Considered the characteristics of porous medium in coal seam and goaf, order to reflect accurately influence various media against gas flow, mathematical model discrete multi-scale network macroscopic CFCM (Coal-Fracture-Cavity-Model), was presented. The is classified into matrix, fracture hole systems based on size, matrix system includes micro fractures micro-porous. can be regarded as diffus...

We develop and present a unified multi-scale model (involving three scales of spatial organisation) to study the dynamics of rigid aggregating particles suspended in a viscous fluid medium and subject to a steady poiseuille flow. At micro-level, the theory of adhesion describing the attachment / detachment kinetics of two rigid spheres coated with binding ligands, is utilized to describe the co...

In this paper we study the filtration laws for the polymeric flow in a porous medium. We use the quasi-Newtonian models with share dependent viscosity obeying the power-law and the Carreau’s law. Using the method of homogenization in [5] the coupled micro-macro homogenized law, governing the quasi-newtonian flow in a periodic model of a porous medium, was found. We decouple that law separating ...

In order to simulate red blood cell (RBC) behaviors in a flowing blood, we developed a mathematical model of an elastic RBC and their multi-body interaction based on the minimum energy principle. The results showed realistic behavior of multiple RBCs in a straight artery as well as single RBC behavior in a uniform shear flow including tumbling and tank treading motion observed in experiments. N...

Key Idea Wide-scale usage of carbon nanotubes (CNTs) is predicated on the development of robust, large-scale manufacturing techniques. The key challenges to developing such techniques can be grouped into three categories: growth, handling, and functionalization. The nanopelleting concept, devised by a research team in the Micro & Nano Systems Laboratory at MIT, seeks to address these challenges...

the permeability and tortuosity of pore-scale two and three-dimensional random porous media were calculated using the lattice boltzmann method (lbm). effects of geometrical parameters of medium on permeability and tortuosity were investigated as well. two major models of random porous media were reconstructed by computerized tomography method: randomly distributed rectangular obstacles in a uni...

A digital imaging technique is used to characterize pore-scale structures and to predict fluid flow at the scale. Heterogeneity at the pore-scale can be assessed by the micro-Computed Tomography (micro-CT), which provides complicated boundary conditions of porous media, and it can also be identified by the numerical flow simulation using the lattice-Boltzmann method (LBM) on the digital image. ...

The rapid growth of applications of lab-on-chip and bio-MEMES (Micro-electromechanical systems), arranging from cell culture and drug delivery to the microscale energy harvesting, microelectronics cooling, requires an understanding of microfluidic flow. Surface roughness, even at micro and nano scale, both deterministic and random, is considered an important parameter to affect fluid flow at th...