EXPERIMENTAL INVESTIGATION OF TRANSPIRATION COOLING IN TURBULENT PIPE FLOW
S>The effect of coolant air injection at the wall on the velocity and temperature distributions of the turbulent flow in a porous-wall pipe was experimentally investigated. The experimental apparatus was designed to establish a fully developed turbulent pipe flow at the entrance to a five-inch- diameter porous-wall pipe test section. Main-stream Reynolds number was varied up to 300,000 for the isothermal case and corresponding weight flow for the non- isothermal case. The coolant flow to main-stream rates of 0.0005 to 0.018 was covered. The temperature range was between the ambient temperature and 900 deg F. The agreement between the theoretical results and the experimental data is found to be satisfactory. The results show that the wallfriction coefficient increases with the increase of coolant injection whereas the heat transfer coefficient decreases with the increase of coolant injection. Thus, the analogue between the heat transfer and momentum transfer does not exist in transpiration cooling of pipe flow. (auth)
- Research Organization:
- Brooklyn. Polytechnic Inst.
- NSA Number:
- NSA-13-004985
- OSTI ID:
- 4257751
- Report Number(s):
- PIBAL-479
- Country of Publication:
- United States
- Language:
- English
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