张宇鸿,李佳琦,张嘉懿,金梦丽,蒋乐怡,范利武,俞自涛

• 1:浙江大学热工与动力系统研究所
• 2:浙江大学能源清洁利用国家重点实验室

摘要(Abstract)：

增加表面亲水性是强化淬火过程沸腾传热、提高淬火速率的有效途径,对工程应用中实现高温物体的快速冷却具有重要意义。通过电化学阴极沉积的方法,在不锈钢柱体表面沉积金属镍颗粒,制备了一种具有较规整三维结构的微多孔超亲水表面。对其在常压饱和去离子水中进行淬火试验,研究其瞬态池沸腾传热特性,并与光滑亲水表面及微粗糙超亲水表面进行对比。结果表明,微多孔表面加快了淬火进程,冷却时间较亲水表面和无孔超亲水表面分别缩短约52%和22%。微多孔表面的临界热流密度较亲水表面提高了33%,但与超亲水表面相比却略有降低。多孔结构的存在产生了"肋片效应",使得表面局部冷却,突起的孔壁更易"刺穿"汽膜,从而使得微多孔表面的Leidenfrost温度较亲水表面与超亲水表面分别提高了约300和190℃。该表面所具有的较强芯吸性也改善了液体对于表面蒸干区域的再润湿能力,加速淬火过程中膜态沸腾向过渡沸腾的转变。

关键词(KeyWords)： 微多孔表面;淬火;池沸腾传热;超亲水表面;芯吸性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51206142)

作者(Author): 张宇鸿,李佳琦,张嘉懿,金梦丽,蒋乐怡,范利武,俞自涛

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