Statistics – Applications
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..504..751q&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM - 2000. AIP Conference Proceedings, Volume 504, pp. 751-758 (2000).
Statistics
Applications
Liquid-Vapor Transitions, Testing In Microgravity Environments, Thermodynamics Of Nucleation
Scientific paper
Experimental studies and numerical simulations of the single bubble growth and departure mechanisms under low gravity have been conducted. An artificial cavity of 10 μm in diameter was made on the polished Silicon wafer. The back surface of the wafer was electrically heated in order to control the surface nucleation superheat. The experiments were performed during the parabola flights of the KC-135. The test liquid was degassed water in the pressure range 14.7-18.0 Psia. The data of bubble size and shape from nucleation to departure as well as bubble growth time were obtained for wall superheats between 2.5 and 6.5 °C under saturation and small subcooling conditions. Analytical/numerical models were developed to describe the heat transfer through the micro-macro layer underneath and around a bubble formed at a nucleation site. In the micro layer model the capillary and disjoining pressures were included. Evolution of the bubble-liquid interface along with induced liquid motion was modeled. The experimental data and the computational prediction showed a good agreement. From the comparison of the low gravity results and those at earth normal gravity it is found that at the same wall superheat and liquid subcooling the bubble departure diameter can be approximately related to the gravity level through the relation Dd~1/g. Liquid subcooling has an appreciable effect on the bubble growth period. A relatively small subcooling can significantly prolong the time a bubble stays on the heater surface. .
Dhir V. K.
Qiu D. M.
Singh Sumeetpal S.
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