An experimental investigation of heat transfer characteristics for turbulent flow over staggered ribs in a square duct

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Experimental Thermal and Fluid Science; (United States)

DOI:https://doi.org/10.1016/0894-1777(91)90078-6· OSTI ID:5763106

Hong, Ying-Jong; Hsieh, Shou-shing ^[1]

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1. National Sun Yat-Sen University, Kaohsiung (Republic of China)

An experimental study of developing and fully developed turbulent air flow in a square duct with two opposite rib-roughened walls in which the ribs are attached in a staggered fashion was conducted to determine the heat-transfer characteristics. The rib height-to-hydraulic diameter ratio was 0.19, the rib pitch-to-height ratio was 5.31. The streamwise temperature distribution was measured, and a law of the wall for the thermal boundary layer at each free-stream turbulence level was obtained. The effects of free-stream turbulence intensity with variations of 4-11 percent on heat transfer coefficients were also examined. Finally, the relationship between Nusselt number and Reynolds number was correlated. The results can be used in the design of turbine blade cooling channels. 27 refs.

• OSTI ID: 5763106
• Journal Information: Experimental Thermal and Fluid Science; (United States), Journal Name: Experimental Thermal and Fluid Science; (United States) Vol. 4; ISSN ETFSE; ISSN 0894-1777
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
AIR FLOW
BOUNDARY LAYERS
CONVECTION
COOLING
ENERGY TRANSFER
FLUID FLOW
FORCED CONVECTION
GAS FLOW
HEAT TRANSFER
LAYERS
MASS TRANSFER
NUSSELT NUMBER
REYNOLDS NUMBER
TEMPERATURE DISTRIBUTION
TURBINE BLADES
TURBULENT FLOW