Numerical and experimental studies of particle deposition in a tube with a conical contraction—Laminar flow regime

摘要: Abstract Particle deposition in a tube with conical contraction was studied numerically and experimentally. In the numerical study, an axisymmetric laminar flow field obtained by solving Navier-Stokes equations cylindrical coordinates control volume method SIMPLER algorithm of Patankar (1982, Numerical Heat Transfer Fluid Flow. Hemisphere, New York). efficiencies on surfaces were calculated tracing particle trajectories field. The mechanisms considered for included inertial impaction interception. Through parametric general equation, giving relative efficiency as function modified Stokes number, to characterize angle smaller than 60°. For larger 75°, results coincided those Ye Pui (1990, J. Aerosol Sci. 21, 29). validated experimental results. vibrating orifice aerosol generator used produce monodisperse oleic acid test aerosols tagged uranine tracer. Deposition determined recovering deposited particles measuring concentration using fluorometer. give good agreement