Boundary conditions for the heat- and mass-transfer equations of coarsely disperse aerosols in a turbulent flow
Journal Article
·
· Journal of Engineering Physics and Thermophysics
OSTI ID:136118
- G.M. Krzhizhanovskii State Scientific-Research Power Institute, Moscow (Russian Federation)
Boundary conditions taking account of particle interaction with the boundary surface are obtained on the basis of the Chapman-Enskog method of solving the kinetic equation. In the turbulent flow of coarsely disperse aerosols in channels, the dynamic relaxation time of the particles considerably exceeds the lifetime of the energy-content pulsations of the carrying flux. In this case, processes occurring in the interaction of the discrete phase with the surface exert a significant influence on the dynamic and thermal characteristics of the disperse flow. In calculations of the turbulent disperse flows, the collision of particles with the walls is taken into account by formulating the corresponding boundary conditions for the hydrodynamic and heat- and mass-transfer equations. In [1-4], the boundary condition for the concentration of Brownian particles at a partially absorbing surface was constructed. The boundary concentration for the concentration of disperse impurity in the turbulent flow, taking account of inhomogeneity of the turbulent-pulsation field, the mass force, and the degree of particle entrainment in the turbulent motion, was found in [5]. The boundary conditions of [1-5] are conditions of the third kind for the particle-diffusion equations and relate the concentration value and its gradient at the surface. The distinguishing feature of these boundary conditions is the nonzero particle concentration at an absolutely absorbing wall. 13 refs.
- OSTI ID:
- 136118
- Journal Information:
- Journal of Engineering Physics and Thermophysics, Journal Name: Journal of Engineering Physics and Thermophysics Journal Issue: 4 Vol. 61; ISSN 1062-0125; ISSN JEPTER
- Country of Publication:
- United States
- Language:
- English
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