Studies of full-coverage film cooling. II - Measurement of local heat transfer coefficient
Abstract
The local heat transfer coefficient of full-coverage film-cooled wall has been measured by using the law of analogy to mass transfer. For this experiment, the technique of sublimation of naphthalene was used. From these experiments, the effects of the mass flux ratio and nondimensional injection wall temperature ratio on the local Stanton number are made clear and it is confirmed experimentally that the local Stanton number is a linear function of nondimensional temperature ratio as expected from the analysis. Furthermore, the local heat transfer coefficient on the backside surface has been obtained and a technique for the improvement of cooling effectiveness is discussed.
- Publication:
-
American Society of Mechanical Engineers
- Pub Date:
- March 1981
- Bibcode:
- 1981gatu.confR....K
- Keywords:
-
- Film Cooling;
- Heat Transfer Coefficients;
- Perforated Plates;
- Porous Walls;
- Stanton Number;
- Flow Visualization;
- Fluid Injection;
- Naphthalene;
- Sublimation;
- Fluid Mechanics and Heat Transfer