Thermophoretic deposition efficiency of particles in flow along an annular cross-section

Thermophoresis is an important mechanism of micro-particle transport due to a temperature gradient in the surrounding medium and has found numerous applications, especially in the field of aerosol technology. This study investigates the thermophoretic deposition efficiency of particles in laminar gas flow in a concentric annulus using the critical trajectory method numerically. The governing equations include the momentum and energy equations for the gas and the particle equations of motion. The effect of the annulus size and the ratio of inner to outer tube wall temperature on the deposition efficiency were studied. Simulation results suggest that thermophoretic deposition increases with increasing thermal gradient, deposition distance, and the ratio of inner to outer radius.

Keywords:

Thermophoresis , thermophoretic deposition efficiency , particle deposition , annulus