Heat transfer and friction characteristics in rectangular channels with rib turbulators
- Texas A and M Univ., College Station (USA)
The effect of the channel aspect ratio on the distribution of the local heat transfer coefficient in rectangular channels with two opposite ribbed walls (to simulate turbine airfoil cooling passages) was determined for a Reynolds number range of 10,000 to 60,000. The channel width-to-height ratios (W/H, ribs on side W) were 1/4, 1/2, 1, 2, and 4. The test channels were heated by passing current through thin, stainless steel foils instrumented with thermocouples. The local heat transfer coefficients on the ribbed side wall and on the smooth side wall of each test channel from the channel entrance to the fully developed regions were measured for two rib spacings (P/e = 10 and 20). The rib angle-of-attack was kept at 90 deg. The local data in the fully developed region were averaged and correlated, based on the heat transfer and friction similarity laws developed for ribbed channels, to cover the ranges of channel aspect ratio, rib spacing, rib height, and Reynolds number. The results compare well with the published data for flow in a square channel with two opposite ribbed walls. The correlations can be used in the design of turbine airfoil cooling passages.
- OSTI ID:
- 5465471
- Journal Information:
- Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 110:2; ISSN 0022-1481; ISSN JHTRA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420400* -- Engineering-- Heat Transfer & Fluid Flow
ENERGY TRANSFER
FINS
FLUID FLOW
FRICTION
GAS TURBINES
HEAT TRANSFER
MACHINERY
MEASURING INSTRUMENTS
MEASURING METHODS
REYNOLDS NUMBER
TEMPERATURE DISTRIBUTION
THERMOCOUPLES
TURBINE BLADES
TURBINES
TURBOMACHINERY
TURBULENT FLOW
VANES