Measurement of wall conductive heat flux in turbulent gas flow by laser beam deflection.

The main advantage of this method is the elimination of the radiative flux contribution. The beam deflection is due to the refractive index gradient field induced by a temperature gradient field at constant pressure. Experimental data are treated by using a parameter estimation method. Experimental fluxes associated with Reynolds number based on the hydraulic diameter in the range 1.75 x 10,000 - 3.5 x 10,000 and a temperature gradient in the range 60-120 K/mm agree with the results of a two-dimensional turbulence model when taking into account all uncertainty causes.