Flow visualazation of bubble condensation in forced convective subcooled boiling flow

Situ, R., Yang, W., Tu, J.Y., Yeoh, G.H., Hibiki, T., Ishii, M., Park, G. C., and Brown, R.J. (2008) Flow visualazation of bubble condensation in forced convective subcooled boiling flow. In: Proceedings of 13th International Symposium on Flow Visualization / 12th French Congress on Visualization in Fluid Mechanics, - . From: 13th International Symposium on Flow Visualization / 12th French Congress on Visualization in Fluid Mechanics, 1-4 July, 2008, Nice, France.

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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°C to 98.0°C, 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 to 102. This might due to the existence of non-condensable gas in the bubble.

Item ID: 21527
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: bubble condensation, subcooled boiling flow, fluid, water, visualization method(s), particle/droplet image analysis
Date Deposited: 20 Aug 2012 04:28
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 50%
09 ENGINEERING > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations @ 50%
SEO Codes: 85 ENERGY > 8507 Energy Conservation and Efficiency > 850701 Commercial Energy Conservation and Efficiency @ 50%
85 ENERGY > 8504 Energy Transformation > 850403 Nuclear Energy @ 50%
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