Experimental study of natural convection in an inclined air layer

Abstract The natural convection motion and heat transfer rate in an inclined rectangular air layer, in which two opposing isothermal rigid-boundaries were kept at different temperatures, were investigated experimentally for various angles of inclination, θ = 0°–180°, various aspect ratios, H W = 5–83 (height to width of rectangular cavity), and Rayleigh numbers, Raw = 1.2 × 103−2 × 106. Flow patterns in two planes (X−Y and Y−Z planes) which met at right angles to each other were visualized for various factors mentioned above. Moreover, the non-dimensional correlation equations of the heat transfer rate across the air layer were derived in the relationship between the Nusselt number, Nuw, and the modified Rayleigh number, Raw cos θ for 0° ⩽ θ ⩽ 60° or Rawsinθ for 60°

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