Experiments are conducted to determine the log-mean averaged Nusselt number and overall pressure-drop coefficient in a pin-fin trapezoidal duct that models the cooling passages in modern gas turbine blades. The effects of pin arrangement (in-line and staggered), flow Reynolds number (6,000 ≦ Re ≦ 40,000) and ratio of lateral-to-total flow rate (0 ≦ ε ≦ 1.0) are examined. The results of smooth trapezoidal ducts without pin arrays are also obtained for comparison. It is found that, for the single-outlet-flow duct, the log-mean averaged Nusselt number in the pin-fin trapezoidal duct with lateral outlet is insensitive to the pin arrangement, which is higher than that in straight-outlet-flow duct with the corresponding pin array. As for the trapezoidal ducts having both outlets, the log-mean averaged Nusselt number has a local minimum value at about ε = 0.3. After about ε ≧ 0.8, the log-mean averaged Nusselt number is nearly independent of the pin configuration. Moreover, the staggered pin array pays more pressure-drop penalty as compared with the in-line pin array in the straight-outlet-flow duct; however, in the lateral-outlet-flow duct, the in-line and staggered pin arrays yield almost the same overall pressure drop.
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e-mail: jjhwang@chu.edu.tw
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April 1999
Research Papers
Heat Transfer and Pressure Drop in Pin-Fin Trapezoidal Ducts
J.-J. Hwang,
J.-J. Hwang
Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300
e-mail: jjhwang@chu.edu.tw
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D.-Y. Lai,
D.-Y. Lai
Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300
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Y.-P. Tsia
Y.-P. Tsia
Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300
Search for other works by this author on:
J.-J. Hwang
Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300
e-mail: jjhwang@chu.edu.tw
D.-Y. Lai
Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300
Y.-P. Tsia
Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300
J. Turbomach. Apr 1999, 121(2): 264-271 (8 pages)
Published Online: April 1, 1999
Article history
Received:
February 1, 1998
Online:
January 29, 2008
Citation
Hwang, J., Lai, D., and Tsia, Y. (April 1, 1999). "Heat Transfer and Pressure Drop in Pin-Fin Trapezoidal Ducts." ASME. J. Turbomach. April 1999; 121(2): 264–271. https://doi.org/10.1115/1.2841310
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