In this work we present measurements of permeability, effective porosity and tortuosity on a variety of rock samples using NMR/MRI of thermal and laser-polarized gas. Permeability and effective porosity are measured simultaneously using MRI to monitor the inflow of laser-polarized xenon into the rock core. Tortuosity is determined from measurements of the time-dependent diffusion coefficient us...

Antidiuretic hormone (ADH) induces a large increase in the water permeability of the luminal membrane of toad urinary bladder. Measured values of the diffusional water permeability coefficient, Pd(w), are spuriously low, however, because of barriers within the tissue, in series with the luminal membrane, that impede diffusion. We have now determined the water permeability coefficient of these s...

Reservoir permeability is a critical parameter for characterization of the hydrocarbon reservoirs. In fact, determination of permeability is a crucial task in reserve estimation, production and development. Traditional methods for permeability prediction are well log and core data analysis which are very expensive and time-consuming. Well log data is an alternative approach for prediction of pe...

This study treats the optimised one-port (reflection coefficient) and two-port (shunt-through/series-through) measurement methods for complex permeability determination of solid soft magnetic materials using a vector network analyzer (VNA) at frequencies from 9 kHz to 6.5 GHz. The principle of measurement methods, the relationships of measured phasor voltage ratio (Sparameter) to complex impeda...

In this study, effects of microstructure on the viscous permeability and Forchheimer coefficient of monodispersed fibers are investigated. The porous material is represented by a unit cell which is assumed to be repeated throughout the medium. Based on the orientation of the fibers in the space, fibrous media are divided into three categories: one-, two-, and three-directional (1D, 2D, and 3D) ...

This paper presents preliminary experimental results on the measurement of the air permeability coefficient in a concrete sample that has been subjected to constant pressure differences of 5 and 10 Pa (3.45 x 1 0 ' ~ 6.90 x 1u2 psi). This experimental model simulates indoor radon gas entry by advection. A reliable air permeability system was designed to perform laboratory measurements on concre...

The permeability coefficients obtained by means of an infinite dose diffusion cell system with nude mouse skin in vitro were compared to the ether-water partition coefficients of the following compounds: glucose, urea, glycerol, thiourea, alkanols (methanol to octanol), hydrocortisone and hydrocortisone 21-n-alkyl esters (-acetate to -heptanoate). The permeability coefficients ranged from 1.0 x...

In this study, we analyze the effects of membrane properties, namely water permeability, solute permeability, and structural parameter, on the overall performance of an FO membrane module to extract water from simulated seawater (0.6 M NaCl). By considering the thermodynamic limit of operation, we demonstrate that the maximum achievable water recovery is practically independent of membrane prop...

The propagation of slow compressional waves in air-saturated permeable solids was studied by experimental means between 10 and 500 kHz. The velocity and attenuation coefficient were measured as functions of frequency from the insertion delay and loss of airborne ultrasonic waves transmitted through thin slabs of 1-5 mm in thickness. Porous ceramics of 2-70 Darcy and natural rocks of 200-700 mDa...

In this study, effects of porosity and fiber orientation on the viscous permeability and Forchheimer coefficient of mono-dispersed fibers are investigated. The porous material is represented by a unit cell which is assumed to be repeated throughout the medium. Based on the orientation of the fibers in the space, fibrous media are divided into three categories: 1D, 2D, and 3D structures. Paralle...