Abstract
A two wavelength holographic interferometer is used to obtain heat transfer coefficient in a turbulent two-dimensional thermal boundary layer. This type of flow problem imposes some restrictions on the interpretation of interferometric data particularly in regions of the flow where large turbulence eddies exist. However, in the region of the flow near a heated wall, optical measurements of both temperature and temperature gradient are obtained by utilising different wavefront reconstruction optics. The heat transfer coefficients are inferred from this data by a statistical curve fitting procedure which utilizes redundant data to minimize any dependence on individual measurement error. The resulting curves are used to perform the extrapolations to obtain wall values.
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