A Comparison of the Transient and Heated-Coating Methods for the Measurement of Local Heat Transfer Coefficients on a Pin Fin

被引:45
作者
Baughn, J. W. [1 ]
Ireland, P. T. [2 ,3 ]
Jones, T. V. [2 ,3 ]
Saniei, N. [1 ]
机构
[1] Univ Calif Davis, Dept Mech Engn, Davis, CA 95616 USA
[2] Univ Oxford St Annes Coll, Oxford OX2 6HS, England
[3] Univ Oxford, Dept Engn Sci, Oxford OX2 6HS, England
来源
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME | 1989年 / 111卷 / 1-4期
关键词
Finned Surfaces; Flow Separation; Measurement Techniques;
D O I
10.1115/1.3250800
中图分类号
O414.1 [热力学];
学科分类号
摘要
Measurements of the local heat transfer coefficients on a pin fin (i.e., a short cylinder in crossflow) in a duct have been made using two methods, both of which employ liquid crystals to map an isotherm on the surface. The transient method uses the liquid crystal to determine the transient response of the surface temperature to a change in the fluid temperature. The local heat transfer coefficient is determined from the surface response time and the thermal properties of the substrate. The heated-coating method uses an electrically heated coating (vacuum-deposited gold in this case) to provide a uniform heat flux, while the liquid crystal is used to locate an isotherm on the surface. The two methods compare well, especially the value obtained near the center stagnation point of the pin fin where the difference in the thermal boundary condition of the two methods has little effect. They are close but differ somewhat in other regions.
引用
收藏
页码:877 / 881
页数:5
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