the ultrasonic velocity, density and viscosity of some schiff bases of 4-amino benzoic acid  were measured in 1,4-dioxane and dimethylformamide at 308.15 k. various acoustical properties such as isentropic compressibility (ks), rao’s molar sound function (rm), the van der waals constant (b), molar compressibility (w), inter molecular free length (lf), relaxation strength (r), internal pressure ...

based on the carnahan and starling hard sphere equation of compressibility, an equation of state has been derived. conditions that must be met by all equations of state are applied in order to obtain attractive term or non - ideal compressibility term of the equation. second virial coefficient and acentric factor arc used in the derivation of the equation of state. in this equation, compressibi...

The large amount of nanoscale pores in shale results in the inability to apply Darcy's law. Moreover, the gas adsorption of shale increases the complexity of pore size characterization and thus decreases the accuracy of flow regime estimation. In this study, an apparent permeability model, which describes the adsorptive gas flow behavior in shale by considering the effects of gas adsorption, st...

To investigate the static characteristics of aerostatic journal bearings with porous bushing, flow model—in which compressibility lubricating gas is considered—is established based on Reynolds lubrication equation, Darcy equation for material, and continuity equation. With finite difference method, schemes non-uniform grids, relaxation virtual node numerical method governing equations compressi...

The coefficient of isothermal compressibility (oil compressibility) is defined as the fractional change of oil volume per unit change in pressure. Though the oil compressibility so defined frequently appears in the partial-differential equations describing fluid flow in porous media, it is rarely used in this form in practical engineering calculations. Instead, oil compressibility is usually as...

The accuracy of the relationship between formation pressure and water saturation has a direct impact on predicting production performance coal reservoirs. As result, researchers are becoming more interested in this connection. most commonly used method to evaluate connection is semianalytic method, but it disregards matrix shrinkage pore compressibility, resulting inaccurate estimations for A m...

The method of multi-particle collision dynamics (MPCD) and its different implementations are commonly used in the field soft matter physics to simulate fluid flow at micron scale. Typically, coarse-grained particles described by equation state an ideal gas, is rather compressible. This contrast conventional fluids, which incompressible for velocities much below speed sound, can cause inhomogene...