【摘要】 本研究搭建了一套基于高速摄像机系统的流动沸腾两相可视化实验系统，采用去离子水为工质，对比了在入口温度为70℃、80℃和90℃，热流密度范围为200 k W·m^-2至1200 k W·m^-2时，平行直式结构散热器（SMHS）和网状孔隙微小通道散热器（RPMC）内的沸腾两相流体流动特性。实验结果表明，RPMC的沸腾两相换热性能显著优于单相流动，换热系数随入口温度增加而增加，且随热流密度增加呈现先增后减的趋势。在相同工况下，RPMC的换热系数较SMHS最高提升87.2%，且入口温度越高，总热阻越低。核态沸腾阶段，RPMC利用扰流特性和增强气化核心的能力，在低热流密度下即可破坏热边界层，热阻较SMHS最大降低16.8%。90℃入口时，随热流密度增加，网状孔隙通道内主要为弹状流和分散块状流，而平行直通道则以块状流和柱塞流为主。本研究为揭示微小通道结构散热器的流动沸腾两相机理提供了实验依据，并为高性能沸腾两相散热器设计提供理论指导。更多还原

【Abstract】 A flow boiling two-phase visualization experimental system based on a high-speed camera system is constructed in this paper.Take the deionized water as the working medium,a comparative study on the boiling two-phase fluid flow characteristics inside a Straight Minichannel Heat Sink（SMHS） and a Reticulated Pore Microchannel heat sink（RPMC） at inlet temperatures of 70℃,80℃,and 90℃,and at heat flow densities in the range of 200 kW·m^-2 to 1200 kW·m^-2 is carried out.The experimental results show that the boiling heat transfer performance of RPMC is significantly better than that of single-phase flow.The heat transfer coefficient increases with the increase in inlet temperature,but shows a trend of first increasing and then decreasing with the increase in heat flux density.Under the same working conditions,the heat transfer coefficient of RPMC is up to 87.2% higher than that of SMHS,and the higher the inlet temperature,the lower the total thermal resistance.During the nuclear boiling stage,RPMC utilizes its turbulence characteristics and enhanced vaporization core capabilities to disrupt the thermal boundary layer even at low heat flux densities,reducing thermal resistance by up to 16.8% compared to SMHS.At an inlet temperature of 90℃,as the heat flux density increases,the reticulated porous channels primarily develop slug flow and dispersed churn flow patterns,while the straight parallel channels mainly exhibit churn flow and plug flow patterns.This study will provide an experimental basis for revealing the twophase flow boiling mechanism in heat sinks with minichannel structures and guide the design of high-performance boiling two-phase flow heat sinks更多还原