379-多孔微通道流动沸腾换热特性.pdfVIP

多孔微通道流动沸腾换热特性 *1 1 1 1 1 1 张东辉 ，周志平 ，周丽 ，吴明发 ，沈艳琳 ，王剑桥 （江苏科技大学能源与动力工程学院，江苏镇江212003） （ TelEmail:2554304973@） 摘 要：多孔微通道以去离子水为工质，探讨多孔微通道结构参数、工质过冷度和流量 对沸腾换热性能和流动不稳定性进行研究，并与普通微通道进行了对比研究。多孔微通道的 烧结粒径分别为 30 μm、50 μm、90 μm 底厚为 200 μm 和 400 μm，工质质量流率范围是 71-213kg/m2 ·s，工质入口温度为60℃和80℃。详细探索多孔微通道结构参数的具体影响。 研究发现：多孔微通道最优的厚度粒径比为2-5，粒径90 μm、底厚200 μm、400 μm 与粒径 50 μm、底厚200 μm 的多孔微通道换热性能提升最为显著，换热系数最高为铜基微通道的5 倍。多孔微通道壁面过热度都小于铜基微通道，换热系数在中高热流密度时随质量流率增加 逐渐增大。 关键词：多孔微通道；两相流；流动沸腾；换热 Porous Microchannel Flow Boiling Heat Transfer Characteristics DonghuiZhang ，ZhipingZhou ，JianqiaoWang ，MingfaWu ，YanlinShen ，Li Zhou ， (School of Energy and Power Engineering ，Jiangsu University of Science and Technology ，Zhenjiang 212003 ，Jiangsu ，China) （Tel， Email:2554304973@ ） Abstract: The porous microchannels were studied by using deionized water as the working fluid. The parameters of the microchannel structure, the undercooling degree of the working fluid and the flow rate were studied and compared with the ordinary microchannels.The sintered particle size of the porous microchannel is 30 μm, 50 μm, 90 μm base thickness is 200 μm and 400 μm, the mass flow rate is 71-213kg/m2 ·s, the working fluid inlet temperature is 60℃and 80℃. Detailed exploration of porous microchannel structure parameters of the specific impact. It is found that the porous microchannel has the best thickness ratio of 2-5, particle size 90 μm, bottom thickness 200 μm,400 μm and particle size 50 μm, the bottom thickness of 200 μm porous microchannel heat transfer performance is most significant, the highest heat transfer coefficient 5 times the copper-based microchannel. The superheat of the porous microchannels is smaller than that of the copper-based microchannels. The heat tr