Bubble behaviors in subcooled boiling of wetting surface under low gravity

Koichi Suzuki, Haruhiko Ohta, Hiroshi Kawamura, Toshiaki Sugimoto

Research output: Contribution to journalArticle

Abstract

Stainless steel plate with 30mm in length, 1 mm in width and 0.1 mm in thickness is employed for a heating surface in subcooled quasi-pool boiling of water under low gravity performed by a parabolic flight. Testing liquid subcooling is about 10K at atmospheric pressure. The wetting heating surfaces are coated with ceramics materials which have been developed by a certain glass company. DC power is applied directly into the test heating surface and the bubble behaviors are observed by a high-speed video camera. Contact angle of water droplet is about 77-96 degree for the stainless surface and 30 degree or less for the wetting surface. In the ground experiment, the size of detaching bubbles from the wetting surface is smaller than those of stainless surface and the detaching period is shorter at same heating power. The burnout heat fluxes of wetting surfaces are about 50 percent higher those of stainless surfaces. In the low gravity experiment, DC power is applied into the surface at 10 second before start of low gravity and increases slightly until burnout. A single large bubble grows on the stainless surface and finally, the surface is burned out in a short period. For wetting surface, several large coalescing bubbles appear and they move rapidly on the surface, then one of the large bubbles grows and the burnout occurs. The burnout heat fluxes are higher than those of stainless surface. The wetting ceramics surface is considered to accelerate the liquid supply and the bubble moving.

Original languageEnglish
Pages (from-to)62-63
Number of pages2
JournalMicrogravity Science and Technology
Volume19
Issue number3-4
DOIs
Publication statusPublished - Jan 1 2007

Fingerprint

Wetting
microgravity
Bubbles (in fluids)
boiling
Boiling liquids
Bubble
wetting
Gravity
Gravitation
bubbles
burnout
Heating
heating
Heat Flux
Heat flux
heat flux
direct current
Liquid
ceramics
parabolic flight

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Engineering(all)
  • Physics and Astronomy(all)
  • Applied Mathematics

Cite this

Bubble behaviors in subcooled boiling of wetting surface under low gravity. / Suzuki, Koichi; Ohta, Haruhiko; Kawamura, Hiroshi; Sugimoto, Toshiaki.

In: Microgravity Science and Technology, Vol. 19, No. 3-4, 01.01.2007, p. 62-63.

Research output: Contribution to journalArticle

Suzuki, Koichi ; Ohta, Haruhiko ; Kawamura, Hiroshi ; Sugimoto, Toshiaki. / Bubble behaviors in subcooled boiling of wetting surface under low gravity. In: Microgravity Science and Technology. 2007 ; Vol. 19, No. 3-4. pp. 62-63.
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