Abstract

A numerical simulation is performed on the deflection characteristics of the incident measuring light rays passing through the thermal boundary layer developing along an isothermally heated flat plate. The additional fringe order shift and fringe position displacement due to light deflection are calculated, and compensation for the deflection measurement uncertainty is mede by analyzing the fringes of real holographic interferograms. The validity of this compensation is confirmed by experiment on the combined free and forced convection flow field in the thermal entrance region of a horizontal rectangular duct with a constant wall temperature.

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