The heat transfer coefficient distribution on a flat plate with a laminar boundary layer is investigated for the case of a transient thermal boundary condition (such as that produced with the transient measurement method). The conjugate problem of boundary layer convection with simultaneous wall conduction is solved numerically, and the predicted transient local heat transfer coefficients at several locations are determined. The numerical solutions for the surface temperature are used to determine the Nusselt number that would be measured in a transient method experiment for a range of (nondimensionalized) surface measurement temperatures (liquid crystal temperatures when they are used as the surface sensor). These predicted transient method results are compared to the well-known results for uniform temperature and uniform heat flux thermal boundary conditions. Measurements are made and compared to the numerical predictions using a shroud (transient) experimental technique for a range of nondimensional surface temperatures. The numerical predictions and measurements compare well and both demonstrate the strong effect of the (nondimensional) surface temperature on transient method measurements. Transient method measurements will give heat transfer coefficients that range from as low as that of the uniform temperature case to higher than that of the uniform heat flux case (a 36 percent difference). These results demonstrate the importance of the temperatures used with the transient method.
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The Effect of the Thermal Boundary Condition on Transient Method Heat Transfer Measurements on a Flat Plate With a Laminar Boundary Layer
R. J. Butler,
R. J. Butler
Department of Aeronautics, United States Air Force Academy, USAFA, CO 80840
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J. W. Baughn
J. W. Baughn
Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA 95616
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R. J. Butler
Department of Aeronautics, United States Air Force Academy, USAFA, CO 80840
J. W. Baughn
Department of Mechanical and Aeronautical Engineering, University of California, Davis, CA 95616
J. Heat Transfer. Nov 1996, 118(4): 831-837 (7 pages)
Published Online: November 1, 1996
Article history
Received:
May 29, 1995
Revised:
May 16, 1996
Online:
December 5, 2007
Citation
Butler, R. J., and Baughn, J. W. (November 1, 1996). "The Effect of the Thermal Boundary Condition on Transient Method Heat Transfer Measurements on a Flat Plate With a Laminar Boundary Layer." ASME. J. Heat Transfer. November 1996; 118(4): 831–837. https://doi.org/10.1115/1.2822577
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