Interfacial shear and waviness effects on laminar film flow heat transfer in vertical tubes
Book
·
OSTI ID:428065
- Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering
This study presents experimental data for local laminar-film heat transfer with interfacial waviness and shear stress effects, for two film-formation methods: condensation only and condensation on injected films. The results explain differences between correlations commonly used to predict heat transfer through liquid films. Wave evolution is significantly influenced by both the length of longitudinal development and by the film-formation method. This study of condensation inside a vertical tube demonstrates that for small amplitude wavy films, heat transfer enhancement by interfacial shear results primarily from thinning of the film, whereas for films with large disturbance waves, interfacially-induced turbulent enhancement becomes increasingly important. Contrary to the common assumption, when the film is fairly smooth, interfacial shear has little effect on film transition to turbulence.
- OSTI ID:
- 428065
- Report Number(s):
- CONF-960815--; ISBN 0-7918-1508-0
- Country of Publication:
- United States
- Language:
- English
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