下向き傾斜加熱平板に沿う強制-自然対向流共存対流の流動と伝熱(熱工学,内燃機関,動力など)

概要

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Experimental investigations have been carried out for opposing mixed convective flows of air adjacent to downward-facing, inclined heated plate. The experiments covered the ranges of the Reynolds and modified Rayleigh numbers as; Re_L=400-4600 and Ra^*_L=1.0×10^7-5.4×10^8, and the inclination angles as; (θ=15 to 75° from horizontal. The flow fields over plates were visualized with smoke. The results showed that a separation of forced boundary layer flow occurs first at the bottom edge of the plate, and then, the separation point shifts toward upstream with increasing the wall heat flux, and finally, reaches to the top edge of the plates. It was found that the separations at the bottom and top edges are predicted with the non-dimensional parameter as; (Gr^*_<Lθ>/Re^<2.5>_L)=0.35 and 1.0, respectively. The local heat transfer coefficients of the inclined plates were also measured and the results showed that minimum coefficients appear in the separation region. Moreover, it was revealed that the forced, natural and combined convective flows can be classified by the non-dimensional parameter (Gr^*_<Lθ>/Re^<2.5>_L).
一般社団法人日本機械学会の論文
2008-04-25