This work studies experimentally the rapid boiling of a droplet rising in a host liquid environment, within a range of superheats not previously investigated. The direct-contact rapid-boiling process has many advantages in the fields of heat exchange and multiphase flow. By taking into account the superheat, heat transfer, and hydrodynamics of the multiphase-droplet the aim of this study is to create greater insight into the character of this transient-boiling process, for the first time. The sudden depressurization of a water column led to the rapid boiling of liquid propane droplets rising by buoyancy. During this millisecond boiling distinct stages were identified. Appropriate critical times for the transition between stages were defined by a simplified model, among these a novel criterion for the sudden pause in boiling caused by the engulfing liquid-film's collapse. Good agreement was found between these predicted time-points and measured changes in the boiling profile. This form of boiling, though being very rapid and sustaining high heat transfer rates, is still calm in nature, therefore, more predictable and widely applicable. Understanding this form of boiling suggests that the “design” of the boiling curve may be possible by setting the initial parameters.
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e-mail: herman@tx.technion.ac.il
e-mail: gany@tx.technion.ac.il
e-mail: merezra@tx.technion.ac.il
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December 2009
This article was originally published in
Journal of Heat Transfer
Research Papers
Rapid Boiling of a Two-Phase Droplet in an Immiscible Liquid at High Superheat
Herman D. Haustein,
Herman D. Haustein
Mem. ASME
Faculty of Mechanical Engineering,
e-mail: herman@tx.technion.ac.il
Technion Israel Institute of Technology
, Haifa 32000, Israel
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Alon Gany,
Alon Gany
Professor Lena and Ben Fohrman Chair
Mem. ASME
Faculty of Aerospace Engineering,
e-mail: gany@tx.technion.ac.il
Technion Israel Institute of Technology
, Haifa 32000, Israel
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Ezra Elias
Ezra Elias
Professor T. Segal Chair
Faculty of Mechanical Engineering,
e-mail: merezra@tx.technion.ac.il
Technion Israel Institute of Technology
, Haifa 32000, Israel
Search for other works by this author on:
Herman D. Haustein
Mem. ASME
Faculty of Mechanical Engineering,
Technion Israel Institute of Technology
, Haifa 32000, Israele-mail: herman@tx.technion.ac.il
Alon Gany
Professor Lena and Ben Fohrman Chair
Mem. ASME
Faculty of Aerospace Engineering,
Technion Israel Institute of Technology
, Haifa 32000, Israele-mail: gany@tx.technion.ac.il
Ezra Elias
Professor T. Segal Chair
Faculty of Mechanical Engineering,
Technion Israel Institute of Technology
, Haifa 32000, Israele-mail: merezra@tx.technion.ac.il
J. Heat Transfer. Dec 2009, 131(12): 121010 (7 pages)
Published Online: October 15, 2009
Article history
Received:
September 11, 2008
Revised:
February 25, 2009
Published:
October 15, 2009
Citation
Haustein, H. D., Gany, A., and Elias, E. (October 15, 2009). "Rapid Boiling of a Two-Phase Droplet in an Immiscible Liquid at High Superheat." ASME. J. Heat Transfer. December 2009; 131(12): 121010. https://doi.org/10.1115/1.3220146
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