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首页> 外文会议>HTD-vol.376-2; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >A VISUALIZATION STUDY OF HETEROGENEOUS CONDENSATION ON NANO-PARTICLES IN FULLY SATURATED MICROCHANNEL
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A VISUALIZATION STUDY OF HETEROGENEOUS CONDENSATION ON NANO-PARTICLES IN FULLY SATURATED MICROCHANNEL

机译：完全饱和微通道中纳米颗粒非均相凝结的可视化研究

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摘要

The high heat transfer rate and compactness of micro/minichannel mutiphase flow system associated with phase change phenomena have been increasingly attractive in thermal management and microfluidic sensor development for applications which demand requirements such as small, light, and efficient systems. In this paper, quarts square microchannels with a hydraulic diameter of 1000 μm and a length of 20 mm are used for the path of fully saturated forced convection air flow with nano-particles ( ? ～ 100 nm). The outside of microchannel wall is cooled by natural convection of room air. Two distinctive heterogeneous condensation modes are observed as of droplet condensation on the channel wall and nano-particle nucleate condensation in the core air stream. At the exit of microchannel, liquid droplets with an order of micrometer diameter are observed by microscopic visualization using Nd:YAG (532 nm) Laser sheet illumination. The droplet growth visualization data show a influence of gas mixture mass flux, local vapor concentration, and wall surface condition either on wall droplet condensation and nucleate condensation droplet.
机译：与相变现象相关的微/微通道多相流系统的高传热率和紧凑性在热管理和微流体传感器开发中对于要求小型，轻便和高效系统的应用越来越有吸引力。本文将水力直径为1000μm，长度为20 mm的夸脱方形微通道用于纳米颗粒（forced？〜100 nm）完全饱和的强制对流气流的路径。微通道壁的外部通过室内空气的自然对流进行冷却。观察到两种独特的异质冷凝模式，如通道壁上的液滴冷凝和核心气流中的纳米粒子核冷凝。在微通道的出口处，使用Nd：YAG（532 nm）激光片照射，通过显微镜观察可观察到直径为微米级的液滴。液滴生长可视化数据显示了气体混合物质量通量，局部蒸汽浓度和壁表面状况对壁液滴冷凝和成核冷凝液滴的影响。

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