Results 251 to 260 of about 179,449 (293)

Nonlocal convection–diffusion problems and finite element approximations

Computer Methods in Applied Mechanics and Engineering, 2015
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Tian, Hao, Ju, Lili, Du, Qiang
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Multigrid solution and grid redistribution for convection–diffusion

International Journal for Numerical Methods in Engineering, 1989
AbstractWe examine multigrid solution for convection–diffusion problems in which convective effects are significant. In particular, we consider the case where the fine grid satisfies the associated cell or diagonal dominance condition but coarse grid levels violate this condition. Related numerical experiments are conducted.
Carey, G. F., Pardhanani, A.
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Thermal Diffusion and Convective Stability. II. An Analysis of the Convected Fluxes

The Physics of Fluids, 1972
The stability of a horizontal, two-component fluid layer subjected to a positive vertical temperature gradient (heating from above) is investigated taking advantage of the fact that the time scales for thermal relaxation and concentration relaxation are widely separated.
Velarde, M. G., Schechter, R. S.
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Mass Transfer by Diffusion and Convection

2018
Transfer of mass, in the sense of chemical or biological species, is the third and last physical mechanism we encounter: with the analysis of diffusion and mass convection a preliminary outlook on transfer phenomena is completed. Strong similarities exist between heat and species transport: we will use our acquired knowledge to describe the species ...
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Convective and absolute instabilities of double-diffusive convection with shear

Physics of Fluids
In this study, we investigate the spatiotemporal instability of double-diffusive convection with and without a Couette flow, focusing mainly on the characters of transverse rolls. In the absence of shear, double-diffusive convection is always absolutely unstable even in the oscillatory instability regime, which is different from other flows that can ...
Cailei Lu, Mengqi Zhang, Kang Luo, Hongliang Yi   +3 more
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Diffusion and convection of heat in a dipole convection field

Mathematical Proceedings of the Cambridge Philosophical Society, 1970
AbstractThe problem of the diffusion and convection of heat from an arbitrarily placed source in the convection field due to a fluid producing dipole is considered. The solution for the temperature at any point in the fluid is found analytically. The isotherms and lines of constant flux are plotted.
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Segregation of granular media by diffusion and convection

Physical Review E, 2001
A diffusion-convection equation is used to model granular segregation within a mixture of particles of different size, shape, or surface structure in a vertical vessel. Convection describes competition between species in vertical direction whereas random noise (shaking) allows particles to exchange positions. For two species it is shown that the moving
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Convection, Diffusion, and Electric Current Through a Membrane

Acta Physiologica Scandinavica, 1966
AbstractA system containing 2 compartments separated by an artificial wide pore membrane, was used to study the relationship of diffusion, water flow and electric current. Various hydrostatic pressures were obtained by experimentally chosen values of flow and current. For a solution of KCl + LiCl, stationary state ionic concentration ratios (Eq. 3) and
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Calculation of Combined Diffusive and Convective Mass Transfer

The International Journal of Artificial Organs, 1982
The clearance of a dialyzer is calculated under the most general conditions, allowing not only for a mixed diffusive and convective mass transfer, but also for a variation along the membrane of the local ultrafiltration, the membrane permeability and the sieving coefficient. The study is then carried on for the case in which these are all constant, to
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Diffusion and Convection in Porous Media

2013
In this chapter the correct mathematical models of a diffusion-convection in porous media is derived from the homogenization theory. The mathematical model at the microscopic level consist of the Stokes system for an incompressible viscous liquid occupying a pore space and the Lame’s system for an incompressible solid skeleton, coupled with a diffusion-
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