EFFECT OF RIB HEIGHT ON HEAT TRANSFER ENHANCEMENT BY COMBINATION OF A RIB AND PULSATING FLOW
EFFECT OF RIB HEIGHT ON HEAT TRANSFER ENHANCEMENT BY COMBINATION OF A RIB AND PULSATING FLOW
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DOI：
10.5098/hmt.18.29
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发表时间：
2022-05
影响因子：
1.8
通讯作者：
T. Fukue;Shintaro Hayakawa;Y. Sugimoto;Wakana Hiratsuka;H. Shirakawa;Yasushi Koito
中科院分区：
文献类型：
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作者：
T. Fukue;Shintaro Hayakawa;Y. Sugimoto;Wakana Hiratsuka;H. Shirakawa;Yasushi Koito
本文介绍了肋和脉动流的组合对传热强化的影响，在一个mm尺度的模型，模拟缩小尺寸的电子设备的冷却装置中的狭窄的流动通道。本研究旨在开发一种新型的水冷却装置，提高传热性能，同时抑制泵浦功率。我们最近的研究表明，脉动流和肋的组合可以相对于简单的管道提高传热性能。在本研究中，为了验证通过脉动流来改善传热的最佳肋高度，我们通过三维计算流体动力学（CFD）分析来评估脉动流的传热性能与肋高度之间的关系。计算了冷却性能指数η，以评价脉动流相对于稳态流的传热性能的改善。较高高度的肋有助于实现更高的传热性能，而不管流量脉动如何。然而，压力降也显着增加，并通过更高的肋的传热增强的水平是依赖于时间平均雷诺数。通过对冷却性能指标的评价，明确了在抑制压降增加的同时，强化传热的最佳肋高。
This paper describes the effects of a combination of rib and pulsating flow on heat transfer enhancement in an mm-scale model that simulates the narrow flow passages in cooling devices of downsized electronic equipment. This research aims to develop a novel water cooling device that increases heat transfer performance while inhibiting pumping power. Our recent study has reported that a combination of pulsating flow and rib could enhance heat transfer performance relative to the simple duct. In the present study, to verify the optimal rib height for improving heat transfer by pulsating flow, we evaluated the relationship between heat transfer performance of pulsating flow and rib height through three-dimensional computational fluid dynamics (CFD) analysis. The cooling performance index was calculated to evaluate the improvement of the heat transfer performance of pulsating flow relative to a steady flow. Higher height ribs help to achieve higher heat transfer performance regardless of the flow pulsation. However, pressure drop also increases significantly, and the level of the heat transfer enhancement by the higher ribs is dependent on the time-averaged Reynolds number. By evaluating the cooling performance index, we clarified the optimum rib height that can enhance heat transfer while inhibiting the increase of the pressure drop.