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Flow Visualazation Of Bubble Condensation In Forced Convective Subcooled Boiling Flow

Situ, Rong, Yang, William, Tu, Jiyuan, Yeoh, Guan H., Hibiki, Takashi, Ishii, Mamoru, Park, G. C., & Brown, Richard J. (2008) Flow Visualazation Of Bubble Condensation In Forced Convective Subcooled Boiling Flow. In Prenel, Jean Pierre, Bailly, Yannick, & Champoussin, Jean Claude (Eds.) ISFV13 - 13th International Symposium on Flow Visualization; FLUVISU12 - 12th French Congress on Visualization in Fluid Mechanics, 1-4 July 2008, Nice, France.

Abstract

Subcooled boiling bubble condensation experiments were conducted in a vertical-upward annular channel by using water as the testing fluid at atmosphere pressure. The test runs comprised of bulk liquid temperatures, velocities and wall heat fluxes ranging from 75.0 degrees Celsius to 98.0 degrees Celsius, 0.25 m/s to 1.0 m/s and 150 kW/m2 to 200 kW/m2 respectively. A particle/droplet image analysis system was employed to capture the flow channel at four locations downstream of heated section for a total of 13 test conditions. The bubble Sauter-mean diameter was obtained in the range of 0.1 mm to 0.9 mm. It is also found that bubble sizes increase with the increase of liquid temperature or the decrease of liquid velocity. The condensation Nusselt number was calculated to be in the range of 10-4 to 10-1, which is much smaller than the typical range of 100 to102. This might due to the existence of non-condensable gas in the bubble.

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ID Code: 14807
Item Type: Conference Paper
Additional URLs:
Keywords: Bubble Condensation, Subcooled boiling Flow, water, Particle/Droplet Image Analysis
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Turbulent Flows (091508)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Heat and Mass Transfer Operations (091505)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2008 (The authors)
Deposited On: 10 Sep 2008
Last Modified: 29 Feb 2012 23:48

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