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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2016014072
pages 1157-1168

DEPENDENCE OF WATER TEMPERATURE GRADIENT ON CONDENSATION IN STRATIFIED TWO-PHASE FLOW

Darius Laurinavicius
Lithuanian Energy Institute, 3 Breslaujos g., Kaunas, LITHUANIA, LT-44403
Marijus Seporaitis
Lithuanian Energy Institute, 3 Breslaujos g., Kaunas, LITHUANIA, LT-44403
Stasys Gasiunas
Lithuanian Energy Institute, 3 Breslaujos str., LT-3035 Kaunas, Lithuania
Mindaugas Valincius
Lithuanian Energy Institute, 3 Breslaujos str., LT-3035 Kaunas, Lithuania

RÉSUMÉ

The dependence of water behavior on condensing steam was examined in stratified cocurrent two-phase flow in a relatively short and narrow horizontal rectangular channel. The main scope of investigation was the process of heat removal from the horizontal water surface to the bulk. A high resolution IR measurement technique was employed to measure the water temperature field. Experiments were conducted at different inflow velocities of steam (6, 8, 10, and 12 m/s) and water (0.014, 0.028, 0.042, and 0.056 m/s). The data analysis was performed by comparing calculated vertical thermal gradients of water, bulk heating power distribution, density of steam condensation mass flux, and a modified Jacob criterion. The results showed very strong dependence of condensation on the steam velocity. The optimal condensation regime was found at a steam-to-water velocity ratio of 300–400.


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