A technique for direct measurement of local convective heat flux using interferometry

摘要

An interferometric procedure is described for measuring the local surface temperature gradient directly from a wedge (finite) fringe field. For a two-dimensional temperature field, it is shown that the local convective heat transfer coefficient can be obtained by measuring the angle of intersection of a fringe with an isothermal surface. Using an uncertainty analysis it is shown that this method gives the most accurate results for the measurement of relatively low gradients.