Two dimensional free convective heat transfer within a parallelogram shaped enclosure has been investigated. Numerical calculations are carried out under the condition chat the infinite number of enclosures of the same shape are piled up vertically and every parting plate has no thickness. Parameter values are : Prandtle number 0.72, aspect ratios 0.25 to 2, oblique angles -π/3 to π/3 and Rayleigh numbers 1 to about 106. Heat transfer coefficients on the hot wall are measured for air under the condition that 5 enclosures of the same shape are piled up vertically and very thin films are used for the parting plates. Experimental results are compared with numerical ones.
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Asako et al. (1982) studied this question.