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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Carbon dioxide flow boiling in a single microchannel - Part II: Heat transfer
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Carbon dioxide flow boiling in a single microchannel - Part II: Heat transfer

机译：单个微通道中沸腾的二氧化碳流-第二部分：传热

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摘要

Flow boiling heat transfer coefficients of CO_2 have been measured in a single microchannel. Experiments were carried out in a horizontal stainless steel tube of 0.529mm inner diameter, for three temperatures (-10, -5 and 0°C), with the mass flux ranging from 200 to 1200kg/m~2s and the heat flux varying from 10 to 30kW/m2. The investigation covered qualities from zero to the dryout inception, i.e. pre-dryout conditions. Compared to larger microchannels and positive temperatures, a higher contribution of convective boiling was found, with a larger heat transfer coefficient than for pure nucleate boiling. Mainly two heat transfer regimes were found, depending on the boiling number (Bo). For Bo>1.1×10~(-4), the heat transfer coefficient was highly dependent on the heat flux and moderately influenced by the quality and the mass flux. For Bo<1.1×10~(-4), the heat transfer coefficient was hardly affected by the heat flux but strongly influenced by the quality and the mass flux. In addition, dryout results were reported. The effect of the mass flux on the dryout inception quality was found to be highly dependent on the heat flux and the saturation temperature.
机译：已经在单个微通道中测量了CO_2的沸腾传热系数。实验是在内径为0.529mm的水平不锈钢管中，在三种温度（-10，-5和0°C）下进行的，质量通量为200至1200kg / m〜2s，热通量为10至30kW / m2。该调查涵盖了从零到开始变干的质量，即变干前的条件。与较大的微通道和正温度相比，对流沸腾的贡献更大，其传热系数比纯核沸腾更大。根据沸腾数（Bo），主要发现了两种传热方式。当Bo> 1.1×10〜（-4）时，传热系数高度依赖于热通量，并且受质量和质量通量的影响较小。对于Bo <1.1×10〜（-4），传热系数几乎不受热通量的影响，而受质量和质量通量的影响很大。另外，还报告了变干结果。发现质量通量对变干开始质量的影响高度依赖于热通量和饱和温度。

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