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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Ammari, H. D. Hay, N. Lampard, D. |
| Copyright Year | 1989 |
| Abstract | The effect of density ratio of cooling films on the heat transfer coefficient on a flat plate is investigated using a heat-mass transfer analogy. The experimental technique employed uses a swollen polymer surface and laser holographic interferometry. A density ratio of 1.0 was achieved using air as the injectant. Density ratios of 1.38 and 1.52, representative of turbine operating conditions, were obtained by using foreign gases. The coolant fluids were injected at various blowing rates through a single normal hole or through a row of holes spaced at three-diameter intervals, and inclined at 35° or 90° to the mainstream direction. The experiments were conducted under isothermal conditions in a subsonic, zero mainstream pressure gradient turbulent boundary layer. The results indicated large differences in behaviour between the two injection angles. For normal injection, the heat transfer coefficient at a fixed blowing parameter was insensitive to the variation of density ratio, whereas for 35° injection strong dependence was observed. Scaling parameters for the heat transfer data have been proposed so that use can be made of data obtained at density ratios not representative of gas turbine practice. In addition, a correlation for normal injection data has been formulated. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791879160 |
| DOI | 10.1115/89-GT-176 |
| Volume Number | Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration |
| Conference Proceedings | ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition |
| Language | English |
| Publisher Date | 1989-06-04 |
| Publisher Place | Toronto, Ontario, Canada |
| Access Restriction | Open |
| Subject Keyword | Cooling Flat plates Pressure gradient Density Gases Fluids Heat Gas turbines Lasers Coolants Holographic interferometry Polymers Heat transfer coefficients Heat transfer Turbines Boundary layer turbulence |
| Content Type | Text |
| Resource Type | Article |
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