烧结多尺度表面与光表面池沸腾换热特性比较

Comparison of the Pool Boiling Heat Transfer on Plain and Multi-Scale Porous Coating Surfaces

本文采用可视化研究方法,在常压下,对浸没在丙酮工质中的多尺度烧结表面与纯铜光表面的沸腾传热特性进行了比较研究。结果表明,与光表面相比多尺度烧结表面核化点密集,产生的汽泡具有数量大、体积小的特点,可以显著降低沸腾起始点所需的过热度,在相同热流密度条件下,具有较好的换热效果。

High speed visualizations and thermal performance studies of pool boiling heat transfer on plain and multi-scaled sintered surface were performed at atmospheric pressure, using acetone as the working fluid. Results showed that, comparing with the plain surface, the multi-scale porous surfaces have a higher density of nucleation sites and larger quantity of bubble with smaller volume. So the multi-scale porous surfaces can decrease wall superheat at the onset of nucleate boiling. In addition, the multi-scale porous surfaces exhibit better heat transfer performance at the same heat flux.