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    Wyświetlanie 1-6 z 6
    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:
    The effect of rheology with gas bubbles on linear elastic waves in fluid-saturated granular media
    Autorzy:
    ALI, A. A.
    Strunin, D. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/265018.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    reologia
    materiały porowate
    pęcherzyki
    Frenkel-Biots waves
    bubbles
    rheology
    porous media
    Opis:
    Elastic waves in fluid-saturated granular media depend on the grain rheology, which can be complicated by the presence of gas bubbles. We investigated the effect of the bubble dynamics and their role in rheological scheme, on the linear Frenkel-Biot waves of P1 type. For the wave with the bubbles the scheme consists of three segments representing the solid continuum, fluid continuum and bubbles surrounded by the fluid. We derived the Nikolaevskiy-type equation describing the velocity of the solid matrix in the moving reference system. The equation is linearized to yield the decay rate λ as a function of the wave number k. We compared the λ (k) -dependence for the cases with and without the bubbles, using typical values of the input mechanical parameters. For both the cases, the λ(k) curve lies entirely below zero, which implies a global decay of the wave. We found that the increase of the radius of the bubbles leads to a faster decay, while the increase in the number of the bubbles leads to slower decay of the wave.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 575-594
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of the magnetic field on the Rayleigh-Taylor instability in a couple-stress fluid
    Autorzy:
    Chavaraddi, K. B.
    Awati, V. B.
    Nandeppanavar, M. M.
    Gouder, P. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264667.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole magnetyczne
    materiały porowate
    szybkość wzrostu
    RTI
    couple-stress fluid
    magnetic field
    porous media
    growth rate
    Opis:
    In this study we examine the effect of the magnetic field parameter on the growth rate of the Rayleigh-Taylor instability (RTI) in a couple stress fluids. A simple theory based on fully developed flow approximations is used to derive the dispersion relation for the growth rate of the RTI. The general dispersion relation obtained using perturbation equations with appropriate boundary conditions will be reduced for the special cases of propagation and the condition of instability and stability will be obtained. In solving the problem of the R-T instability the appropriate boundary conditions will be applied. The couple-stress parameter is found to be stabilizing and the influence of the various parameters involved in the problem on the interface stability is thoroughly analyzed. The new results will be obtained by plotting the curves between the dimensionless growth rate and the dimensionless wave number for various physical parameters involved in the problem (viz. the magnetic field, couple-stress, porosity, etc.) in the problem. It is found that the magnetic field and couple-stress have a stabilization effect whereas the buoyancy force (surface tension) has a destabilization effect on the RT instability in the presence of porous media.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 611-622
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MHD free convection-radiation interaction in a porous medium - part II: soret/dufour effects
    Autorzy:
    Vasu, B.
    Gorla, Rama Subba Reddy
    Murthy, P. V. S. N.
    Prasad, V. R.
    Beg, O. A.
    Siddiqa, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/266156.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    materiały porowate
    pole magnetyczne
    magnetohydrodynamika
    non-Darcy porous media transport
    magnetic field
    horizontal circular cylinder
    Soret number
    Dufour number
    Opis:
    This paper is focused on the study of two dimensional steady magnetohydrodynamics heat and mass transfer by laminar free convection from a radiative horizontal circular cylinder in a non-Darcy porous medium by taking into account of the Soret/Dufour effects. The boundary layer equations, which are parabolic in nature, are normalized into non-similar form and then solved numerically with the well-tested, efficient, implicit, stable Keller–Box finite-difference scheme. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the local skin friction, Nusselt number and Sherwood number for several values of the parameters, namely the buoyancy ratio parameter, Prandtl number, Forchheimer number, magnetohydrodynamic body force parameter, Soret and Dufour numbers. The dependency of the thermophysical properties has been discussed on the parameters and shown graphically. Increasing the Forchheimer inertial drag parameter reduces velocity but elevates temperature and concentration. Increasing the Soret number and simultaneously reducing the Dufour number greatly boosts the local heat transfer rate at the cylinder surface. A comparative study of the previously published and present results in a limiting sense is made and an excellent agreement is found between the results.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 157-175
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of viscous dissipation and thermal radiation on heat transfer over a non-linearly stretching sheet through porous medium
    Autorzy:
    Nandeppanavar, M. M.
    Siddalingappa, M. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/264505.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    materiały porowate
    metoda Runge-Kutty
    promieniowanie cieplne
    porous media
    viscous dissipation
    Runge-Kutta method
    thermal radiation
    wall temperature gradient
    wall temperature
    Opis:
    In this present paper, we have discussed the effects of viscous dissipation and thermal radiation on heat transfer over a non-linear stretching sheet through a porous medium. Usual similarity transformations are considered to convert the non-linear partial differential equation of motion and heat transfer into ODE’s. Solutions of motion and heat transfer are obtained by the Runge-Kutta integration scheme with most efficient shooting technique. The graphical results are presented to interpret various physical parameters of interest. It is found that the velocity profile decreases with an increase of the porous parameter asymptotically. The temperature field decreases with an increase in the parametric values of the Prandtl number and thermal radiation while with an increase in parameters of the Eckert number and porous parameter, the temperature field increases in both PST (power law surface temperature) and PHF (power law heat flux) cases. The numerical values of the non-dimensional wall temperature gradient and wall temperature are tabulated and discussed.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 461-474
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Empirical investigation of two designs of incline solar water desalination system
    Autorzy:
    Agboola, P. O.
    Egelioglu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/778289.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    metoda ISWD
    dysze natryskowe
    sprawność
    woda pitna
    materiały porowate
    knot
    Incline solar water desalination system
    spray jets
    efficiency
    potable water
    porous media
    wick
    Opis:
    This paper presents an experimental investigation of two incline solar water desalination (ISWD) systems. One design uses spray jets for spraying water onto the absorber plate, while the other uses a longitudinal slot for getting the inlet water on the absorber plate. The first ever ISWD system constructed and tested by Aybar et al (2005) used the longitudinal slot with a maximum daily production of 2.995 kg/m2 day. The Aybar et al design produced 3.4 kg/m2-day while the new design produced 6.41 kg/m2-day for wick on absorber plate system day during the hottest months in Famagusta (July-August 2010). Also tested was the influence of porous media (wire mesh), wick on the absorber plate. The effect of number of spray jets used in the system on the daily productivity and efficiency of the systems were also investigated.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 1; 35-40
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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