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Natural Convection From Vertically Stacked Inclined Cylinders


 While there are published correlations dealing with average natural convection coefficients from a single horizontal, vertical, or inclined cylinder, there do not appear to be any for vertically stacked inclined cylinders. This study investigates natural convection from parallel inclined cylinders spaced two diameters apart in a low Rayleigh number range and Nusselt-Rayleigh number correlations are presented for this case. Convection coefficients generally decreased for both rods as the angle of inclination increased (from horizontal to vertical) and were consistently higher for the bottom rod in all configurations except vertical. Convection from the top cylinder appears to be impaired at this close spacing. Comparisons of the data to modified versions of various horizontal and one inclined cylinder formulation show that while predicted Nusselt numbers have similar trends, no single equation is a good predictor for both rods in this Rayleigh number range.