Study On Fluid Dynamics Simulation Of Cigarette Smoke Filtration

Cigarette smoke has the risk of cancer,which is caused by the concentration of carcinogens to the particles produced during cigarette combustion.The particles are inhaled into the lungs of smokers through mainstream smoke.There are a large number of smokers in China,and the consumption of cigarettes also leaps to the forefront of the world.The research on cigarettes can reduce the harm of cigarettes to human body and realize the healthy development of the industry.Because it is difficult to conduct reliable research on the smoke flow in cigarette by experimental research,the numerical method is used to model the combustion process of cigarette to simulate the flow in cigarette,and then the spatial distribution of smoke particles in cigarette can be obtained,so as to explore various factors affecting the particle size distribution,so as to optimize the structure of cigarette and bring more benefits Small health effects and better suction experience.In this paper,firstly,a mathematical model of cigarette combustion process is established,and the pressure,temperature and air velocity distribution in the process of cigarette combustion are numerically simulated.User defined function(UDF)is used to solve the reaction rate of pyrolysis precursor and coke.At the same time,UDF function is used to help solve the changes of cut tobacco permeability,specific surface area and thermal conductivity.The temperature distribution,pressure distribution,oxygen and CO concentration distribution of cigarette under different suction pressure were observed and summarized.The distribution rules of pyrolysis and oxidation rate of cigarette under different suction pressure were studied.The basic rules of the influence of various parameters on cigarette combustion process were obtained,and the internal mechanism of these basic rules was explained.Based on the combustion model,the spatial distribution of the number,concentration and diameter of the smoke particles in the cigarette was simulated by the user-defined scalar(UDS)function.According to the characteristics of the smoke particles,the collision and growth of the smoke particles were mainly simulated The mass ratio is very small(far less than 10%),so the volume of particles and the momentum exchange between particles and air are ignored.The spatial distribution of the quantity,concentration and size of particulate matter in cigarette smoke under different suction pressure was observed and summarized,and the influence of different suction rate on the filtration law of cigarette smoke was studied.The basic laws of the influence of various parameters on the distribution law of cigarette smoke were obtained,and the influencing factors of these basic laws were discussedThe numerical simulation work in this paper has laid a certain foundation for further exploring the formation mechanism of cigarette smoke particles,revealing the essential laws affecting the toxicity and carcinogenicity of cigarette smoke,and optimizing the cigarette structure and cut tobacco composition,so that it can be better applied in industry.