An ultrasonic reflectivity method is proposed for measuring porosity and tortuosity of porous materials having a rigid frame. Porosity is the relative fraction by volume of the air contained within a material. Tortuosity is a geometrical parameter which intervenes in the description of the inertial effects between the fluid filled the porous material and its structure at high frequency range. I...

in this paper, turbulent mixed convective heat transfer of water and al2o3 nanofluid has been numerically studied in a horizontal tube under non-uniform heat flux on the upper wall and insulation in the lower wall using mixture model. for the discretization of governing equations, the second-order upstream difference scheme and finite volume method were used. the coupling of pressure and veloci...

In this paper, a finite element (FE) based model for the viscous and incompressible fluid flow through a regular porous media composed of rigid (immobile) particles/fibers is considered, and an analytical-numerical approach is employed to calculate the associated transverse permeability. The effects of an isotropy, i.e., the particle shape or orientation, as well as porosity, i.e., the volume f...

The variables controlled and measured in elastostatic laboratory experiments (the volume changes, shape changes, connning stresses, and pore pressure) are exactly related to the appropriate variables of poroelastic eld theory (the gradients of the volume-averaged displacement elds and the volume-averaged stresses). The relations between the laboratory and volume-averaged strain measures require...

Cortical bone contributes the majority of overall bone mass and bears the bulk of axial loads in the peripheral skeleton. Bone metabolic disorders often are manifested by cortical microstructural changes via osteonal remodeling and endocortical trabecularization. The goal of this study was to characterize intracortical porosity in a cross-sectional patient cohort using novel quantitative comput...

In the last decades, many works are going in direction of valorization vegetable biomass. The aim present work is to determine dynamic modulus elasticity a cementitious matrix composite with rice husk ash pozzolan reinforced sugarcane bagasse. To do this, we formulated mortars which varied volume fraction bagasse and kept 10% as cement replacement. fractions 0%, 3%, 6% yielded denoted RHA10, R1...

The mechanical properties of cancellous bone are fundamental in providing structural support and flexibility during physical activities. Characterization its behaviour were found crucial as information the elastic failure tissue may potentially be used to study effects drug treatments, aging disease at level. This aims present difference between compressive three-point bending loads. Cancellous...

The primary goal of this study was to assess peripheral bone microarchitecture and strength in postmenopausal women with type 2 diabetes with fragility fractures (DMFx) and to compare them with postmenopausal women with type 2 diabetics without fractures (DM). Secondary goals were to assess differences in nondiabetic postmenopausal women with fragility fractures (Fx) and nondiabetic postmenopau...

1 Flow in deformable porous media I 2 Abstract Many processes in the earth, such as magma migration, can be described by the ow of a low viscosity uid in a viscously deformable, permeable matrix. The purpose of this and a companion paper is to develop a better physical understanding of the equations governing these two-phase ows. This paper presents a series of analytic approximate solutions to...

The model developed by Springer and Tsai is extended using non-linear volume fraction in place of physical porosity for the effective thermal conductivity of composite materials with the help of local fractal techniques. The expression for non-linear volume fraction is obtained using data available in the literature. Present model is constructed in terms of fiber volume fraction, the fiber-matr...