Ultra-high-flux passive cooling enabled by a sweating-inspired hygroscopic membrane  

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作  者:Zengguang Sui Fuxiang Li Yunren Sui Haosheng Lin Wei Wu 

机构地区:[1]School of Energy and Environment,City University of Hong Kong,Hong Kong,China [2]City University of Hong Kong Shenzhen Research Institute,Shenzhen,China

出  处:《Carbon Energy》2025年第2期13-23,共11页碳能源(英文)

基  金:National Natural Science Foundation of China,Grant/Award Number:52322812;Shenzhen Science and Technology Program,Grant/Award Number:JCYJ20230807114905012;Research Grants Council of Hong Kong,Grant/Award Numbers:CityU 11215621,CityU 11218922。

摘  要:Passive thermal management in electronics has disadvantages of low efficiency and high cost.Herein,experimental and numerical studies on the geometric optimization of a hygroscopic-membrane heat sink(HMHS)are conducted.The HMHS is based on water evaporation from a membrane-encapsulated hygroscopic salt solution,in which pin fins are used for thermal conductivity enhancement.A comprehensive heat and mass transfer model is developed and validated.To obtain the HMHS configuration with the maximum cooling performance,an approach that couples the Taguchi method with numerical simulations is utilized.The contribution ratio of each design factor is determined.Experimentally validated results demonstrate that the maximum temperature reduction provided by the HMHS can be further improved from 15.5℃to 17.8℃after optimization,achieving a temperature reduction of up to 21℃at a fixed heat flux of 25kW/m^(2)when compared with a similarly sized fin heat sink.Remarkably,the optimized HMHS extends the effective cooling time by∼343%compared with traditional phase-change materials,achieving a maximum temperature reduction ranging from 7.0℃to 20.4℃.Meanwhile,the effective heat transfer coefficient achieved is comparable with that of forced liquid cooling.Our findings suggest that the proposed cooling approach provides a new pathway for intermittent thermal management,which is expected to be used for thermal regulation of electronics,batteries,photovoltaic panels,and LED lights.

关 键 词:ELECTRONICS hygroscopic solution MEMBRANE optimization passive thermal management Taguchi method 

分 类 号:TK124[动力工程及工程热物理—工程热物理]

 

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