20 research outputs found
Simulating liquid-vapor phase separation under shear with lattice Boltzmann method
We study liquid-vapor phase separation under shear via the Shan-Chen lattice
Boltzmann model. Besides the rheological characteristics, we analyze the
Kelvin-Helmholtz(K-H) instability resulting from the tangential velocity
difference of the fluids on two sides of the interface. We discuss also the
growth behavior of droplets. The domains being close to the walls are
lamellar-ordered, where the hydrodynamic effects dominate. The patterns in the
bulk of the system are nearly isotropic, where the domain growth results mainly
from the diffusion mechanism. Both the interfacial tension and the K-H
instability make the liquid-bands near the walls tend to rupture. When the
shear rate increases, the inequivalence of evaporation in the upstream and
coagulation in the downstream of the flow as well as the role of surface
tension makes the droplets elongate obliquely. Stronger convection makes easier
the transferring of material particles so that droplets become larger.Comment: Science in China (Series G) (in press
THREE-DIMENSIONAL MODELING OF THE EVAPORATIONOFVOLATILE HYDROCARBONS FROM ANISOTROPIC POROUS MEDIA
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A 2-D Pore-Network Model of the Drying of Single-Component Liquids in Porous Media
The drying of liquid-saturated porous media is typically approaching using macroscopic continuum models involving phenomenological coefficients. Insight on these coefficients can be obtained by a more fundamental study at the pore- and pore-network levels. In this report, a model based on pore-network representation of porous media that accounts for various process at the pore-scale is presented. These include mass transfer by advection and diffusion in the gas phase, viscous flow in liquid and gas phases and capillary effects at the gas-liquid menisci in the pore throats