Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 157, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.119909
Keywords
Direct contact condensation; Condensation regime; Interface shape; Transition criterion
Categories
Funding
- National Nature Science Foundation of China [51606145]
- National Key R&D Program of China [2018YFB0604303]
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Steam direct contact condensation in subcooled water is widely used in various industries. The steam-water interface shape is an essential parameter for direct contact condensation. An experimental study was carried out to investigate the flow patterns and interface shape of bubbling regime with a vertical upward steam jet. Steam mass flux and water temperature were 8.34-50.13 kg/(m(2).s) and 40-85 degrees C, respectively. Three flow patterns such as chugging, smooth grown bubble, and rough grown bubble were found based on the dynamic behavior of steam-water interface. The bubble collapse frequency and the maximum bubble radius at the bubble growth stage were calculated. The bubble collapse frequency increased rapidly when the smooth grown bubble regime was transformed into the rough grown regime. When the water temperature was between 40-80 degrees C, the maximum bubble radius initially increased, and then decreased with the increase of steam mass flux. A transition criterion from the smooth grown bubble regime to the rough grown bubble regime was given based on the theoretical analysis and experimental data. (C) 2020 Elsevier Ltd. All rights reserved.
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