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Wyszukujesz frazę "Variable thermal conductivity" wg kryterium: Temat

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effect of heat transfer on thermal stresses in an annular hyperbolic fin: an approximate analytical solution
    Autorzy:
    Mallick, A.
    Ranjan, R.
    Sarkar, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/279437.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermal stresses
    Adomian decomposition method (ADM)
    variable thermal conductivity
    Opis:
    An approximate analytical solution is presented for thermal stresses in an annular convectiveconductive fin of a hyperbolic profile with temperature dependent thermal conductivity. The classical thermo-elasticity theory coupled with the ADM based polynomial form of temperature field is employed for an approximate analytical solution of thermal stresses. The influence of thermal parameters, i.e. variable thermal conductivity, the thermo-geometric parameter and the non-dimensional coefficient of thermal expansion on temperature and sttress fields are investigated. The results for the stress field obtained from the ADM based solution are compared with those available in literature and found to be in close agreement.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 437-448
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal assessment of a convective porous moving fins of different material properties using Laplace-variational iterative method
    Autorzy:
    Sobamowo, M. G.
    Kamiyo, O. M.
    Salami, M. O.
    Yinusa, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030678.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Exact Method
    Laplace-variational iterative method
    Thermal response
    Variable thermal conductivity
    variational iterative method
    Opis:
    Investigation on thermal responses of different materials subjected to variant environmental condition has been a subject of ever-increasing research interest for decades. As such, research studies have shown different materials exhibiting peculiar characteristics of commercially used heat enhancement devices. Therefore, this work presents an investigation on thermal behaviour of a convective porous moving fins with temperature dependent thermal conductivity for five different materials. These materials include copper, Aluminium, Silicon nitride, Silicon carbide and Stainless steel. A hybrid method, viz- Laplace-variational iterative method (LVIM) is used to solve the model equation developed. And a perfect agreement is achieved when the result obtained from LVIM is verified with the exact solution. The result obtained shows that silicon carbide compete favourably with copper as the most efficient material in heat enhancement, while stainless steel shows the least performance. It is hoped that this work will serve as a template and a helpful tool for both scientist and engineers’ in future design of fins.
    Źródło:
    World Scientific News; 2020, 139, 2; 135-154
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable thermal conductivity in micropolar thermoelastic medium without energy dissipation possessing cubic symmetry
    Autorzy:
    Ailawalia, Praveen
    Priyanka
    Powiązania:
    https://bibliotekanauki.pl/articles/27312393.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    transfer ciepła
    mikrorotacja
    temperatura
    variable thermal conductivity
    microrotation
    temperature distribution
    normal mode analysis
    Opis:
    This investigation deals with the effect of variable thermal conductivity in a micropolar thermoelastic medium without energy dissipation with cubic symmetry. The normal mode technique is employed for obtaining components of physical quantities such as displacement, stress, temperature distribution and microrotation.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2023, 28, 1; 1--10
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bidirectionally stretched flow of Jeffrey liquid with nanoparticles, Rosseland radiation and variable thermal conductivity
    Autorzy:
    Archana, M.
    Gireesha, B. J.
    Rashidi, M. M.
    Prasannakumara, B. C.
    Gorla, R. S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/240409.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat mass transfer
    jeffrey nanofluid
    variable thermal conductivity
    rosseland approximation
    suction
    ciepło
    masa
    zmienna przewodność cieplna
    aproksymacja
    ssanie
    Opis:
    Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 4; 33--57
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed convective flow with variable viscosity and variable thermal conductivity in a channel in the presence of first order chemical reaction with heat generation or absorption
    Autorzy:
    Shobha, K. C.
    Biradar, Mahadev
    Mallikarjun B, Patil
    Powiązania:
    https://bibliotekanauki.pl/articles/1839861.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    mixed convection
    variable viscosity
    variable thermal conductivity
    first order chemical reaction
    heat generation/absorption
    konwekcja mieszana
    zmienna lepkość
    zmienna przewodność cieplna
    wytwarzanie ciepła
    absorpcja ciepła
    Opis:
    A study has been made on the flow and heat transfer of a viscous fluid in a vertical channel with first order chemical reaction and heat generation or absorption assuming that the viscosity and thermal conductivity are dependent on the fluid temperature. The temperature of the walls is maintained constant. Under these assumptions, the governing balance equations of mass, momentum and energy are formulated. The dimensionless forms of the governing equations are coupled and non-linear, which cannot be solved analytically and therefore require the use of the Runge-Kutta fourth order along with shooting technique. Graphs for velocity and temperature under different values of parameters involved are plotted and discussed. The skin friction and Nusselt number on the channel walls are also computed and discussed. Furthermore, the investigation found that variable viscosity and variable thermal conductivity enhance the velocity and temperature of the flow.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 1; 91-102
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelastic Interactions in a Rotating Infinite Orthotropic Elastic Body with a Cylindrical Hole and Variable Thermal Conductivity
    Autorzy:
    Mashat, D. S.
    Zenkour, A. M.
    Abouelregal, A. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/139602.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelasticity
    phase lags
    rotation
    orthotropic body
    cylindrical hole
    variable thermal conductivity
    termoelastyczność
    opóźnienia fazowe
    obrót
    ciało ortotropowe
    otwór cylindryczny
    zmienna przewodność cieplna
    Opis:
    In the present article, we introduced a new model of the equations of generalized thermoelasticity for unbounded orthotropic body containing a cylindrical cavity. We applied this model in the context of generalized thermoelasticity with phase-lags under the effect of rotation. In this case, the thermal conductivity of the material is considered to be variable. In addition, the cylinder surface is traction free and subjected to a uniform unit step temperature. Using the Laplace transform technique, the distributions of the temperature, displacement, radial stress and hoop stress are determined. A detailed analysis of the effects of rotation, phase-lags and the variability thermal conductivity parameters on the studied fields is discussed. Numerical results for the studied fields are illustrated graphically in the presence and absence of rotation.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 4; 481-498
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of variable fluid properties and mixed convection on biomagnetic fluid flow and heat transfer over a stretching sheet in the presence of magnetic dipole
    Autorzy:
    Murtaza, M. G.
    Alam, Jahangir
    Tzirtzilakis, E. E.
    Shamshuddin, Md.
    Ferdows, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41191498.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Warszawska, Instytut Techniki Cieplnej
    Tematy:
    stretching sheet
    biomagnetic fluid
    magnetohydrodynamic
    ferrohydrodynamic
    magnetic dipole
    magnetization
    variable viscosity
    thermal conductivity
    rozciąganie arkusza
    płyn biomagnetyczny
    magnetohydrodynamika
    ferrohydrodynamika
    dipol magnetyczny
    namagnesowanie
    zmienna lepkość
    przewodność cieplna
    Opis:
    This investigations covers the numerical analysis of a steady biomagnetic fluid flow (BFD) that passed through a two dimensional stretching sheet under the influence of magnetic dipole. The effect of fluid variable viscosity and thermal conductivity are also taken into consideration as assumed to vary as linear function of temperature. Our model mathematically formulated for BFD namely blood which consist of principles of magnetohydrodynamic (MHD) and ferrohydrodynamic (FHD), where blood treated as an electrically conducting fluid as well as polarization. Using similarity transformations, the governing system of partial differential equations are transferred into system of ordinary differential equations (ODE). The resulting coupled non linear ODE is numerically solved by employing bvp4c function technique available in MATLAB software. The effects of pertinent parameters namely ferromagnetic interaction parameter, magnetic field parameter, mixed convection parameter, viscosity variation parameter, Prandtl number, thermal conductivity parameter etc are plotted and discussed adequately for velocity and temperature profile as well as skin friction coefficient and rate of heat transfer. The results revels that velocity profile decreases as enhanced values of ferromagnetic number whereas temperature profile increased. Also found that skin friction coefficient reduces and rate of heat transfer increases by increasing values of thermal conductivity parameter and viscosity variation parameter. For numerical validation a comparisons has been made for some specific values with previous investigators. We hope that the present analysis will present in bio-medical and bio-engineering sciences.
    Źródło:
    Journal of Power Technologies; 2023, 103, 4; 193-208
    1425-1353
    Pojawia się w:
    Journal of Power Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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