文章摘要
刘翔.点接触微纳受限空间内油包水液滴相变特性的红外观测[J].润滑与密封,2018,43(3):42-48
点接触微纳受限空间内油包水液滴相变特性的红外观测
Infrared Observation of Water/Oil Droplet Phase Transition Characteristics in Micro nano Confined Space of Point Contact Region
  
DOI:10.3969/j.issn.0254-0150.2018.03.007
中文关键词: 油水两相  红外热像  相变  微纳空间
英文关键词: oil water two phase  infrared thermography  phase transition  micro nano space
基金项目:国家自然科学基金项目(51605460;51475440);中国博士后科学基金项目(2016M591228).
作者单位E-mail
刘翔 中国计量科学研究院力声所容量密度实验室 liuxiang@nim.ac.cn 
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中文摘要:
      为模拟金属轧制以及润滑等实际工况中微纳受限空间内部的能量和质量传递情况,搭建包含受限油包水液滴的球盘点接触实验台来研究传统的微管道沸腾问题;研究过热点接触受限空间内水滴形成的毛细液桥以及油包水受限液滴的蒸发和扩散特性,分析接触线的质量迁移特性对受限毛细液桥内的成核及气泡行为的影响。实验观测发现,对于受限空间内液体相变过程来说,过热度是气泡产生的必要条件,而足够的蒸气补充是气泡长大的必要条件;润滑油膜对过热空间内水分子的蒸发和扩散有着显著的抑制作用;油包水液滴即使在200 ℃高温受限空间内也能够长时间存在,这势必会对受到水污染的机械系统造成持续的破坏。
英文摘要:
      To simulate the heat and mass transfer in micro nano heterogeneous systems,such as metal production processes and lubrication,the point contact condition with the formation of narrowly confined water/oil meniscus was constructed to study the classical micro channel boiling problem.The evaporation and diffusion of the superheated water meniscus and water/oil droplet in the point contact geometry were investigated,and the influence of the contact line transport behaviors on the nucleation and bubble behaviors in the confined meniscus was analyzed.The observations suggest that superheat is the necessary condition for bubble formation and enough vapor supply is the necessary condition for bubble growth in the confined liquid.The oil film can significantly inhibit the evaporation and diffusion of water molecules in the superheat geometry.The water/oil droplet can exist for a long time even in the hot confined space of 200 ℃,which has sustained damages to the mechanical system suffering from water contamination.
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