平行小通道直冷板传热特性实验研究  

Experimental Study on Heat Transfer Characteristics of a Parallel Mini-channel Direct Cooling Plate

作　　者：胡凌韧 方奕栋[1,2] 杨文量 徐丹 苏林 李康[1,2] Hu Lingren;Fang Yidong;Yang Wenliang;Xu Dan;Su Lin;Li Kang(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai,200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《制冷学报》2021年第3期87-92,共6页Journal of Refrigeration

摘　　要：作为两相冷却技术的核心部件,直冷板的传热特性越来越受到关注。本文基于泵循环两相流实验系统,设计了一块平行小通道直冷板,直冷板流道区域尺寸为140 mm×50 mm,包含21根通道,通道截面尺寸为1.5 mm×1.5 mm,通道间由0.5 mm厚的肋片分隔。通过改变制冷剂进口温度、流量以及热流密度,分析平行小通道直冷板流道内部不同区域壁面温度及表面传热系数的变化规律。结果表明,制冷剂热流密度0.5 W/cm^(2)、进口温度15℃、质量流量150 kg/h时,不同流道内壁面温度均沿流动方向呈单调上升趋势;当制冷剂热流密度升至6 W/cm^(2),壁面温度先升高后趋于稳定,中间流道的壁面温度均高于周边流道。在低热流密度下,直冷板流道内部不同位置的表面传热系数沿流动方向基本不变;而在高热流密度下,流道出口处的表面传热系数呈现上升的趋势,最大增幅为21%。与壁面温度相似,周边流道的表面传热系数高于中间流道,表面传热系数相差7%~24%。As a key part of two-phase cooling systems,direct cooling plates have received increasing attention with the development of two-phase cooling technology.A parallel mini-channel direct cooling plate was designed based on the experimental system of pumped two-phase cooling.The channel area of the cold plate was 140 mm long and 50 mm wide,having 21 parallel mini-channel,each 1.5 mm×1.5 mm,separated by a fin with a thickness of 0.5 mm.The heat transfer characteristics of a parallel mini-channel direct cooling plate under different refrigerant inlet temperatures,flow rates,and heat fluxes were investigated.The variations in the local wall temperatures and heat transfer coefficients in different regions of the cooling plate were analyzed.The results indicate that when the heat flux is 0.5 W/cm^(2),the inlet temperature of the refrigerant is 15℃the flow rate is 150 kg/h,and the wall temperatures in different channels rise monotonously along the flow direction.After the heat flux was increased to 6 W/cm^(2),the wall temperature first increased along the flow direction and then stabilized at a certain value.The wall temperatures of the middle channel were higher than those of the peripheral channel.The local heat transfer coefficient shows little variation under low heat flux,while an increase along the flow direction can be observed near the outlet of the mini channel under higher heat flux owing to the nucleate boiling,and the maximum increase in the heat transfer coefficient was 21%.Similar to the wall temperatures,the local heat transfer coefficient of the peripheral channel is higher because of the more intense flow boiling,with a maximum increase of 24%.

关 键 词：两相冷却 沸腾传热 平行小通道 直冷板 

分 类 号：TB611[一般工业技术—制冷工程] TK172[动力工程及工程热物理—热能工程]