Effect of inclination, transverse intertip spacing, and logitudinal pitch on crossflow heat transfer from an array of finned tubes
Abstract
Experiments were performed to investigate the heat transfer characteristics of a circumferentially finned, crossflow heat exchanger. Three aspects of the heat transfer were examined. The first was the effect of inclining a single tube at an angle of attack to the crossflow. The secoind dealt with the transverse intertip spacing S sub T in a single-row heat exchanger, while the third focused on the longitudinal intertip spacing S sub L and array pattern (in-line or staggered) in a double-row heat exchanger. For the entire investigations, the freestream Reynolds number ranged from 7,500 to 32,000. The Nusselt number for the single tube displayed a moderate increase with increasing inclination angle, about 20 percent for a 40 degree inclination. The single-row Nusselt number and pressure drop increased rapidly with decreasing S sub T at a fixed freestream Reynolds number but was less sensitive to S sub T at fixed minimum-area Reynolds number.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1984
- Bibcode:
- 1984PhDT........55S
- Keywords:
-
- Angle Of Attack;
- Cross Flow;
- Heat Exchangers;
- Heat Transfer;
- Efficiency;
- Pressure Reduction;
- Reynolds Number;
- Spacing;
- Fluid Mechanics and Heat Transfer