水平気流中に置かれた垂直加熱平板まわりの強制-自然直交流共存対流の流動と伝熱(熱工学,内燃機関,動力など)

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Experiments have been carried out for combined convective flows of air adjacent to the vertical heated plates in the uniform horizontal forced flows to investigate relationships between the flow and the heat transfer. The experiments cover the ranges of the Reynolds and modified Rayleigh numbers as; Re_L=160-2 300 and Ra^*_L=4.3×10^5-2.0×10^8. The flow fields over plates are visualized with particles and smoke. The results show that the stagnation point moves downward away from the center of the plates when the surface heat flux is beyond a critical value. The condition where the stagnation point begins to move is expressed with the non-dimensional parameters as; Gr^*_L/Re^<2.5>_L=0.15. Profiles of measured local heat transfer coefficients are smooth even at the stagnation points in all cases examined. When the buoyancy effect is sufficiently weak, the coefficients agree well with those of the wedge flow. With increasing the surface heat flux, the coefficients are augmented to approach asymptotically the boundary layer solution of natural convection along a vertical heated plate. Finally, forced, natural and combined convective flow regimes are classified by the non-dimensional parameter (Gr^*_L/Re^<2.5>_L).
一般社団法人日本機械学会の論文
2008-10-25