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    Wyświetlanie 1-8 z 8
    Tytuł:
    The onset of thermal convection in couple-stress fluid in hydromagnetics saturating a porous medium
    Autorzy:
    Rana, G. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/201216.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    couple stress fluid
    magnetic field
    porous medium
    thermal convection
    Opis:
    In this paper, the effect of magnetic field on thermal convection in couple-stress fluid saturating a porous medium is considered. By applying linear stability theory and the normal mode analysis method, a mathematical theorem is derived which states that the viscoelastic thermal convection at marginal state, cannot manifest as stationary convection if the thermal Rayleigh number R, the medium permeability parameter Pι the couple-stress parameter F and the Chandrasekher number Q, satisfy the inequality R ≤4π2/Pl (1 + 2π2F + PlQ/2ε) the result clearly establishes the stabilizing character of couple-stress parameter and magnetic field whereas destabilizing character of medium permeability.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 357-362
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed convective flow of unsteady hydromagnetic couple stress fluid through a vertical channel filled with porous medium
    Autorzy:
    Makhalemele, C. R.
    Rundora, L.
    Adesanya, S. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839697.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja mieszana
    magnetohydrodynamika
    przepływ oscylacyjny
    couple stress fluid
    mixed convection
    magnetohydrodynamics
    oscillatory flow
    Opis:
    In this paper, the mixed convective flow of an electrically conducting, viscous incompressible couple stress fluid through a vertical channel filled with a saturated porous medium has been investigated. The fluid is assumed to be driven by both buoyancy force and oscillatory pressure gradient parallel to the channel plates. A uniform magnetic field of strength 0B is imposed transverse to the channel boundaries. The temperature of the right channel plate is assumed to vary periodically, and the temperature difference between the plates is high enough to induce radiative heat transfer. Under these assumptions, the equations governing the two-dimensional couple stress fluid flow are formulated and exact solutions of the velocity and the temperature fields are obtained. The effects of radiation, Hall current, porous medium permeability and other various flow parameters on the flow and heat transfer are presented graphically and discussed extensively.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 148-161
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of stenosis and dilatation on flow of blood mixed with suspended nanoparticles: a study using homotopy technique
    Autorzy:
    Sudha, T.
    Umadevi, C.
    Dhange, M.
    Manna, S.
    Misra, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839885.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ krwi
    zwężenie tętnicy
    ciśnienie krwi
    stenosis
    dilatation
    couple stress fluid
    impedance
    shear stress
    Opis:
    The paper deals with a theoretical study on blood flow in a stenosed segment of an artery, when blood is mixed with nano-particles. Blood is treated here as a couple stress fluid. Stenosis is known to impede blood flow and to be the cause of different cardiac diseases. Since the arterial wall is weakened due to arterial stenosis, it may lead to dilatation /aneurysm. The homotopy perturbation technique is employed to determine the solution to the problem for the case of mild stenosis. Analytical expressions for velocity, shear stress at the wall, pressure drop, and flow resistance are derived. The impact of different physical constants on the wall shear stress and impedance of the fluid is examined by numerical simulation. Streamline patterns of the nanofluid are investigated for different situations.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 251-265
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical study of couple stress fluid through a sphere with an influence of the magnetic field
    Autorzy:
    Krishna Prasad, Madasu
    Sarkar, Priya
    Powiązania:
    https://bibliotekanauki.pl/articles/2202037.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    creeping flow
    sphere
    magnetic effect
    couple stress fluid
    drag
    przepływ pełzający
    kula
    efekt magnetyczny
    Opis:
    The present work concerns to study of the steady, axisymmetric slow flow of couple stress fluid through a rigid sphere in the transverse magnetic field. Boundary conditions on the sphere surface are the zero couple stress condition and tangential slip condition. The stream function, vorticity vector, and pressure term are obtained. The drag acting on the sphere in the presence of MHD is calculated. Here, we graphically represented the Hartmann number, couple stress, and slip parameters effect on the drag coefficient. Some well-known results of the drag are deduced.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 3; 99--110
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slow flow of couple stress fluid past a cylinder embedded in a porous medium: slip effect
    Autorzy:
    Sarkar, Priya
    Madasu, Krishna Prasad
    Powiązania:
    https://bibliotekanauki.pl/articles/38911649.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    couple stress fluid
    cylinder
    Brinkman’s equation
    saturated porous medium
    slip coefficients
    drag force
    Opis:
    An analytical study for the creeping flow of a couple stress fluid past a cylinder embedded in a porous medium is presented using the slip condition. The uniform flow is considered far away from a cylinder. The boundary conditions used are zero couple stress and tangential slip conditions. The modified Bessel functions represent the stream function (the velocity). The drag exerted on a solid cylinder immersed in a porous medium is derived. The impacts of the couple stress, permeability, and slip parameters on the normalized drag force are presented graphically. The drag forces of well-known exceptional cases are reduced. The drag force is a decreasing function of the permeability and couple stress parameters and an increasing function of the slip parameter.
    Źródło:
    Engineering Transactions; 2023, 71, 4; 537-551
    0867-888X
    Pojawia się w:
    Engineering Transactions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Couple stress fluid past a sphere embedded in a porous medium
    Autorzy:
    Madasu, Krishna Prasad
    Sarkar, Priya
    Powiązania:
    https://bibliotekanauki.pl/articles/2065761.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sphere
    couple stress fluid
    saturated porous medium
    Brinkman’s equation
    drag force
    kula
    równanie Brinkmana
    siła tarcia
    Opis:
    This paper concerns the analytical investigation of the axisymmetric and steady flow of incompressible couple stress fluid through a rigid sphere embedded in a porous medium. In the porous region, the flow field is governed by Brinkman’s equation. Here we consider uniform flow at a distance from the sphere. The boundary conditions applied on the surface of the sphere are the slip condition and zero couple stress. Analytical solution of the problem in the terms of stream function is presented by modified Bessel functions. The drag experienced by an incompressible couple stress fluid on the sphere within the porous medium is calculated. The effects of the slip parameter, the couple stress parameter, and permeability on the drag are represented graphically. Special cases of viscous flow through a sphere are obtained and the results are compared with earlier published results.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 1; 5--19
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport of MHD couple stress fluid through peristalsis in a porous medium under the influence of heat transfer and slip effects
    Autorzy:
    Sankad, G. C.
    Nagathan, P. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/266102.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    peristaltic flow
    couple stress fluid
    Darcy number
    slip parameter
    compliant walls
    przepływ perystaltyczny
    liczba Darcy'ego
    parametr poślizgu
    Opis:
    An attempt has been made to examine the effects of magnetohydrodynamic couple stress fluid in peristaltic flow with porous medium under the impact of slip, heat transfer and wall properties. The expressions are obtained for temperature, coefficient of heat transfer and velocity. Influences of different parameters, the Hartmann number, Brinkman number and adaptability parameters on the temperature and warmth trade coefficient are discussed through outlines.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 403-414
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of applied mathematical models for describing the behaviour of aqueous humor in eye structures
    Autorzy:
    Dzierka, M.
    Jurczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/265906.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    porous medium
    Newtonian fluid
    non-Newtonian fluid
    couple stress fluid
    generalized second grade fluid
    Darcy’s rule
    aqueous humor flow
    intraocular pressure
    glaucoma
    porowatość
    płyn nienewtonowski
    jaskra
    ciśnienie wewnątrzgałkowe
    Opis:
    In the paper, currently used methods for modeling the flow of the aqueous humor through eye structures are presented. Then a computational model based on rheological models of Newtonian and non-Newtonian fluids is proposed. The proposed model may be used for modeling the flow of the aqueous humor through the trabecular meshwork. The trabecular meshwork is modeled as an array of rectilinear parallel capillary tubes. The flow of Newtonian and non-Newtonian fluids is considered. As a results of discussion mathematical equations of permeability of porous media and velocity of fluid flow through porous media have been received.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 757-772
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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