Analyzing The Heat and Flow Characteristics In Spray Cooling By Using An Optimized Rectangular Finned Heat Sink

IF 1.7 4区工程技术 Q3 THERMODYNAMICS

Heat Transfer Research Pub Date : 2024-02-01 DOI:10.1615/heattransres.2024051370

Altug Karabey, Kenan Yakut

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引用次数: 0

Abstract

Rapid advancements in technology constantly keep the need for thermal systems, which have high performance, on the agenda and direct the attention of researcher-engineers to studies on improving heat transfer. The spray cooling process depends on many parameters including nozzle diameter, surface area, surface geometry, critical heat flux, mass flow, gravity, spraying angle, and surface slope. One would need results from many experiments to better analyze the spray structure. In the present study, by using the rectangular-finned heat sinks optimized for spray cooling and those called “general”, the heat and flow characteristics in spray cooling were analyzed. Water was used as the cooling fluid and the cooling fluid was atomized by using an air-supported atomized. The experiments were conducted with six air-liquid ratio (ALR) values, three different jet heights, three different spraying times, three different fin heights, and three different fin widths. The results are presented in Nusselt number-air liquid ratio (Nu-ALR) and jet thickness-jet velocity (tjet-Ujet) diagrams. It was determined that air-liquid ratio (ALR) value tended to decrease with increasing Nusselt numbers. For the determined air-liquid ratio (ALR) values, Nusselt numbers decreased as the fin height increased. It was concluded that Nusselt numbers tended to decrease in all fin widths as the air-liquid ratio (ALR) value increased. In addition, considering the parameters examined for the rectangular-finned heat sink, separate correlations were developed for Nusselt number, spray angle, and jet thickness.

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使用优化矩形鳍片散热器分析喷雾冷却中的热量和流动特性

技术的飞速发展不断将对高性能热系统的需求提上日程，并将研究人员和工程师的注意力引向了改进传热的研究。喷雾冷却过程取决于许多参数，包括喷嘴直径、表面积、表面几何形状、临界热通量、质量流、重力、喷雾角度和表面坡度。要更好地分析喷雾结构，需要许多实验结果。在本研究中，通过使用针对喷雾冷却进行了优化的矩形鳍片散热器和被称为 "一般 "的散热器，分析了喷雾冷却中的热量和流动特性。冷却液为水，冷却液通过空气支撑雾化器雾化。实验采用了六种气液比（ALR）值、三种不同的喷射高度、三种不同的喷射时间、三种不同的翅片高度和三种不同的翅片宽度。实验结果用努塞尔特数-气液比（Nu-ALR）和喷射厚度-喷射速度（tjet-Ujet）图表示。结果表明，随着努塞尔特数的增加，气液比（ALR）值呈下降趋势。对于确定的气液比 (ALR) 值，随着鳍片高度的增加，努塞尔特数也随之降低。结论是，随着气液比（ALR）值的增加，所有翅片宽度的努塞尔特数都呈下降趋势。此外，考虑到对矩形鳍片散热器进行的参数检查，还对努塞尔特数、喷射角和喷射厚度分别建立了相关关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Heat Transfer Research 工程技术-热力学

CiteScore

3.10

自引率

23.50%

发文量

102

审稿时长

13.2 months

期刊介绍： Heat Transfer Research (ISSN1064-2285) presents archived theoretical, applied, and experimental papers selected globally. Selected papers from technical conference proceedings and academic laboratory reports are also published. Papers are selected and reviewed by a group of expert associate editors, guided by a distinguished advisory board, and represent the best of current work in the field. Heat Transfer Research is published under an exclusive license to Begell House, Inc., in full compliance with the International Copyright Convention. Subjects covered in Heat Transfer Research encompass the entire field of heat transfer and relevant areas of fluid dynamics, including conduction, convection and radiation, phase change phenomena including boiling and solidification, heat exchanger design and testing, heat transfer in nuclear reactors, mass transfer, geothermal heat recovery, multi-scale heat transfer, heat and mass transfer in alternative energy systems, and thermophysical properties of materials.