r/d = 6.5时，报告了面积平均换热的减小，在此区域之外，努塞尔数剖面实际上是收敛的。

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Experimental analysis of local and average heat transfer between circular impinging jet and flat plate

ABSTRACT Heat transfer over a heated plate positioned normal to the horizontal circular impinging jet is investigated experimentally. The area average and local heat transfer characteristics over a large plate impinged by jet of air are investigated for Reynolds numbers ranging from 10,000 to 45,000, with jet-to-plate distances of 3–20 d for a maximum range of 0 ≤ r/d ≤ 44. The experiment is carried out for two jet diameters of 5.88 mm and 11.5 mm on a plate of 600 × 300 mm2 impinged by a jet. The infrared (IR) thermal imaging method is used to find the temperature distribution over the heated plate. The combined heat transfer investigation of both local and area average gives a proper insight of the cooling phenomenon of the jet at any location over the plate. The investigation is effective in identifying areas with a greater rate of heat transfer. At various locations, the Nusselt number growth with increasing mass flow rate is studied. The area average heat transfer is discovered to be the highest at z/d = 3 for all Reynolds numbers in the A1 (0 < r/d < 2.17) region. However, for z/d = 6 and r/d = 0, the local Nusselt number is reported to be the highest. Reduction in area average heat transfer is reported in area A3, i.e., r/d = 6.5, and beyond this area, the profile of Nusselt number practically converges.

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来源期刊

Experimental Heat Transfer 工程技术-工程：机械

CiteScore

6.30

自引率

37.10%

发文量

审稿时长

>12 weeks

期刊介绍： Experimental Heat Transfer provides a forum for experimentally based high quality research articles and communications in the general area of heat-mass transfer and the related energy fields. In addition to the established multifaceted areas of heat transfer and the associated thermal energy conversion, transport, and storage, the journal also communicates contributions from new and emerging areas of research such as micro- and nanoscale science and technology, life sciences and biomedical engineering, manufacturing processes, materials science, and engineering. Heat transfer plays an important role in all of these areas, particularly in the form of innovative experiments and systems for direct measurements and analysis, as well as to verify or complement theoretical models. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. All peer reviews are single blind and submission is online via ScholarOne Manuscripts. Original, normal size articles, as well as technical notes are considered. Review articles require previous communication and approval by the Editor before submission for further consideration.