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Determination of annular condensation heat transfer coefficient of steam in microchannels with trapezoidal cross sections

机译:梯形横截面微通道中蒸汽的环形冷凝水传热系数的确定

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摘要

Experiments have been carried out to determine annular condensation heat transfer coefficient of steam in two silicon microchannels having trapezoidal cross sections with the same aspect ratio of 3.15 at 54 < G < 559 kg/m~2 s under 3-side cooling conditions. A semi-analytical method, based on turbulent flow boundary layer theory of liquid film with correlations of pressure drop and void fraction valid for micro-channels, is used to derive the annular local condensation heat transfer coefficients. The predicted values based on the semi-analytical model are found within ±20% of 423 data points. It is shown that the annular condensation heat transfer coefficient in a microchannel increases with mass flux and quality and decreases with the hydraulic diameter.
机译:已经进行了实验,以测定在3侧冷却条件下,在54

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