Transient Liquid Crystal Technique for Convective Heat Transfer on Rough Surfaces

[+] Author and Article Information
D. N. Barlow

Department of Aeronautics, United States Air Force Academy, Colorado Springs, CO

Y. W. Kim

Allied Signal Engines, Phoenix, AZ

L. W. Florschuetz

Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ

J. Turbomach 119(1), 14-22 (Jan 01, 1997) (9 pages) doi:10.1115/1.2841004 History: Received February 04, 1996; Online January 29, 2008


The local heat transfer coefficients are obtained on a rough planar surface simulating in-service turbine stator vane sections. A transient experimental technique is presented that permits the determination of local heat transfer coefficients for a rough planar surface using thermochromic liquid crystals. The technique involves the use of a composite test surface in the form of a thin foil of stainless steel with roughness elements laminated over a transparent substrate. Tests are conducted on a splitter plate to provide momentum boundary layer thicknesses to roughness heights appropriate for actual turbine stator vanes. Data are reported for two roughness geometries and two free-stream velocities. The range of Reynolds numbers along with the ratio of average roughness value to momentum thickness matches conditions encountered on the pressure side of the first-stage stator vanes in current high performance turbofan engines. A numerical simulation is conducted to validate the test method. Results for the rough surfaces investigated are compared with an available empirical relationship.

Copyright © 1997 by The American Society of Mechanical Engineers
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