PFA疏水曲面沸腾汽膜输运过程及传热研究Study on the transport process and heat transfer of boiling vapor film on PFA hydrophobic surface
汪嘉辉,郑毅,马学虎
摘要(Abstract)：
石油产品是全球必需能源，在全球的需求量日益增大。与此同时，化工厂中液化天然气(LNG)的储存问题也越来越受关注，其中沸腾液体膨胀蒸汽爆炸(BLEVE)是化工厂中最常见的事故，而降低沸腾传热系数(HTC)可有效预防BLEVE事故的发生。相较于亲水表面，疏水表面具有疏水亲汽的特性，使汽泡易于在低热通量下连结成膜，降低HTC。基于表面润湿性原理，将化工厂中不同尺寸球罐等比缩小，研究了不同曲率可熔性聚四氟乙烯(PFA)疏水曲面沸腾过程，结合传热数据和可视化图片将其与光滑铜曲面进行对比。研究结果表明：喷涂了PFA疏水涂层的曲面的临界热流密度(CHF)和HTC显著降低，其中曲率为35~(-1)、47~(-1)、80~(-1)、120~(-1) mm~(-1)的4种PFA疏水曲面圆心角0°处最高的HTC相较于光滑曲面分别降低了59.5%、80.7%、61.4%、60.0%。
关键词(KeyWords)： 沸腾液体膨胀蒸汽爆炸;传热系数;临界热流密度;曲面沸腾
基金项目(Foundation): 国家自然科学基金（22478050）
作者(Author): 汪嘉辉,郑毅,马学虎
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