In this study, boiling experiments were conducted with 2-propanol/water mixtures in confined gap geometry under various levels of gravity. The temperature field created within the parallel plate gap resulted in evaporation over the portion of the vapor-liquid interface of the bubble near the heated surface, and condensation near the cold surface. Full boiling curves were obtained and two boiling regimes—nucleate boiling and pseudofilm boiling—and the transition condition, the critical heat flux (CHF), were identified. The observations indicated that the presence of the gap geometry pushed the nucleate boiling regime to a lower superheated temperature range, resulting in correspondingly lower heat flux. With further increases of wall superheat, the vapor generated by the boiling process was trapped in the gap to blanket the heated surface. This caused premature occurrence of CHF conditions and deterioration of heat transfer in the pseudo-film boiling regime. The influence of the confined space was particularly significant when greater Marangoni forces were present under reduced gravity conditions. The CHF value of (molar fraction)=0.025, which corresponded to weaker Marangoni forces, was found to be greater than that of with a gap.
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e-mail: clsun@mail.ntust.edu.tw
e-mail: vcarey@me.berkeley.edu
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Research Papers
Effects of Gap Geometry and Gravity on Boiling Around a Constrained Bubble in 2-Propanol/Water Mixtures
Chen-li Sun,
Chen-li Sun
Department of Mechanical Engineering,
e-mail: clsun@mail.ntust.edu.tw
National Taiwan University of Science and Technology
, 43 Sec. 4 Keelung Rd., Taipei, 106, Taiwan
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Van P. Carey
Van P. Carey
Department of Mechanical Engineering,
e-mail: vcarey@me.berkeley.edu
University of California
, Berkeley, Berkeley, CA 94720-1740
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Chen-li Sun
Department of Mechanical Engineering,
National Taiwan University of Science and Technology
, 43 Sec. 4 Keelung Rd., Taipei, 106, Taiwane-mail: clsun@mail.ntust.edu.tw
Van P. Carey
Department of Mechanical Engineering,
University of California
, Berkeley, Berkeley, CA 94720-1740e-mail: vcarey@me.berkeley.edu
J. Heat Transfer. Feb 2007, 129(2): 114-123 (10 pages)
Published Online: May 15, 2006
Article history
Received:
October 10, 2005
Revised:
May 15, 2006
Citation
Sun, C., and Carey, V. P. (May 15, 2006). "Effects of Gap Geometry and Gravity on Boiling Around a Constrained Bubble in 2-Propanol/Water Mixtures." ASME. J. Heat Transfer. February 2007; 129(2): 114–123. https://doi.org/10.1115/1.2402178
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