柴永志,张伟,赵亚东,李亚

• 1:华北电力大学能源动力与机械工程学院
• 2:低品位能源多相流与传热北京市重点实验室

摘要(Abstract)：

为揭示润湿性对微纳复合结构表面池沸腾传热的影响,采用电刷镀工艺和表面改性技术在紫铜表面制备了接触角分别为6.5°和148.6°的超亲水性和超疏水性微纳复合结构,通过实验对比研究了不同表面的饱和池沸腾传热特性,结果表明:(1)超亲水性和超疏水性微纳复合结构的最大换热系数较光表面分别提高了3倍和1.5倍;(2)在q<580k W×m~(-2)的低热流密度区,超疏水性微纳复合结构的换热系数最大;当q>580 k W×m~(-2)时,超亲水性微纳复合结构的传热性能开始优于超疏水性微纳复合结构;(3)超亲水性微纳复合结构表面的临界热流密度较光表面和超疏水性微纳复合结构分别提高了110%与60%;微纳复合结构显著增加了受热表面的气泡核化密度,而亲水性微纳复合结构的毛细吸液能力要显著强于疏水性微纳复合结构,是临界热流密度增大的主要机理。

关键词(KeyWords)： 沸腾换热;润湿性;微纳复合结构;电刷镀;临界热流密度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51476057);; 中央高校基本科研业务费专项资金(2015MS47)

作者(Author): 柴永志,张伟,赵亚东,李亚

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