The effect of slit ribs on heat transfer and friction in a rectangular channel is investigated experimentally. The slit ribs are arranged in-line on two opposite walls of the channel. Three rib open-area ratios (β = 24, 37, and 46 percent), three rib pitch-to-height ratios (Pi/H = 10, 20, and 30), and two rib height-to-channel hydraulic diameter ratios (H/De = 0.081, and 0.162) are examined. The Reynolds number ranges from 10,000 to 50,000. Laser holographic interferometry is employed to measure the local heat transfer coefficients of the ribbed wall quantitatively, and observe the flow over the ribbed wall qualitatively. The results show that the slit rib has an advantage of avoiding “hot spots.” In addition, the heat transfer performance of the slit-ribbed channel is much better than that of the solid-ribbed channel. Semi-empirical correlations for friction and heat transfer are developed to account for rib spacings and open-area ratios. These correlations may be used in the design of turbine blade cooling passages.
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July 1997
Research Papers
Heat Transfer Augmentation in a Rectangular Channel With Slit Rib-Turbulators on Two Opposite Walls
Jenn-Jiang Hwang,
Jenn-Jiang Hwang
Department of Mechanical Engineering, Chung-Hua Polytechnic Institute, Hsinchu, Taiwan 30067
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Tong-Miin Liou
Tong-Miin Liou
Department of Power Mechanical Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30043
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Jenn-Jiang Hwang
Department of Mechanical Engineering, Chung-Hua Polytechnic Institute, Hsinchu, Taiwan 30067
Tong-Miin Liou
Department of Power Mechanical Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30043
J. Turbomach. Jul 1997, 119(3): 617-623 (7 pages)
Published Online: July 1, 1997
Article history
Received:
February 4, 1995
Online:
January 29, 2008
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Hwang, J., and Liou, T. (July 1, 1997). "Heat Transfer Augmentation in a Rectangular Channel With Slit Rib-Turbulators on Two Opposite Walls." ASME. J. Turbomach. July 1997; 119(3): 617–623. https://doi.org/10.1115/1.2841167
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