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    Wyświetlanie 1-4 z 4
    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:
    Determination of constant parameters of copper as power-law hardening material at different test conditions
    Autorzy:
    Kowser, M. A.
    Mahiuddin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/955240.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    power-law hardening constant
    work-hardening process
    stress hardening exponent
    power-law hardening material
    heat treatment
    tensile test
    stress-strain curve
    proces utwardzania
    obróbka cieplna
    próba rozciągania
    Opis:
    In this paper a technique has been developed to determine constant parameters of copper as a power-law hardening material by tensile test approach. A work-hardening process is used to describe the increase of the stress level necessary to continue plastic deformation. A computer program is used to show the variation of the stress-strain relation for different values of stress hardening exponent, n and power-law hardening constant, α . Due to its close tolerances, excellent corrosion resistance and high material strength, in this analysis copper (Cu) has been selected as the material. As a power-law hardening material, Cu has been used to compute stress hardening exponent, n and power-law hardening constant, α from tensile test experiment without heat treatment and after heat treatment. A wealth of information about mechanical behavior of a material can be determined by conducting a simple tensile test in which a cylindrical specimen of a uniform cross-section is pulled until it ruptures or fractures into separate pieces. The original cross sectional area and gauge length are measured prior to conducting the test and the applied load and gauge deformation are continuously measured throughout the test. Based on the initial geometry of the sample, the engineering stress-strain behavior (stress-strain curve) can be easily generated from which numerous mechanical properties, such as the yield strength and elastic modulus, can be determined. A universal testing machine is utilized to apply the load in a continuously increasing (ramp) manner according to ASTM specifications. Finally, theoretical results are compared with these obtained from experiments where the nature of curves is found similar to each other. It is observed that there is a significant change of the value of n obtained with and without heat treatment it means the value of n should be determined for the heat treated condition of copper material for their applications in engineering fields.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 687-698
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady three-dimensional MHD flow due to impulsive motion with heat and mass transfer past a stretching sheet in a saturated porous medium
    Autorzy:
    Rajagopal, K.
    Veena, P. H.
    Pravin, V. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/264376.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ laminarny
    naprężenia ścinające
    wymiana ciepła
    wymiana masy
    unsteadiness
    laminar flow
    three dimensional
    shear stress
    heat and mass transfer
    short-time and long-time solution
    Opis:
    The development of velocity, temperature and concentration fields of an incompressible viscous electrically conducting fluid, caused by impulsive stretching of the surface in two lateral directions and by suddenly increasing the surface temperature from that of the surrounding fluid in a saturated porous medium is studied. The partial differential equations governing the unsteady laminar boundary layer flow are solved analytically. For some particular cases, closed form solutions are obtained, and for large values of the independent variable asymptotic solutions are found. The surface shear stress in x and y directions and the surface heat transfer and surface mass transfer increase with the magnetic parameter and with permeability parameter and the stretching ratio, and there is a smooth transition from the short-time solution to the long-time solution.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 137-151
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous effects of heat transfer and variable viscosity on peristaltic transport of casson fluid flow in an inclined porous tube
    Autorzy:
    Manjunatha, G.
    Rajashekhar, C.
    Vaidya, H.
    Prasad, K. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/266265.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    liczba Darcy'ego
    zmienna lepkość
    granica plastyczności
    Darcy number
    thermal slip
    velocity slip
    variable viscosity
    yield stress
    Opis:
    The present study investigates the combined effects of varying viscosity and heat transfer on a Casson fluid through an inclined porous axisymmetric tube in the presence of slip effects. The modeled governing equations are solved analytically by considering the long wavelength and small Reynolds number approximations. The numerical integration is employed to obtain pressure rise and frictional force. A parametric analysis has been presented to study the effects of the Darcy number, angle of inclination, varying viscosity, velocity slip, thermal slip, yield stress, amplitude ratio, Prandtl number and Eckert number on the pressure rise, pressure gradient, streamlines, frictional force and temperature. The study reveals that an increase in the angle of inclination and viscosity parameter has a proportional increase in the pressure rise. Also, an increase in the porosity causes a significant reduction in the pressure rise.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 309-328
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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