The dynamics of saturated vapor between two intersecting walls is examined. It shown that, if the angle $\phi$ sufficiently small, becomes unstable, and spontaneous condensation occurs in corner, similar to so-called capillary into a porous medium. As result, an ever-growing liquid meniscus develops near corner. diffuse-interface model lubrication approximation are used demonstrate that grows o...

Several experiments have evidenced the occurrence of saturation overshoots for flows in homogeneous porous media. Such phenomena are ruled out by standard mathematical models, which are based on equilibrium assumptions. In this presentation we discuss nonequilibrium models, in particular including dynamic effects in the capillary pressure. This leads to extensions of the classical Buckley-Lever...

The mechanical properties of a suspension can be dramatically altered by adding a small amount of a secondary fluid that is immiscible with the bulk phase. The substantial changes in the strength of these capillary suspensions arise due to the capillary force inducing a percolating particle network. Spatial information on the structure of the particle networks is obtained using confocal microsc...

Capillary adhesion is commonly present in ambient conditions. It can be measured single-asperity contacts through atomic force microscopy using a sharp probe that pulled off smooth substrate. However, for macroscopic multiasperity interfaces, the adhesive always close to zero because of elastic energy stored into deformation surface roughness; this known as paradox. Here, we experimentally show...

INTRODUCTION: Porous hydroxyapatite (HAp) has been used as a bone substitute instead of autogenous bone grafts because of no donor site morbidity, fewer complications, as well as osteoconductivity. Previously, we reported a novel unidirectional porous hydroxyapatite (UDPHAp) with a porosity of 75% and a microstructure consisting of cross-sectional oval pores (diameter, 100–300 μm) that penetrat...

The porous medium model of Green and Ampt, describing flow in porous media, appeared earlier than the capillary model of Washburn, although both lead to mathematically identical models. Here, the model of Green and Ampt was related to the Washburn model by an examination of the parameters involved in each. Fries et al. [N. Fries, M. Dreyer, J. Colloid Interface Sci. 320 (2008) 259-263] presente...

The problem of scattering of capillary waves by a semi-infinite dock with a porous undulatory sea bed is attempted using perturbation technique. Two different eigen function expansions of the velocity potential function on the two sides of the surface discont inuity are constructed. An integral expression for first order reflection coefficient is arrived at involving the bottom shape function. ...

The transient thermal response of a packed bed is investigated analytically. A local thermal nonequilibrium model is used to represent the energy transport within the porous medium. The heat flux bifurcation phenomenon in porous media is investigated for temporal conditions and two primary types of heat flux bifurcations in porous media are established. Exact solutions are derived for both the ...

a numerical investigation of forced convection in a channel with hot solid block inside a square porous block mounted on a bottom wall was carried out. the lattice boltzmann method was applied for numerical simulations. the fluid flow in the porous media was simulated by brinkman-forchheimer model. the effects of parameters such as porosity and thermal conductivity ratio over flow pattern and t...

Understanding of viscoelastic drop impact on porous solid surfaces emerges as the essential physics for broad industrial and biological systems. However, there have been few studies concerning post-drop transition considering rheological properties dynamics. Here, we report post-impact dynamics drops mesh using experimental theoretical analyses. Five concentrations highly viscous polymer soluti...