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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on the effect of non-condensable gas dissolved in sub-cooled water on steam jet condensation in a rectangular channel
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Experimental study on the effect of non-condensable gas dissolved in sub-cooled water on steam jet condensation in a rectangular channel

机译：过冷水中溶解的非冷凝性气体对矩形通道内蒸汽喷射冷凝影响的实验研究

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摘要

An experimental study was performed to investigate the effect of non-condensable gas dissolved in sub cooled water on steam-water direct contact condensation (DCC). Non-condensable gas dissolved in the sub-cooled water was removed mostly by a degassing membrane device, and the mass fraction of dissolved oxygen was reduced from 7.6 mg/L to 4.6 mg/L and 1.1 mg/L respectively by degassing. Before and after degassing, the flow patterns, thickness of the mixture layer, temperature and pressure distributions, as well as average volumetric heat transfer coefficient were discussed respectively. The visualization results proved that the mixture layer between the water region and steam region mainly consisted of steam, hot water and a small amount of non-condensable gas dissolved out from water at saturated state. Furthermore, the formation mechanism of the mixture layer was qualitatively discussed. Besides, the temperature and pressure distributions on upper and bottom wall were hardly affected by the non-condensable gas dissolved in sub-cooled water. Moreover, the average volumetric heat transfer coefficient was investigated before and after degassing, and it was concluded that the dissolved non-condensable gas had a slight effect on the heat and mass transfer characteristic of DCC process. (C) 2019 Elsevier Ltd. All rights reserved.
机译：进行了一项实验研究，以研究溶解在过冷水中的不可冷凝气体对汽水直接接触冷凝（DCC）的影响。溶解在过冷水中的不可冷凝气体大部分通过脱气膜装置除去，并且溶解的氧气的质量分数通过脱气分别从7.6 mg / L降低到4.6 mg / L和1.1 mg / L。脱气前后，分别讨论了流态，混合层厚度，温度和压力分布以及平均体积传热系数。可视化结果表明，水区与蒸汽区之间的混合层主要由蒸汽，热水和少量从饱和状态下的水中溶解出来的不可凝气体组成。此外，定性地讨论了混合物层的形成机理。另外，溶解在过冷水中的不凝性气体几乎不会影响上壁和底壁上的温度和压力分布。此外，研究了脱气前后的平均体积传热系数，得出的结论是，溶解的不可冷凝气体对DCC工艺的传热和传质特性影响很小。 （C）2019 Elsevier Ltd.保留所有权利。

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