Local measurements of turbulent boundary layer heat transfer on a concave surface using liquid crystals
Abstract
The goal of the current experiment was to determine whether or not there are largescale structures visible in the distribution of heat transfer coefficient on a concave surface. The heat transfer measurements were taken using a new technique which uses cholesteric liquid crystals to determine surface temperature, in conjunction with a surface of known heat release per unit area. This technique permits an instantaneous visualization of heat transfer coefficient over a large area. The response rate of the package is high enough to include the important dynamics of the transport processes. A mixing length model for concave curvature was applied to STAN5, an existing, finitedifference computer program. This model is shown to successfully predict mean heat transfer rates in concavely curved turbulent boundary layers. It was shown that the outerlayer mixing length distribution was not an important variable in predicting heat transfer rates for water (Pr = 5).
 Publication:

Ph.D. Thesis
 Pub Date:
 1983
 Bibcode:
 1983PhDT........51S
 Keywords:

 Concavity;
 Heat Transfer;
 Turbulent Boundary Layer;
 Computer Programs;
 Finite Difference Theory;
 Liquid Crystals;
 Surface Temperature;
 Fluid Mechanics and Heat Transfer