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

• Published in: International journal of heat and mass transfer Vol. 37; no. 12; pp. 1759 - 1771
• Main Authors: Ammouri, F.El, Taine, J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1994; Elsevier
• Subjects: Convection and heat transfer; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Instrumentation for fluid dynamics; Physics; Turbulent flows, convection, and heat transfer; Temperature distribution; Turbulent flow; Pipe flow; Measuring methods; Optical method; Air; Experimental study; Laser beams; Heat transfer
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/0017-9310(94)90065-5

The wall conductive flux in gas for a turbulent and homogeneous flow in a channel is directly deduced from a laser beam deflection technique. 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 × 10 4−3.5 × 10 4 and a temperature gradient in the range 60–120 K mm −1 agree with the results of a two-dimensional turbulence model when taking into account all uncertainty causes.