Deposition of particles in laminar mixed-convection flow in a lid-driven cavity with heated obstacles

The transport and deposition of aerosol particles in laminar mixed-convection flow in a lid-driven cavity with two heated obstacles is investigated numerically by an Eulerian–Lagrangian method. Lagrangian particle transport calculation are carried out to track 2000 particles that initially randomly distributed in flow regime and also assumed that effect of particles on fluid are neglected. All the affecting forces on particle equation of motion, such as Brownian, Thermophoresis, Drag, lift and Gravity are considered. Reynolds number of the flow (defined by the velocity of the moving boundary, size of the cavity and fluid viscosity) is equal to 1000 and particles diameter is considered to be 1 μm for all the simulations. The objective of this paper is to study the effects of thermophoresis and free convection on deposition of particles on the obstacles. Results showed that thermophoresis decreases the deposition. Free convection is a parameter that influences the deposition. It is observed that deposition decrease while the Richardson Number increases.

Keywords:

Cavity , Laminar mixed convection flow , Thermophoresis Effect , Deposition of Particle , Obstacle