Thermophoresis of a radiating aerosol in laminar boundary-layer flow

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Journal of Thermophysics and Heat Transfer; (United States)

DOI:https://doi.org/10.2514/3.385· OSTI ID:7265343

Jia, G; Cipolla, Jr, J W; Yener, Y ^[1]

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1. Northeastern University, Boston, MA (United States)

The interaction between radiation and thermophoresis in forced convection laminar boundary-layer flow over an impermeable flat plate is investigated. The fluid is a radiatively nonparticipating constant-property gas containing emitting, absorbing, and isotropically scattering gray aerosol particles. The radiative properties of the gas-aerosol mixture are considered to be proportional to the local concentration of the particles in the mixture. The surface of the plate, maintained isothermal at a temperature lower than the freestream temperature, is assumed to be opaque, gray, and diffusely emitting and diffusely reflecting. Formal relations developed to the radiation part of the problem based on the Galerkin method are used together with the discretized forms of the energy and particle conservation equations to solve the problem numerically through an iterative scheme. The results show that radiation increases both the temperature gradients in the vicinity of the surface and the total heat flux to the surface, but decreases both the concentration of particles at the surface and the particle flux to the surface. It is also shown that with strong radiation the thermal boundary-layer thickness can increase up to one order of magnitude larger than the velocity boundary-layer thickness with an insignificant increase in the concentration boundary-layer thickness. 23 refs.

• OSTI ID: 7265343
• Journal Information: Journal of Thermophysics and Heat Transfer; (United States), Journal Name: Journal of Thermophysics and Heat Transfer; (United States) Vol. 6:3; ISSN 0887-8722; ISSN JTHTE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
AEROSOLS
BOUNDARY LAYERS
COLLOIDS
CONVECTION
DIFFUSION
DISPERSIONS
ENERGY TRANSFER
FLUID FLOW
FORCED CONVECTION
GALERKIN-PETROV METHOD
HEAT TRANSFER
ITERATIVE METHODS
LAMINAR FLOW
LAYERS
MASS TRANSFER
NUMERICAL SOLUTION
PLATES
RADIANT HEAT TRANSFER
SOLS
THERMAL DIFFUSION
THERMOPHORESIS