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Some parameter boundaries governing microgravity pool boiling modes.

Herman Merte1

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125, USA. merte@umich.edu

Annals of the New York Academy of Sciences
|November 25, 2006
PubMed
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Microgravity pool boiling experiments reveal distinct boiling modes, including dryout, influenced by heat flux and liquid subcooling. Marangoni convection effects were analyzed for large vapor bubbles near the heater surface.

Area of Science:

  • Heat Transfer
  • Fluid Dynamics
  • Microgravity Science

Background:

  • Pool boiling is critical for thermal management in various applications.
  • Understanding boiling behavior in microgravity is essential for space exploration and technology.
  • Previous studies have indicated unique phenomena in microgravity boiling.

Purpose of the Study:

  • To investigate pool boiling phenomena in microgravity using R-113.
  • To categorize and analyze different boiling modes under varying heat flux and subcooling conditions.
  • To compute forces influencing vapor bubble behavior and counteracting Marangoni convection.

Main Methods:

  • Conducted pool boiling experiments on five Space Shuttle flights.
  • Utilized a flat plate heater with a gold film on a quartz substrate acting as a resistance thermometer.

Related Experiment Videos

  • Photographed vapor bubble behavior from multiple angles and analyzed 16-mm movie films.
  • Performed computational analysis of forces related to momentum transfer and Marangoni convection.

    • Main Results:

    • Observed and categorized five distinct pool boiling modes: incipient, nucleate with Marangoni effects, coalescence, partial dryout, and complete dryout.
    • Delineated the boundaries between these modes graphically based on heat flux and liquid subcooling.
    • Quantified forces counteracting Marangoni convection for steady nucleate boiling.

    Conclusions:

    • Heat flux and liquid subcooling are key parameters defining boiling modes in microgravity.
    • Marangoni convection significantly influences vapor bubble behavior near the heater surface.
    • The study provides a comprehensive understanding of microgravity pool boiling, crucial for spacecraft thermal control.