Numerical Simulation of the Tobacco Flavoring Nozzle by CFD

Abstract

This research focuses on the influence of the geometric parameters of the flavoring nozzle on the performance of the jet flow field, understands the atomization process, and masters the control method of the flavoring nozzle, so that the quality of the tobacco will be improved. Taking the flavoring nozzle of the tobacco industry as an example, this paper establishes a numerical calculation model of the flavoring nozzle, and simulates the atomization process of the single-phase airflow field, liquid flow field, and gas-liquid two-phase flow field by CFD software. The two-phase flow atomization was simulated mainly based on the volume of fluid (VOF) method with the large eddy simulation (LES) model. The simulation results show that the liquid flow can form a centrifugal ring liquid membrane structure with a certain crushing capacity at the nozzle outlet under the action of the cyclone at the inlet position, which lays the foundation for the adequate crushing of the liquid flow. The gas jet is the main reason for the adequate fragmentation of the liquid stream, which will be able to reduce the thickness of the ring centrifugal liquid membrane and increase the twisted destabilization deformation of the liquid membrane edge. When the high-speed gas jet stability interval formed at the axial position, the liquid stream will be fully fragmented into fine droplets.