THE ESTIMATION OF THE TEMPERATURE PROFILE IN A LAMINAR BOUNDARY LAYER WITH A SCHLIEREN METHOD.
BROWN UNIV PROVIDENCE R I
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Schlieren methods for heat-transfer measurement make use of ray deflections due to gradients of refractive index. The analysis of ray deflections is recapitulated briefly, and an experimental technique is described. A comparison between measured ray deflections and those predicted from analysis is made for natural convection over a horizontal heated cylinder, and good agreement is found. A transcendental temperature profile approximation function is described, and it is shown that this also gives good quantitative agreement with measured ray deflections. Finally, procedures are given by which it is possible to estimate the distribution of temperature and temperature gradient in a thermal boundary layer from ray deflection measurements, making use of the approximation function. The optical technique is established as a practical tool for quantitative study of temperature profiles in laminar boundary layers. Author