Natural Convection Heat Transfer in an Inclined Air Layer Packed with Spherical Particles

• Published in: Transactions of the Japan Society of Mechanical Engineers Series B Vol. 51; no. 471; pp. 3766 - 3771
• Main Authors: INABA, Hideo, SUGAWARA, Masahiro, FUKUDA, Takeyuki
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 25.11.1985
• Subjects: Inclined Porous Layer /Experimental Study
• ISSN: 0387-5016; 1884-8346
• DOI: 10.1299/kikaib.51.3766

Experiments of natural convection heat transfer in an inclined air layer with spherical particles under isothermal heating and cooling conditions were carried out for the ranges of inclination angles (θ=0180°), aspect-ratios (H/W=2.57.9), modified Prandtl numbers (P*r=1.145), ratios of diameter of spherical particles to width of the porous layer (d/W=0.040.516) and modified Rayleigh numbers (R*a=2.2×101.03×103). According to the inclination angle, the convection heat transfer in the porous layer varied because of the change of the convection flow type. In addition, useful correlations of non-dimensional convection heat transfer were derived in the relations Nusselt number Nu=f[P*r, d/W, R*a cos(θ-60°)] for θ=015°, and Nu=f[P*r, H/W, R*a (θ-60°)] for θ=0120°.