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Abstract
The object of the present investigation is to numerically study the flow distribution inside enclosure. The effect of aspect ratio, area ratio between exit and inlet slots and the effect of air inlet angle are taken into consideration. Also, as heat and contaminant sources usually co-exit indoors, the present work is to numerically study the double-diffusion mixed convection in a ventilated enclosure due to the discrete heat and contaminant
sources.
Based on the governing equations; the fluid, heat and contaminant transport processes are respectively described by the corresponding streamlines, isothermal lines, and iso-concentration lines. Attentions are given to analyze the effects of the main factors the strength of heat source indicated by the Orashof number (Or), the strength of contaminant source by the buoyancy ratio (Br), the strength of ventilation by the Reynolds number (Re), and the ventilation mode on the indoor air environment. Also the effect of air inlet and exit slot position is studied. Another factor is the effect of inlet angle on cell formation. Numerical results, presented by the contour function lines, namely, streamlines, isothermal lines, and iso-concentration lines, illustrated that the indoor air, heat and contaminant transport structures are mainly determined by the interaction between the internal buoyancy natural convection induced by the discrete heat/contaminant sources and the external forced convection driven by the mechanical ventilation. Finally, the effect of ventilation system in the fly fiber diffusion in textile mill is established.