摘要
对喷涂多孔表面沸腾传热进行了实验研究 ,喷涂多孔表面有三种厚度 ,采用蒸馏水、乙醇和R 113作实验工质 ,实验在当地大气压下进行 .实验结果表明 :喷涂多孔表面上产生沸腾的起始过热度低 ,传热系数比光滑表面高 2～ 5倍 .喷涂多孔表面沸腾临界热流也比光表面高 ,可以在比较宽的热流范围内强化沸腾换热 .实验还表明 :喷涂多孔表面也具有沸腾滞后现象 ,但是 ,滞后过热度较小 .喷涂技术不仅具有设备简单、操作方便、费用低等优点 ,还具有能够适应不同基体表面形状的特殊优点 .因此 。
Boiling heat transfer on the flame spraying porous surface was experimentally studied.The tested spraying porous layers were made of gear bronze with three different thickness.Distilled water,ethyl alcohol and R?113 were used as working liquids.The experimental was performed at the saturated temperature under local atmospheric pressure.The experimental results show that for such porous layer,the wall superheat required to initiate boiling is low,the boiling heat transfer coefficient can be higher than that of smooth plane surface by about twofold to fivefold.At the same time,the critical heat flux of such spraying porous layer is also higher than that of smooth plane,and it can enhance the boiling heat transfer within wide heat flux range.The experiment also reveals that the boiling hysteresis is not serious.The spraying technique not only has the advantages of simple equipment,convenient operation and low cost,but also can be suited for irregular base surface with complex geometry shapes.So,the spraying porous surface is a promising type of wick structure for heat pipe and vapor chamber.
出处
《南京师范大学学报（工程技术版）》
CAS
2001年第3期12-16,共5页
Journal of Nanjing Normal University(Engineering and Technology Edition)
关键词
喷涂多孔表面
沸腾传热
临界热流
沸腾滞后
spraying porous surface,boiling heat transfer,critical heat flux,boiling hysteresis
