Augmentation of in-tube condensation of R-113
Abstract
A smooth tube, the smooth tube with twisted-tape inserts of two different pitches, three internally finned tubes, two tubes with repeated-rib roughness, and a spirally fluted tube were tested. The twisted-tape inserts increased overall average heat transfer coefficients approximately 30 percent above those of the smooth tube on a nominal area basis. The finned tube with the shortest and largest number of fins had the best performance, with heat transfer coefficients increased up to 120 percent. The repeated-rib tubes increased overall average heat transfer coefficients about 80 percent over the smooth tube values. Improvements in heat transfer coefficient for the spirally fluted tube were approximately 50 percent.
- Publication:
-
Iowa University Progress Report
- Pub Date:
- January 1980
- Bibcode:
- 1980iowa.rept.....L
- Keywords:
-
- Augmentation;
- Condensers (Liquefiers);
- Film Condensation;
- Heat Transfer;
- Tubes;
- Heat Flux;
- Refrigerants;
- Superheating;
- Fluid Mechanics and Heat Transfer