Dynamics of Tobacco Smoke under Resonant Oscillations in a Closed Tube

Resumo

The dynamics of tobacco smoke is studied experimentally with nonlinear oscillations in a closed tube. The oscillations of a polydisperse gas suspension at a basic frequency are excited by a flat piston in the transition regime to shock waves by via a vibration test rig. The effect of the oscillation amplitude and the height of a tube filled with tobacco smoke on the rate of its coagulation and sedimentation is studied. Different cases of smoke-filled tubes are considered: full, three-quarter, half, and quarter fillings. The concentration of tobacco smoke decreases monotonically in time, which is associated with particle coagulation and sedimentation. This process is accelerated by several hundred times as compared with natural sedimentation. The dependence of the coagulation and sedimentation of tobacco smoke on the height of tube filling is nonmonotonic and reaches a minimum with a half-filled tube. The change in the amplitude of piston displacement significantly influences the coagulation and sedimentation rate of tobacco smoke only with a full tube. This is associated with the generation of acoustic flows in the form of toroidal vortices in the tube.