Effect of semi-confinement on impingement heat transfer
Abstract
The influence of semi-confinement, provided by a 348 mm diameter plate parallel to the impingement surface, on heat transfer was studied for several Reynolds numbers and jet-to-plate spacings in the range 2 to 16 nozzle diameters. With nozzles of diameter 10 and 20 mm, the limit of the confining plate extended radially to 17.4 and 8.7 jet hole diameters, respectively. The results show that semi-confinement can cause significant reductions in impingement heat transfer coefficient, with the largest effect occurring at small jet-to-plate spacings. Reducing the jet hole diameter by one-half and doubling the relative limit of confinement appear to have no significant effect on the magnitudes of the decrease in average heat transfer coefficient.
- Publication:
-
Heat Transfer 1982, Volume 3
- Pub Date:
- 1982
- Bibcode:
- 1982hetr....3..395O
- Keywords:
-
- Heat Transfer;
- Jet Impingement;
- Nozzle Flow;
- Performance Tests;
- Data Reduction;
- Nusselt Number;
- Reynolds Number;
- Test Facilities;
- Fluid Mechanics and Heat Transfer