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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on the direct contact condensation of the steam-air mixture in subcooled water flow in a rectangular channel
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Experimental study on the direct contact condensation of the steam-air mixture in subcooled water flow in a rectangular channel

机译：矩形通道过冷水流中汽-气混合物直接接触冷凝的实验研究

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摘要

An experimental study was performed to investigate the direct contact condensation (DCC) of steam-air mixture in subcooled water flow in a rectangular channel. The main inlet parameters including steam mass flux, water mass flux and water temperature were tested at 150-550 kg/(m~2s), 6-14 × 10~3kg/ (m~2 s) and 30 ℃, respectively. The air mass fraction was in the range of 0%-2%. Four different flow patterns for pure steam in subcooled water flow were filmed by a high speed camera. The effect of air on these four flow patterns was investigated by introducing air into steam. The pressure and temperatures on the wall of channel were measured without destroying the flow field. The results indicated that with the present of air, the direct contact condensation was hindered, the interface area enlarged, the mixture layer thickened and plenty of small bubbles gathered in the channel. The air had greater influence on the phase interface area of unstable flow patterns than that of stable flow patterns. This phenomenon could not only be observed in the pictures of flow patterns, but also be reflected in the bottom wall pressure and temperature distributions. The average heat transfer coefficient for pure steam jet in subcooled water flow was in the range of 3.92-6.81 MW/(m~2 ℃). Since air mass fraction increased, the average heat transfer coefficient decreased.
机译：进行了一项实验研究，以研究蒸汽-空气混合物在矩形通道中过冷水流中的直接接触冷凝（DCC）。主要入口参数包括蒸汽质量通量，水质量通量和水温，分别在150-550 kg /（m〜2s），6-14×10〜3kg /（m〜2 s）和30℃下进行测试。空气质量分数在0％-2％的范围内。高速相机拍摄了过冷水流中纯蒸汽的四种不同流型。通过将空气引入蒸汽中，研究了空气对这四种流动模式的影响。在不破坏流场的情况下测量通道壁上的压力和温度。结果表明，在空气的存在下，直接接触的凝结受到阻碍，界面面积增大，混合物层变厚，通道中聚集了许多小气泡。空气对不稳定流型的相界面面积的影响大于稳定流型的相界面面积。这种现象不仅可以在流型图中观察到，而且可以反映在底壁压力和温度分布中。纯蒸汽射流在过冷水流中的平均传热系数为3.92-6.81 MW /（m〜2℃）。由于空气质量分数增加，平均传热系数降低。

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