CHF determination for high-heat flux phase change cooling system incorporating both micro-channel flow and jet impingement
CHF determination for high-heat flux phase change cooling system incorporating both micro-channel flow and jet impingement
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DOI：
10.1016/j.ijheatmasstransfer.2008.07.035
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发表时间：
2009-01
影响因子：
5.2
通讯作者：
M. Sung;I. Mudawar
中科院分区：
文献类型：
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作者：
M. Sung;I. Mudawar
本文研究了结合微通道流动和射流冲击冷却特性的混合冷却模块的过冷核沸腾和临界热流密度特性。以fe -7100为工质，构建了测试模块并进行了测试。增加冷却剂的流量和/或过冷将沸腾（ONB）和CHF的开始转移到更高的热流密度和更高的壁温。混合模块产生的热流高达1127W/cm2，这是有史以来介电冷却剂在接近大气压力下实现的最高值。结果表明，混合冷却结构涉及到圆形射流与微通道流动之间复杂的相互作用，以及不同寻常的空隙率和液体速度空间变化。这些变化是通过发展均匀层模型（DHLM）确定的，在该模型中，微通道流动被描述为由沿加热壁的均匀两相层和散装液体层组成。CHF是由一种叠加技术决定的，该技术包括将加热壁分为两部分，一部分由射流冲击主导，另一部分由微通道流动主导。该技术被证明在预测混合冷却配置的CHF数据方面非常有效。
This paper explores the subcooled nucleate boiling and critical heat flux (CHF) characteristics of a hybrid cooling module that combines the cooling attributes of micro-channel flow and jet impingement. A test module was constructed and tested using HFE-7100 as working fluid. Increasing the coolant’s flow rate and/or subcooling shifted both the onset of boiling (ONB) and CHF to higher heat fluxes and higher wall temperatures. The hybrid module yielded heat fluxes as high as 1127W/cm2, which is the highest value ever achieved for a dielectric coolant at near atmospheric pressure. It is shown the hybrid cooling configuration involves complex interactions between circular jets and micro-channel flow, and unusual spatial variations of void fraction and liquid velocity. These variations are ascertained using the Developing Homogeneous Layer Model (DHLM) in which the micro-channel flow is described as consisting of a homogeneous two-phase layer along the heated wall and a bulk liquid layer. CHF is determined by a superpositioning technique that consists of dividing the heated wall into two portions, one dominated by jet impingement and the other micro-channel flow. This technique is shown to be highly effective at predicting the CHF data for the hybrid cooling configuration.