The effects of nozzle process parameters on liquid atomization in the tobacco leaf casing process
To improve the issue of leaf adhesion in the tobacco blending process,the spray effect was optimized through CFD numerical simulation to enhance the absorption of the liquid by the tobacco leaves and reduce adhesion.The effects of initial droplet velocity,incident horizontal angle,nozzle half-angle,and other factors on the atomization performance of a liquid nozzle were investigated through orthogonal experiments.The results indicate that the initial droplet velocity has the most significant impact on atomization performance,followed by the incident horizontal angle.Single-factor experiments were conducted on these two factors and the viscosity of the liquid,and it was found that when the initial droplet velocity increases from 100 m/s to 400 m/s,the Sauter Mean Diameter(SMD)of the droplets in the atomization field decreases from 82.75 μm to 14.37 μm,with a noticeable improvement in atomization directionality and uniformity.Adjusting the incident horizontal angle from 20° to 35° shows that at a horizontal angle of 25°,the atomization area is larger and the SMD is finer.The response surface analysis indicates that the interaction between the initial velocity of the droplet and the horizontal angle of the nozzle is not significant.Under high-speed airflow,liquid viscosity has a greater influence on smaller droplets than larger ones in the atomization field.Finally,experimental validation shows that the improved nozzle design significantly reduces the weight of adhered tobacco leaves in the roller,bringing it down to less than 0.31 kg per batch.The research findings can effectively reduce the amount of adhesive used in the tobacco blending process and provide theoretical support for optimizing the atomization effect.
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