Thermophoretically augmented mass transfer rates to solid walls across laminar boundary layers

Journal Article · Wed Jan 01 04:00:00 EST 1986 · AIAA J.; (United States)

OSTI ID:5812278

Gokoglu, S A; Rosner, D E

Predictions of mass transfer (heavy vapor and small particle deposition) rates to solid walls, including the effects of thermal (Soret) diffusion (thermophoresis for small particles), are made by numerically solving the two-dimensional self-similar forced convection laminar boundary-layer equations with variable properties, covering the particle size range from vapor molecules up to the size threshold for inertial (dynamical nonequilibrium) effects. The effect of thermophoresis is predicted to be particularly important for submicron particle deposition on highly cooled solid surfaces, with corresponding enhancement factors at atmospheric conditions being over a thousand-fold at T(w)/T(e) equal to about 0.6. As a consequence of this mass transfer mechanism, the particle size dependence of the mass transfer coefficient to a cooled wall will be much weaker than for the corresponding case of isothermal capture by Brownian-convective diffusion. 46 references.

• Research Organization: NASA, Lewis Research Center, Cleveland, OH; Yale Univ., New Haven, CT
• OSTI ID: 5812278
• Journal Information: AIAA J.; (United States), Journal Name: AIAA J.; (United States) Vol. 24; ISSN AIAJA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY-VALUE PROBLEMS
CONVECTION
DATA
DIFFUSION
ENERGY TRANSFER
FLUID FLOW
FORCED CONVECTION
HEAT TRANSFER
INFORMATION
LAMINAR FLOW
MASS TRANSFER
MATHEMATICS
NUMERICAL ANALYSIS
NUMERICAL DATA
PHYSICAL PROPERTIES
PRANDTL NUMBER
REYNOLDS NUMBER
SPECIFIC HEAT
THEORETICAL DATA
THERMAL DIFFUSION
THERMODYNAMIC PROPERTIES