A numerical model for a bubble in nucleate pool boiling
Thesis/Dissertation
·
OSTI ID:7273035
Growth of a hemispherical bubble in nucleate pool boiling is analyzed in two stages, using a numerical technique. In the first stage, growth in a viscous medium on an isothermally heated surface is studied, neglecting the microlayer contribution. Results are compared with an analytical solution of homogeneous growth in a superheated medium, to other numerical results for heterogeneous growth in an inviscid medium, and to previous experimental work. The flow field and temperature distribution around the bubble exhibit similarity for large times when an appropriate non-dimensionalization is used. In the second stage, growth is investigated including the analyses of a microlayer, the non-condensible gas inside the bubble, and the temperature distribution in the heated surface. The temperature distribution in the fluid and in the solid, and the microlayer profile is found to be self-similar for large time. The microlayer profile is almost triangular except at the tail point, where it is very steep. The famous bulk convection theory is found to be questionable.
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames, IA (United States)
- OSTI ID:
- 7273035
- Country of Publication:
- United States
- Language:
- English
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