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    Wyświetlanie 1-8 z 8
    Tytuł:
    Darcy’s and Forchheimer’s laws in practice. Part 1. The experiment
    Autorzy:
    Sobieski, W.
    Trykozko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/297795.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    Darcy’s law
    Forchheimer's law
    Forchheimer Plot Method
    porous media
    permeability
    Opis:
    The aim of this study is to derive flow parameters, which are permeability and Forchheimer coefficient, based on experimentally measured flow rates and pressure drops. When flow rates used in measurements exceed the limits of linear Darcy’s flow regime we discuss what needs to be taken into account while processing the measurements. The study consists of two parts. In this part we briefly recall Darcy’s and Forchheimer’s laws and address the issue of detecting transition between ranges of their applicability. Then we describe the experiment and discuss 8 different ways to process measurement data, four for Darcy’s, and four for Forchheimer’s models. The main topic of the second part is to provide recommendations for the best ways to process data, so that the results obtained with numerical models are in the best agreement with the experimental data. The results shown in the two papers belong to a larger work devoted to modeling fluid flows through porous media, with a special interest in granular beds.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(4); 321-335
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heuristic derivation of Brinkmans seepage equation
    Autorzy:
    Wojnar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/297997.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    porosity
    Darcy’s law
    Stokes’ equation
    successive iterations
    Born’s approximation
    Opis:
    Brinkman’s law is describing the seepage of viscous fluid through a porous medium and is more acurate than the classical Darcy’s law. Namely, Brinkman’s law permits to conform the flow through a porous medium to the free Stokes’ flow. However, Brinkman’s law, similarly as Schro¨dinger’s equation was only devined. Fluid in its motion through a porous solid is interacting at every point with the walls of pores, but the interactions of the fluid particles inside pores are different than the interactions at the walls, and are described by Stokes’ equation. Here, we arrive at Brinkman’s law from Stokes’ flow equation making use of successive iterations, in type of Born’s approximation method, and using Darcy’s law as a zero-th approximation.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(4); 359-374
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Darcy’s and Forchheimer’s laws in practice. Part 2. The numerical model
    Autorzy:
    Sobieski, W.
    Trykozko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/297860.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    Darcy’s law
    Forchheimer's law
    Forchheimer Plot Method
    porous media
    permeability
    Opis:
    Our study is based on a column experiment of water flow through a porous granular bed. In Part 1 we propose eight methods to derive parameters of flow models based on measurement data. These parameters are permeability and Forchheimer coefficient for Darcy’s and Forchheimer’s laws. The approach presented in this part uses two numerical models to perform simulations of flow. One model is based on the Finite Element Method implemented in the authors’ code. The second model, which is ANSYS/Fluent package, uses the Finite Volume Method. Results of numerical computations are compared with experimental data that allows determination of the best method of parameter evaluation (in which the error was less than 3% over the whole range of filtration velocities). The problem of identification of ranges of applicability of the Darcy’s and Forchheimer’s laws is also addressed. In the conclusions, a set of guidelines is given, which should facilitate planning a similar experiment and its computational processing.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(4); 337-350
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetohydrodynamic effect on axisymmetric Stokes flow past a weakly permeable spheroid with a solid core
    Autorzy:
    Prasad, M. K.
    Bucha, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/38627950.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    spheroid
    MHD effect
    modified Stokes law
    modified Darcy’s law
    BJSJ condition
    drag
    Opis:
    The current research is focused on the creeping motion of fluid past a permeable spheroidal particle that has an impermeable core under the magnetic forces. Motion in the permeable zone is proposed to be regulated by Darcy’s law. At the fluid-porous interface, the continuity of the normal velocity component is assumed together with the balance of pressure with normal stresses and the Beavers–Joseph–Saffman–Jones (BJSJ) slip boundary condition. Vanishing of the normal component of velocity is used at the surface of the impermeable core. The drag on the spheroidal particle is obtained in an analytical form. The reliability of the drag coefficient on significant physical parameters such as permeability, non-sphericity parameter, Hartmann numbers, separation parameter (the measure of closeness between the porous particle and the core), and slip parameters is examined. Comparisons of results are made with the cases having no magnetic effect and show that the applied magnetic field possesses the ability to reduce the rate of flow of fluid. Well-known previously published results are deduced from the current analysis.
    Źródło:
    Archives of Mechanics; 2021, 73, 5-6; 599-633
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O potrzebie uwzględniania zasysania w praktycznych zagadnieniach filtracji wody podziemnej
    On the need of consideration of suction in practical problems of groundwater filtration
    Autorzy:
    Hauryłkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075852.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    przepływ wody gruntowej
    ssanie
    ujemny potencjał przepływu
    Prawo Darcy
    groundwater flow
    suction
    negative flow potential
    Darcy’s law
    Opis:
    Seven examples of issues have been pointed out, when one should take into account the suction exerting on groundwater by capillary attraction from fine sands or similar other fine soils.
    Źródło:
    Przegląd Geologiczny; 2018, 66, 8; 481--482
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stimulation of unconventional hydrocarbon reservoirs
    Autorzy:
    Szabo, D.
    Pinka, J.
    Stolićny, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/299289.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Tight gas sand
    shale gas
    coal bed seam unconventional
    intensification
    fracturing
    propant
    mesh
    Darcy’s law
    Opis:
    In the "new age" oil and gas industry came more and more into focus term of unconventional hydrocarbons. Gained experience and success in the United States tight gas sand reservoirs Piceance, Anadarko, Greater Green, Lobo fields confirmed the hidden potential of unconventional hydrocarbon resources. In some production and development areas called coal bed seam, shale gas and tight sand reservoirs without intensifying operations isn't possible to produce commercial gas volumes. Used practises and gained large experiences in the crude oil fields are commonly used in the shale and tight gas fields across the United States. Application of these technologies of stimulation methods like fracturing in Europe is at the very beginning. Pioneer investors are waiting in all Europe for the well testing results from the first dozen fractured shale gas and tight sand reservoirs. Test results could have significant influence on the future planned massive drilling campaign of exploration of the unconventional hydrocarbon resources
    Źródło:
    AGH Drilling, Oil, Gas; 2014, 31, 2; 307-313
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slow flow past a weakly permeable spheroidal particle in a hypothetical cell
    Autorzy:
    Bucha, Tina
    Madasu, Krishna Prasad
    Powiązania:
    https://bibliotekanauki.pl/articles/1845038.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    permeable spheroid
    cell model
    Stokes law
    Darcy’s law
    BJSJ condition
    sferoida przepuszczalna
    model komórki
    prawo Stokesa
    prawo Darcy'ego
    warunek BJSJ
    Opis:
    The perspective of the current analysis is to represent the incompressible viscous flow past a low permeable spheroid contained in a fictitious spheroidal cell. Stokes approximation and Darcy’s equation are adopted to govern the flow in the fluid and permeable zone, respectively. Happel’s and Kuwabara’s cell models are employed as the boundary conditions at the cell surface. At the fluid porous interface, we suppose the conditions of conservation of mass, balancing of pressure component at the permeable area with the normal stresses in the liquid area, and the slip condition, known as Beavers-Joseph-Saffman-Jones condition to be well suitable. A closed-form analytical expression for hydrodynamic drag on the bounded spheroidal particle is determined and therefore, mobility of the particle is also calculated, for both the case of a prolate as well as an oblate spheroid. Several graphs and tables are plotted to observe the dependence of normalized mobility on pertinent parameters including permeability, deformation, the volume fraction of the particle, slip parameter, and the aspect ratio. Significant results that influence the impact of the above parameters in the problem have been pointed out. Our work is validated by referring to previous results available in literature as reduction cases.
    Źródło:
    Archive of Mechanical Engineering; 2021, LXVIII, 2; 119-146
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laminar flow past the bottom with obstacles - a porous medium approximation
    Autorzy:
    Bielski, Włodzimierz
    Wojnar, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/2104770.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    plants
    permeability
    gravity-driven flow
    Darcy-Brinkman’s law
    Stokes equation
    Opis:
    We provide a model of a stationary laminar flow in a channel at the bottom of which plants grow in a dense layer. Since this layer of plants is dense, we treat it as a porous medium and we propose to describe the flow in such a medium by Brinkman’s equation. The flow in the fluid layer located above (infiltrated by water) the layers of plants is described by the Stokes equation. We show that such a model gives results consistent with experimental observations. We indicate also that this new model complements the previously given model in which the benthonic plants were considered as a suspension, so the previous model referred to the channel at the bottom of which the plants grew rare. For high permeability of the porous medium, we arrive at the results obtained for the medium filled with a liquid with a suspension.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 509--520
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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