Measurement of endwall heat transfer and pressure drop in a pin-fin wedge duct |
| |
Authors: | Jenn-Jiang Hwang Chau-Chin Lui |
| |
Affiliation: | Department of Mechanical Engineering, Chung-Hua University, Hsinchu 300, Taiwan, ROC |
| |
Abstract: | This paper discusses the measurements of endwall heat transfer and pressure drop in a wedge-shaped duct inserted with an array of circular pin fins. The endwall surface is coated with a thin layer of thermochromic liquid crystals and a transient test is run to obtain detailed heat transfer distributions. Parametric studies include Reynolds number (10,000?Re?50,000), outlet flow orientation (straight and lateral) and pin configuration (staggered and in-line). The wedge duct has a convergent angle of 12.7°. The pin spacing-to-diameter ratios along the longitude and transverse directions are fixed at sx/d=sy/d=2.5. Pin-less wedge duct results are also obtained for comparison. Results indicated that the straight wedge duct with a staggered pin array is most recommended because of its significant endwall heat transfer and moderate pressure-drop penalty; while the turned wedge duct with a staggered pin array is least recommended since it yields the highest pressure drops and raises severe hot spots. A similarity of the pin Reynolds-number dependence of row-averaged Nusselt number is developed in the present wedge duct of accelerating flow. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|