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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
Summary
This summary is machine-generated.

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.

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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.
  • 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.