Opposing mixed convective flows of air induced over uniformly heated, upward-facing, inclined plates were investigated experimentally. The experiments covered the ranges of the Reynolds and modified Rayleigh numbers, Re L = 7.2 × 10 2 to 1 × 10 4 and Ra L * = 5 × 10 6 to 8 × 10 8 , and the inclination angles from θ = 15 to 75°f rom 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 trailing edge, and then the separation point shifts toward upstream with increasing the wall heat flux, and finally, reaches to the leading edge of the plates. It was also found that the separations at the trailing and leading edges are correlated well with the non-dimensional parameter as (Gr θ * /Re L 2.5 ) = 0.35 and 1.0, respectively. The local heat transfer coefficients of the inclined plates were also measured and the results showed that the above separation retards the heat transfer significantly from that of the forced convection. It was also revealed that the heat transfer by forced, natural, and combined convections can be classified with the above parameter as (Gr θ * / Re L 2.5 ) < 0.2, (Gr θ * )/Re L 2.5 ) > 3, and 0.2 < (Gr θ * /Re L 2.5 ) < 3, respectively.
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