الفهرس 
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Abstract
This study was carried out to improve the performance of local fabricated cyclone to increase its efficiency and reduce the emissions of particles in air during the separation and air purification in many manufacturing and post-harvest processes that cause environmental and health harms. The cutting and manufacturing process of parts were by laser technology in a workshop of 10th of Ramadan industrial city.The parts of experimental unit (cylindrical part, conical part, vortex finder and dipleg) were designed, drawn and constructed at workshop of the Agricultural Engineering Department - Faculty of Agriculture, Suez-Canal University - Ismailia - Egypt.
Bulk density and size distribution of the materials particles under study (coarse wheat bran, ground yellow corn and plastic waste) were studied.Some of the operating and design parameters, such as inlet air velocity (14, 16, 18 and 20 m/s), cone height (30, 50 and 70 cm), vortex finder length (0, 10, 20, 30 and 40 cm) and dipleg length (25, 40 and 55 cm) were also studied to evaluate the performance of the experimental unit for optimal operating and design conditions to obtain the highest overall collection efficiency (ηo) and the lowest operating pressure drop(ΔP) for the materials under study.Some mathematical models were used to predict ηo, ΔP and cut-off diameter (d50) separated at 50 % efficiency and some statistical indicators for comparison and validation with measured results.
The results showed that the optimum operating and design parameters in the case of coarse wheat bran at cone height, vortex finder length and dipleg length were 70, 40 and 55 cm, respectively with inlet air velocity of 14 m/s leads to increase ηo to 99.93 % and decrease ΔP to 80.63 Pa. While it was at 50, 40 and 55 cm, respectively with inlet air velocity of18 m/s leads to increase ηo to 99.97 % and decrease ΔP to 121.52 Pa.In the case of ground yellow corn, it was at cone height, vortex finder length and dipleg length 30, 40 and 40 cm, respectively with inlet air velocity of 20 m/s leads to increase ηo to 99.98 % and decrease ΔP to 136.28 Pa.While in the case of plastic waste it was at cone height, vortex finder length and dipleg length 50, 20 and 40 cm, respectively with inlet air velocity of 18 m/s leads to increase ηo to 99.99 % and decrease ΔP to 129.47 Pa. While the optimum inlet air velocity of 18 m/s at vortex finder length 30 cm for the same cone height and dipleg length leads to increase ηo to 99.98 % anddecrease ΔP to 121.52 Pa. In spite of obtaining the same ηo at 20 m/s inlet air velocity while ΔP was increased to 124.92 Pa.
It is clear that, the cyclone performance was very complex and sensitive to any change in engineering design, operating conditions and material properties. Therefore, there is a wide range of operating and design parameters that lead to increase ηo and decrease ΔP based on the balance between the operating economies and the price of the material to be separated, this subject to the employer’s decision.
Keywords:Cyclone - Inlet air velocity - Vortex finder - Conical part - Overall collection efficiency - Pressure DROP - Mathematical models –Cut-off diameter (d50) - Coarse wheat bran - ground yellow corn - Plastic waste.