Analysis of parametric instability of cigarettes based on computational fluid dynamics methods

Area of Science:

• Tobacco Science
• Materials Engineering
• Fluid Dynamics

Background:

• Production of cigarettes exhibits significant variability in ventilation rate and smoking resistance.
• These fluctuations are often linked to inconsistencies in ventilation hole numbers and material porosity.

Purpose of the Study:

• To investigate the impact of component porosity variations on cigarette ventilation rate and smoking resistance.
• To identify the primary factors contributing to fluctuations in these critical cigarette parameters.

Main Methods:

• Computational fluid dynamics (CFD) simulations were employed to analyze the effects of minor porosity changes.
• Analysis focused on the influence of joint paper ventilation holes, filter tow, cut tobacco, cigarette paper, packaging paper, and shaped paper porosity.

Main Results:

• Variations in the effective number of ventilation holes due to gluing had minimal impact on production-level ventilation and resistance.
• Smoking resistance is predominantly affected by the structural parameters of filter tow and the cut tobacco section.
• Cigarette paper and packaging paper porosity positively correlate with ventilation rate, while cut tobacco and filter tow porosity show a negative correlation.
• Shaped paper exhibited the least influence on ventilation rate.

Conclusions:

• Component porosity, particularly of filter tow and cut tobacco, significantly impacts cigarette smoking resistance and ventilation.
• Optimizing cigarette paper and packaging paper porosity can enhance ventilation rates.
• The findings provide a basis for optimizing cigarette manufacturing processes and stabilizing ventilation rates.