多孔泡沫吸气板调控沸腾气泡动力学实验研究  

Experimental study on boiling dynamics modulation by porous foam deaeration board

作　　者：王逸然 关朝阳 高翔 陈宏霞[1] WANG Yiran;GUAN Chaoyang;GAO Xiang;CHEN Hongxia(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《化工学报》2022年第11期4948-4956,共9页CIESC Journal

基　　金：北京市自然科学基金项目(3222046);国家自然科学基金项目(52176152)。

摘　　要：利用不同的改性方法对多孔泡沫铜表面进行浸润性改性处理,并制备了一系列具有不同疏水性的吸气板,系统研究了悬挂吸气板对沸腾单气泡生长、脱离阶段的影响。结果表明,不同吸气高度和吸气浸润性均对沸腾气泡动力学特性具有重要影响。当吸气高度小于气泡最大生长高度时,吸气板可实现强制气泡脱离并有效减小气泡最大脱离直径。当吸气板表面浸润角为150°时,吸气效果最佳,最短可将脱离阶段缩短至3 ms,最大瞬时吸气速率可达5.46 mm^(3)/ms,为浸润角是100°吸气板吸气速率的3.96倍。耦合控制吸气板的吸气高度、浸润性和换热表面的微结构可共同实现对气泡生长阶段的提前干预和对脱离阶段的强制促进,真正实现沸腾动力学的全程强化。Deaeration boards(DBs)with different hydrophobicity were prepared and suspended over the monocrystalline silicon surfaces.The effects of DB on the boiling bubble dynamics were systematically investigated through high-speed video.The size evolution of boiling bubbles during the growth and departure stages was monitored.The results show that both the height and wettability of DB have important effects on the dynamic characteristics of boiling bubbles.When the height is less than the maximum growth height,the DB forces the bubble departure and reduces the maximum bubble departure diameter.When the contact angle of DB is 150°,the deaeration effect is the best,and the departure stage can be shortened to 3 ms,and the instantaneous deaeration rate can reach 5.46 mm^(3)/ms,which is 3.96 times that on the surface with the wetting contact angle at 100°.The coupled control of the deaeration height,wettability and the microstructure of the heat exchange surface of the deaeration board can jointly realize the early intervention of the bubble growth stage and the forced promotion of the detachment stage,so as to truly realize the full enhancement of the boiling dynamics.

关 键 词：核态沸腾 吸气板 气泡动力学 全程强化 浸润性 

分 类 号：TK121[动力工程及工程热物理—工程热物理]