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Wyświetlanie 1-10 z 107
Tytuł:
Theoretical study of nematic to isotropic transition in porous media
Autorzy:
Govind, A.
Banerjee, Kumarii
Powiązania:
https://bibliotekanauki.pl/articles/1075553.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
61.30.Cz
64.70.M-
61.30.Pq
Opis:
Experimental observations show that the N-I transition temperature (T_{NI}) for liquid crystals embedded in solid porous materials is lower compared to that of the bulk liquid crystals and T_{NI} is reduced linearly with the inverse pore diameter. To explain this, various theoretical studies have been proposed. We propose to use the mean field approach. We modify the Maier-Saupe mean field theory to include the disordering effects of porosity as a disordering surface potential. A molecule near the surface is assumed to feel the mean field potential (the Maier-Saupe type) and also the surface induced potential. We calculate the values of the nematic order parameter and hence find the T_{NI} for different pore diameters. The weighted average of the order parameter is calculated considering the cylindrical symmetry of the pores. Our calculations on the variation of T_{NI} with pore diameter agree with experimental data. Also, the calculated values of specific heat peak decrease with decrease in pore radius, in agreement with experimental trends.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 748-750
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Simulation of One-Dimensional Two-Phase Flow in Porous Media
Autorzy:
Szymkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/241426.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
two-phase flow
porous media
numerical methods
Opis:
The flow of two immiscible fluids in porous media is described by two coupled non-linear partial differential equations of the parabolic type. In this paper a numerical algorithm to simulate one-dimensional two-phase flow is presented. Cell-centered finite volume method and a generalized two-level scheme with weighting parameter are applied for the discretization in space and time, respectively. The performance of the algorithm is tested for different values of the weighting parameter in the time-discretization scheme and for various methods of approximation of the average conductivities between two adjacent gridblocks. The results are compared with an analytical solution for the horizontal flow and with a reference numerical solution performed on a dense grid for the vertical flow.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 2; 117-136
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of MHD on unsteady oscillatory Couette flow through porous media
Autorzy:
Sharma, Bhupendra K.
Sharma, Pawan Kumar
Cauhan, Sudhir Kumar
Powiązania:
https://bibliotekanauki.pl/articles/2174184.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
materiały porowate
przepływ Couette'a
MHD
porous media
free convection
Couette flow
Opis:
This paper describes the effects of a magnetic field on unsteady free convection oscillatory systems. When temperature and species concentration fluctuate with time around a non-zero constant, "Couette flow" across a porous medium occurs. The system of non-linear ODEs that governs the flow is solved analytically using the perturbation approach because the amplitude of fluctuations is very tiny. Mean flow and transient velocity, transient concentration, transient temperature, heat transfer, mean skin friction and phase and amplitude of skin friction. All have approximate solutions. The influence of different parameters on flow characteristics has been specified and discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 188--202
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport of emulsions in granular porous media driven by capillary force
Autorzy:
Shtyka, O.
Przybysz, Ł.
Sęk, J.
Powiązania:
https://bibliotekanauki.pl/articles/105872.pdf
Data publikacji:
2018
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
emulsion
imbibition
kinetics
granular media
pore radius
emulsja
nasiąkanie
kinetyka
ośrodek ziarnisty
promień porów
Opis:
The transport of liquids driven by capillary suction-pressure and balanced by both viscous drag force and gravity acceleration is known as spontaneous imbibition. The prediction of spontaneous imbibition in porous media is of importance due to its relevance as a fundamental phenomenon in numerous industrial technologies as well as in nature. A vast majority of the experimental results and mathematical models concerning the imbibition process of single-phase liquids are considered and analyzed in the literature. The present research focuses on two-phase liquids transport in porous medium driven by capillary force. The penetrating liquids were surfactant-stabilized emulsions with the different dispersed phase concentrations. The discussed issues are the influence of porous bed composition and inner phase concentration on the height of an emulsion penetration, which allows to predict the velocity of imbibition process. From a practical point of view, the experimental results give the possibility to evaluate: productivity of granular sorbents applied to recover the environment, efficiency of building materials wetting with multiphase liquids, process of oil-derived pollutants migration in porous media, e.g. soil and other rock structures, etc.
Źródło:
Acta Innovations; 2018, 26; 38-44
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Study on Gas Flow through a Micro-Nano Porous Media
Autorzy:
Abbasbandy, S.
Powiązania:
https://bibliotekanauki.pl/articles/1489816.pdf
Data publikacji:
2012-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Bf
68.47.-b
87.10.Ed
95.90.+v
Opis:
The present research examines the unsteady isothermal flow of a gas through a semi-infinite micro-nano porous medium, a nonlinear boundary value problem on semi-infinite interval. This problem is solved by two different methods and compare their results with solution of other methods is compared. Also through the convergence of these methods, the accurate initial slope y(x) with good capturing the essential behavior of y(x) is obtained.
Źródło:
Acta Physica Polonica A; 2012, 121, 3; 581-585
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of mass-transfer process in porous media with complex shape : [abstract]
Autorzy:
Ualyiev, Z.
Kaltayev, A.
Bekbauov, B.
Powiązania:
https://bibliotekanauki.pl/articles/300046.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ośrodek porowaty
porous medium
Opis:
Some rare minerals and metals are extracted by underground leaching. Thus sorption extraction of minerals on mass-transfer devices with use ion-exchange resin is the most widespread method of productive solutions processing. Now wide application finds sorbing device which represents the cylindrical column, filled by a layer of ion-exchange resin in the form of spherical porous granules. Through a column from below upwards with the filtration velocity the solution containing sorbing a mineral is pumped over. Velocity of solution admission is calculated off on kinetic parameters. A cone barrier located before a submitting pipe is intended for achievement of uniform distribution of a solution across a column [fig.]. On an output from a column through certain time tests of a solution which are analyzed on the maintenance in them of mineral are selected. Sorption proceeds until concentration of mineral on an outlet from a column will not be equal some admissible value. After that the saturated layer of a sorbent being below by a mineral is unloaded. Sorbing device from above is supplemented with a fresh sorbent and process repeats. There are some questions, a degree of an involvement of a sorbent in mass-transfer process (especially, in a transverse direction of a column) and change of column resistance depending on the size and forms of cone barrier, influence of dispersive and kinetic characteristics on thickness of the saturated layer.
Źródło:
Wiertnictwo, Nafta, Gaz; 2007, 24, 1; 57-58
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przepływ w szczelinach anizotropowego ośrodka porowatego
Flow in anizotropic fractured porous media
Autorzy:
Kazieko, H.
Kazieko, L.
Powiązania:
https://bibliotekanauki.pl/articles/886452.pdf
Data publikacji:
2005
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
osrodki porowate
osrodki anizotropowe
anizotropowy osrodek porowaty
szczeliny
przeplywy
obliczenia
Źródło:
Scientific Review Engineering and Environmental Sciences; 2005, 14, 1[31]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory investigations of diclofenac migration in saturated porous media - a case study
Autorzy:
Okońska, Monika
Marciniak, Marek
Zembrzuska, Joanna
Kaczmarek, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/94508.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
non-steroidal anti-inflammatory drugs
column tests
parameter estimation
optimisation method
MATLAB
niesteroidowe leki przeciwzapalne
test kolumnowy
identyfikacja parametrów
metody optymalizacji
Opis:
At present, concentrations of pharmaceuticals in surface and ground waters are low; however, even low concentrations of certain substances may prove very harmful. One of such pharmaceutical drugs is diclofenac, a popular non-steroidal anti-inflammatory drug (NSAID). For this reason, it is important to determine its mobility in groundwater and to estimate parameters of migration. Authors conducted column tests for two porous media: an artificial one, consisting of glass granules, and a natural one, i.e., sandur sand obtained from a site north of the city of Poznań (Poland). During the test, impulse breakthrough curves of chloride ions and diclofenac were recorded. The results were used to identify a specific sorption model and to determine values of migration parameters. Solutions of the inverse problem using optimisation methods and of equations of mathematical migration models were carried out in a MATLAB environment. Based on test results, the mobility of diclofenac is shown to be very high and comparable to that of chloride ions. The tests also revealed a slight and irreversible sorption of diclofenac on grains of both porous media.
Źródło:
Geologos; 2019, 25, 3; 213-223
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unstructured finite-volume meshes for two-dimensional flow in variably saturated porous media
Autorzy:
Burzyński, K.
Szymkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1934018.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska
Tematy:
finite volume method
Richards' equation
unsaturated flow
unstructured mesh
Opis:
This paper presents a numerical algorithm for solving the equation describing variably saturated flow in porous media. The algorithm is based on a control volume finite element approach and can be applied to two-dimensional unstructured meshes consisting of triangular elements. Two methods of defining the dual control volume grid are discussed. We also demonstrate that the method of calculating the average permeability at the control volume face significantly influences numerical results.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 3-4; 339-352
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 107

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