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首页> 外文期刊>International Journal of Heat and Fluid Flow >Experimental study on the direct contact condensation of the steam jet in subcooled water flow in a rectangular channel: Flow patterns and flow field
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Experimental study on the direct contact condensation of the steam jet in subcooled water flow in a rectangular channel: Flow patterns and flow field

机译：矩形通道中过冷水流中蒸汽射流直接接触冷凝的实验研究：流场和流场

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摘要

Direct contact condensation (DCC) of steam jet in subcooled water flow in a channel was experimentally studied. The main inlet parameters, including steam mass flux, water mass flux and water temperature were tested in the ranges of 200-600 kg/(m(2) s), 7-18 x 10(3) kg/(m(3) s), 288-333 K, respectively. Two unstable flow patterns and two stable flow patterns were observed via visualization window by a high speed camera. The flow patterns were determined by steam mass flux, water mass flux and water temperature, and the relationship between flow patterns and flow field parameters was discussed. The results indicated that whether pressure or temperature distributions on the bottom wall of channel could represent different flow patterns. And the position of pressure peak on the bottom wall could almost represent the condensation length. The upper wall pressure distributions were mainly dependent on steam and water mass flux; and the upper wall temperature distributions were affected by the three main inlet parameters. Moreover, the bottom wall pressure and temperature distributions of different unstable flow patterns had similar characteristics while those of stable flow patterns were affected by shock and expansion waves. The underlying cause of transition between different flow patterns under different inlet parameters was reflected and discussed based on pressure distributions. (C) 2015 Elsevier Inc. All rights reserved.
机译：实验研究了通道中过冷水流中蒸汽喷射的直接接触冷凝（DCC）。在200-600 kg /（m（2）s），7-18 x 10（3）kg /（m（3））的范围内测试了主要的进口参数，包括蒸汽质量通量，水质量通量和水温。 s），分别为288-333K。通过高速摄像机通过可视化窗口观察到两个不稳定的流动模式和两个稳定的流动模式。由蒸汽质量通量，水质量通量和水温确定了流型，并讨论了流型与流场参数之间的关系。结果表明，通道底壁上的压力或温度分布可以代表不同的流型。底壁上压力峰值的位置几乎可以代表冷凝长度。上壁压力分布主要取决于蒸汽和水的质量通量。上壁温度分布受三个主要入口参数的影响。此外，不同不稳定流型的底壁压力和温度分布具有相似的特征，而稳定流型的底壁压力和温度分布受到冲击波和膨胀波的影响。基于压力分布，反映并讨论了在不同入口参数下不同流型之间过渡的根本原因。 （C）2015 Elsevier Inc.保留所有权利。

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