Heat-Transfer Studies of Dropwise Condensation and Thin-Film Evaporation
Abstract
Experiments were conducted to investigate heat transfer rates from water-film evaporation and dropwise condensation. Dropwise condensation was induced by coating the external surface of the heat-exchanger tubes with a polytetrafluoro ethylene polymer, and film evaporation was obtained by allowing water to fall in a thin film around the surface of the tube. The effect of tube length and feed flow on the over-all heat-transfer coefficient was also investigated. The over-all heat-transfer coefficients obtained from the dropwise condensation experiments were considerably greater than those obtained from the film-type condensation experiments conducted to obtain comparison data. Over-all heat transfer coefficients as high as 4000 Btu/sq ft/F/hr were obtained from the dropwise condensa tion experiments as compared to values of about 700 Btu/sq ft/F/hr that were obtained from the film-type condensation. The results of thin film evaporation on the intended surface of the tube were inconclusive.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1963
- Accession Number
- AD0410566
Entities
People
- C. Saturnino
Organizations
- Naval Facilities Engineering Service Center