Condensation Heat Transfer Inside Rotating Heat Pipes.
Abstract
An analytical study was undertaken to determine two-dimensional wall conduction effects during film condensation on an internally finned, rotating heat pipe. An earlier Finite Element method was modified to solve the problem by using different numbers of axial increments and different numbers of elements. Resulting heat transfer rates were shown to be similar to those obtained earlier. A rotating heat pipe was tested using various copper condensers including two smooth-wall cylinders and a 0.5 degree truncated cone. All condensers were tested at different rotational speeds using distilled water as the working fluid. In the case of the 1.46 inch diameter cylindrical condenser, data were also taken with Freon 113 and ethanol. The heat transfer rate of each condenser was plotted against the saturation temperature of the vapor. Using the experimental results obtained in this thesis, together with the data of earlier theses, a comparison was made with the theoretical analysis of Roetzel. Agreement is reasonable, and Roetzel's analysis can be used to predict overall rotating heat pipe performance to within + or - 20 percent for water. The data for Freon 113 and ethanol, however, fall approximately 35 percent higher than this theory. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1977
- Accession Number
- ADA042118
Entities
People
- Chaiyuth Tantrakul
Organizations
- Naval Postgraduate School