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Showing 1 to 20 of 36 for “"Darcy's law"”.
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Experimental determination of the flow parameters involved in moisture migration through fiberglass insulation materials
… performance of wetted insulation materials. Darcy's Law was found to apply for the regime of flow encountered in which liquid water flows under the force of its own weight in horizontal rooftop insulation. Experimental determination of the constant of proportionality in Darcy's Law, the …
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On relative permeability : a new approach to two-phase fluid flow in porous media
Being valid for single-phase flow, Darcy's law is adapted to two-phase flow through the standard approach of relative permeability, in which permeability, rather than being a unique property of the porous medium, becomes a joint property of the porous medium and each fluid phase. The goal of this …
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A Preliminary Study to Assess Model Uncertainties in Fluid Flows
… models for a Pressurized Water Reactor, and Darcy's law vs full momentum equation for High Temperature Gas Reactor. Euler equations with friction forces and a momentum and energy source/sink are used. The geometric model consists of a one-dimensional rectangular loop system. The fluid is …
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Modeling the flow of non-Newtonian fluids in packed beds at the pore scale
… scale. Semi-empirical expressions, such as Darcy's law, are substituted for velocity in the continuity equation, which is then coupled with a momentum, mass, and energy balance. While a continuum approach is acceptable in some cases, additional modeling is required for certain non-linear …
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Optimizing performance of ceramic pot filters in Northern Ghana and modeling flow through paraboloid-shaped filters/
… flower pot shaped filters as a function of Darcy's Law, and this work continued that effort by describing flow through a paraboloid shaped filter. The geometry of the filter was determined experimentally and modeled. A model was developed based on Darcy's Law and the filter geometry which …
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ΑΣΤΑΘΗΣ ΡΟΗ ΣΕ ΚΑΡΣΤΙΚΑ ΥΔΡΟΦΟΡΑ ΣΤΡΩΜΑΤΑ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΩΝ ΠΕΠΕΡΑΣΜΕΝΩΝ ΣΤΟΙΧΕΙΩΝ
… CAN BE BEYOND THE UPPER LIMIT OF THE VALIDITY OF DARCY'S LAW. THE NONLINEAR EQUATION, WHICH GOVERNS NON-DARCIAN FLOW OF GROUNDWATER THROUGH FRACTURED MEDIA OF DOUBLE POROSITY, IS SOLVED NUMERICALLY USING FINITE ELEMENT METHOD. TWO MAIN COMPUTATIONAL SCHEMES ARE DEVELOPED TO DESCRIBE THE UNSTEADY, …
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A 3-dimensional H-adaptive algorithm for groundwater flow and contaminant transport
… based on the equations for conservation of mass, Darcy's law for an anisotropic medium, and the time-dependent species transport equations. Petrov-Galerkin weighting of the advection terms provides numerical stability. An explicit time marching scheme is used to solve the transient equations. By …
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Numerical simulation of fluid flow through porous media using the immersed boundary method
… of the packs are computed from the well-known Darcy's law in the low Reynolds number regime, and have been investigated through various geometric parameters, such as porosity, polydispersity, numeric distributions of unique diameters and aspect ratios. It is shown that the permeability can be …
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Development and verification of a resin film infusion/resin transfer molding simulation model for fabrication of advanced textile composites
… finite element/control volume technique based on Darcy's Law of flow through porous media. This technique allows for the efficient numerical calculation of the advancing resin front within the preform materials. The heat transfer in the fabric preform and tooling is analyzed using a transient …
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Compaction and Cure of Resin Film Infusion Prepregs
… fraction combining the continuity equation, Darcy's Law, and mat compressibility has been derived and solved numerically. Resin is assumed to be incompressible and inertial effects are neglected. Based on the resin content of regions where resin and fiber coexist, expressions for tracking …
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Rheological properties of candle filter deposits at elevated temperatures and pressures
… pressure conditions. The system was modeled by Darcy's law, yielding a permeability coefficient that varied as a function of porosity between 0, at an approximate porosity of 0.885, and 3.7 x 10-11 m2.;As part of an on-going project, PFBC (Pressurized Fluidized Bed Combustor) simulated filter …
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Microstructural and fluid transport properties of potatoes during frying
… by developing an engineering model using Darcy's law relation, mass balance equation and poroelasticity relations at temperatures within 25$^o$C - 80$^o$C. A finite element package (COMSOL Multiphysics ver. 5.0, Burlington, MA) was used to solve these equations to obtain the velocity …
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Hot Mix Asphalt Permeability: Tester Size Effects and Anisotropy
… represents the one dimensional assumption of Darcy's Law falling head method. The third goal was to validate the results by simulating the field permeability test with a finite element model. A number of simulations with different permeability values and anisotropic permeability ratios were …
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Dynamics of residual non-aqueous phase liquids in porous media subject to freeze-thaw
… including freezing-induced pressure model, Darcy's law model, multipore ganglia model (rupture coefficient) and ice-snap off model.
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Black Liquor Droplet Combustion and Modeling
… control volume method. The model uses the power-law scheme for combined advection diffusion, and the fully-implicit scheme for the time step. It predicts internal velocities, gas and solid temperatures (assumed equal), pressure, and composition. Pressure and velocity equations use Darcy's Law for …
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A Three-dimensional Model of Poroviscous Aquifer Deformation
… of Helm's poroviscosity as a constitutive law governing the stress-strain relation of material deformation and Gersevanov's generalization of Darcy's law for fluid flow in porous media. Relative to the classical linear poroelasticity, the proposed model provides a more realistic tool, yet …
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Changes in Oriented Strandboard Permeability During Hot-Pressing
… Superficial permeability was determined using Darcy's law and for each sample, multiple readings were made at five different pressure differentials. Permeability through the mat thickness was highly dependent on compaction ratio and to a lesser extent flake thickness. As the compaction ratio is …
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Experimental characterization of the Barree and Conway (2004) single-phase non-Darcy flow model in various hydraulic fracturing sands
… to experimentally investigate the effect of non-Darcy flow through fracturing sand and irregular shaped materials on the parameters of the Barree and Conway (2004) non-Darcy single-phase flow model. It also investigates the existence of the minimum permeability concept. Several modifications were …
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Multi-Scale Thermo-Hydro-Mechanical Behavior of Saturated Earth Materials
… soils. The formulation is performed by coupling Darcy's law for water flow in porous media with existing relations estimating thermally induced fully-drained volumetric strains. The resulting partial differential equation—the thermal consolidation theory—is solved and validated against …
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Surface Water and Groundwater Hydraulics, Exchange, and Transport During Simulated Overbank Floods Along a Third-Order Stream in Southwest Virginia
… signals propagated too fast for bulk Darcy flow through porous media. Preferential flow was particularly obvious where the pressure signal bypassed an intermediate depth but was observed at a deeper depth. Bulk Darcy flow in combination with preferential flow was suggested at locations …
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