Aerosol particle deposition in numerically simulated channel flow

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Phys. Fluids A; (United States)

DOI:https://doi.org/10.1063/1.857344· OSTI ID:6393145

McLaughlin, J B

The trajectories of rigid spherical particles in a turbulent channel floware computed using a pseudospectral computer program to simulate thethree-dimensional, time-dependent flow field. It is assumed that the channel isvertical so that gravity cannot directly cause the deposition of particles onthe walls. The particles are assumed to be sufficiently small and widelyseparated so that their influence on the fluid velocity field can be ignored. Itis found that when the particles are assigned random initial locations withinitial velocities that are equal to the local fluid velocity, the particlestend to accumulate in the viscous sublayer. At the edge of the viscous sublayer,the particles that deposit on the wall typically possess normal components ofvelocity that are comparable in magnitude to the intensity of the normalcomponent of the velocity in the core of the channel (i.e., of the order ofmagnitude of the friction velocity). A shear-induced lift force having the formderived by Saffman for laminar flow is found to have virtually no effect onparticle trajectories, except within the viscous sublayer where it plays asignificant role both in the inertial deposition of particles and in theaccumulation of trapped particles. The Reynolds number of the particles thatdeposit does not remain small compared with unity.

• Research Organization: Department of Chemical Engineering, Clarkson University, Potsdam, New York 13676(US)
• OSTI ID: 6393145
• Journal Information: Phys. Fluids A; (United States), Journal Name: Phys. Fluids A; (United States) Vol. 1:7; ISSN PFADE
• Country of Publication: United States
• Language: English

Related Subjects

640410* -- Fluid Physics-- General Fluid Dynamics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AEROSOLS
COLLOIDS
COMPUTER CODES
CONFIGURATION
DENSITY
DISPERSIONS
ELECTRIC CHARGES
FLUID FLOW
GAS FLOW
GRAVITATION
LAMINAR FLOW
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
REYNOLDS NUMBER
SHEAR
SIZE
SOLS
SPHERICAL CONFIGURATION
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
TRAJECTORIES
TUBES
TURBULENT FLOW
VELOCITY
WALLS