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http://dx.doi.org/10.9726/kspse.2015.19.5.032

Heat Transfer in a Two Wall Divergent Rectangular Channel with V-Shaped Ribs on One Wall  

Lee, Myung-Sung (Dpt. of Mechanical & System Engineering, Gyeongsang National University)
Ahn, Soo-Whan (Dpt. of Mechanical & System Engineering)
Publication Information
Journal of Power System Engineering / v.19, no.5, 2015 , pp. 32-37 More about this Journal
Abstract
The present study is to investigates the convective heat transfer characteristics and pressure drop inside the rib-roughened cooling passage of gas turbine blades. The divergent rectangular channel is fabricated with V-shaped ribs on one wall only and the inlet hydraulic diameter to outlet hydraulic diameter ratio($D_{ho}/D_{hi}$) of 1.49 is used. The current investigation has covered a Reynolds number (Re) range of 22,000~75,000, relative roughness height ($e/D_h$) of 0.1~0.2, and rib angle of attack (a) of $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$ for a fixed relative pitch of 10. Results show that the Nusselt numbers are the greatest in the $60^{\circ}$-angled ribs; however, the total friction factors are the highest in the $30^{\circ}$-angled ribs.
Keywords
Rib angle of attack; Heat transfer; Divergent channel; Total friction factor; V- Shaped rib;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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