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首页> 外文会议>ASME international conference on nanochannels, microchannels and minichannels >PHYSICS OF TRANSITION TO ANNULAR FLOW IN MICROCHANNEL FLOW BOILING PROCESS
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PHYSICS OF TRANSITION TO ANNULAR FLOW IN MICROCHANNEL FLOW BOILING PROCESS

机译：微通道流沸腾过程中过渡到环形流的物理学

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摘要

Transition to annular flow regime in microchannels is arguably one of the most complex phenomena in the flow boiling process. The instability of the vapor-liquid interface in this interstitial regime presents an intricate situation in which the interface pattern rapidly changes with the mass flow rate and surface heat flux. Although a few past studies have reported observing this regime, thermohydraulics of the process and flow and boundary conditions under which this transition occurs have remained largely unknown. The main obstacle in deciphering the physics of this process is lack of measurement tools to characterize hydrodynamics and thermal characteristics of this flow regime at microscales. The present study benefits from implementation of a novel test device that enables measuring the liquid film thickness and its rapid variations with micrometer and microseconds spatial and temporal resolutions. It is determined that each flow regime has a unique surface temperature signature that enables its clear distinction without need for high-speed visualization. Based on the dynamics of the flow, we identified that the transitional region is comprised of two regimes coalescing bubbles (CB) and semi-annular flow conditions. The difference between these two flow regimes emanates from motion of liquid film beneath the bubble.
机译：在微通道中过渡到环形流动状态无疑是流动沸腾过程中最复杂的现象之一。气液界面在这种间隙状态下的不稳定性呈现出复杂的情况，其中界面图案随质量流量和表面热通量而快速变化。尽管过去的一些研究已经报道了观察这种状态的过程，但是在很大程度上仍未发现发生这种转变的过程，流动和边界条件的热工水力。破译这一过程的物理原理的主要障碍是缺乏测量工具来表征这种流动状态的微观动力学和热力学特性。本研究得益于新型测试设备的实施，该测试设备能够以微米和微秒的时空分辨率测量液膜厚度及其快速变化。确定每个流态都有一个独特的表面温度特征，从而无需高速可视化就可以清楚地区分。基于流动的动力学，我们确定过渡区域由聚结气泡（CB）和半环流条件两个区域组成。这两种流动方式之间的差异源于气泡下面的液膜运动。

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