微通道气液界面波不稳定性及其对沸腾换热影响机理

项目名称： 微通道气液界面波不稳定性及其对沸腾换热影响机理

项目编号： No.51206110

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 工程热物理与能源利用学科

项目作者： 耑锐

作者单位： 上海交通大学

项目金额： 25万元

中文摘要： 微通道强化传热可满足紧凑型高冷却能力换热器的需求，其研究受到广泛关注，气液界面波的不稳定性对热质传输的影响是其中关键问题之一。在微通道气液两相流中，气液界面的波动失稳直接影响到流型转变和传热传质过程，而界面力的作用以及扰动的影响，使得气液界面波动的物理机理甚为复杂。项目采用Galerkin-有限元方法计算复杂边界条件下界面波动与失稳后的演变，结合理论分析和实验，掌握界面波结构和波动参数变化规律，得到流型转变的参数判别依据，分析界面波不稳定性与液膜传热的相互影响机制。其次，针对微通道近临界热流密度下气液界面形态以及临界沸腾形成机制，建立沸腾临界热流的理论分析方法，揭示近临界热流密度下气液界面波结构和失稳过程以及传热过程，通过理论分析结合实验研究揭示界面波不稳定性与液膜润湿对CHF的影响机理。研究结果对微尺度气液两相流动换热的不稳定性问题有理论意义，为微通道强化换热工程设计提供理论基础。

中文关键词： 微通道；界面波；临界热流；气液两相流；传热传质

英文摘要： Researchers have paid more attention to micro-channel enhanced heat transfer, which can dissipate high heat fluxes and be used for compact heat exchangers. Effects of instability of vapor-liquid interfacial waves on heat and mass transport are crucial problems in micro-channel two-phase flow. Due to the complication of force action along interface and disturbance, the mechanism of interfacial fluctuation is intricate. The primary goal of the present study is to develop a theoretical method for interfacial wave behavior under actions of complex boundary conditions. Through the Galerkin-finite element method, analysis and experiments, we want to cognize interfacial wave structure and parameter variance, give critical parameters for flow pattern transitions, and analyze interactions between interfacial waves and heat transport. Second, it is unclear about interface instability during CHF and mechanism of CHF transition. We aim at developing theoretical analysis about boiling CHF. Therefore, we can illustrate interfacial wave regime and instability as well as heat transport during critical heat flux transition. Through theoretical analysis and experiments, we can discover actions of interfacial instability and wettability of channel wall on CHF. The contribution of this study to the instability of micro-channel two-

英文关键词： microchannel；interfacial wave；critical heat flux；vapor-liquid two phase flow；heat and mass transfer