TY - JOUR TI - Filtration efficiency of a cigarette filter with X- or Y-shaped fibers AU - Yang Zhanping JN - Thermal Science PY - 2019 VL - 23 IS - 4 SP - 2517 EP - 2522 PT - Article AB - Nicotine is harmful to the health of smokers and the inhalation of second-hand smoke is more harmful. A high efficiency of nicotine filtration for a cigarette filter is much needed. This paper suggests a formulation to predict filtration efficiency of a filter with X- or Y-shaped fibers. Main effects affecting the efficiency are elucidated using a fractal modification of the Darcy's law.