Numerical simulation of aerosol sampling from an air flow to an input tube

The processes of sampling (aspiration) to an input tube of an aspiration probe from an ambient air flow are studied numerically. The air flow is simulated on the basis of three-dimensional Navier–Stokes equations for an incompressible fluid. The method proposed allows calculation of the aspiration efficiency in the case of rather complicated shapes of the limiting trajectories of the particles. Dependences of the aspiration efficiency on the mean velocity of suction of air into the tube and the size of particles for a given free-stream velocity are obtained.