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    Tytuł:
    Behaviour of a non-newtonian fluid in a helical tube under the influence of thermal buoyancy
    Autorzy:
    Ramla, Mohamed
    Laidoudi, Houssem
    Bouzit, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2105993.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    helical heat exchanger
    mixed convection
    forced convection
    power-law fluids
    Nusselt number
    Opis:
    This work is an evaluative study of heat transfer in the helical-type heat exchanger. The fluid used is non-Newtonian in nature and is defined by Oswald’s model. The work was performed numerically by solving each of the Navier–Stokes equations and the energy equation using the package ANSYS-CFX. Following are the aspects that have been dealt with in this paper: the effects of thermal buoyan-cy, fluid nature and the tube shape on the heat transfer, and the fluid comportment. The interpretation of the obtained results was done by analyzing the isotherms and the streamlines. The mean values of the Nusselt number were also obtained in terms of the studied parame-ters. The results of this research enabled us to arrive at the following conclusion: the intensity of thermal buoyancy and the nature of the fluid affect the heat transfer distribution but keep the overall rate of heat transfer the same.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 2; 111--118
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MHD forced convection using ferrofluid over a backward facing step containing a finned cylinder
    Autorzy:
    Toumi, Meriem
    Bouzit, Mohamed
    Bouzit, Fayçal
    Mokhefi, Abderrahim
    Powiązania:
    https://bibliotekanauki.pl/articles/2106228.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    fin positions
    forced convection
    nanoparticles
    heat transfer
    finned cylinder
    magnetohydrodynamic
    backward facing step
    Opis:
    In this paper, a numerical study of forced convection on a backward facing step containing a single-finned fixed cylinder has been performed, using a ferrofluid and external magnetic field with different inclinations. The partial differential equations, which determine the conservation equations for mass, momentum and energy, were solved using the finite element scheme based on Galerkin’s method. The analysis of heat transfer characteristics by forced convection was made by taking different values of the Reynolds number (Re between 10 and 100), Hartmann number (Ha between 0 and 100), nanoparticles concentration (φ between 0 and 0.1) and magnetic field inclination (γ between 0° and 90°); also, several fin positions α [0°–180°] were taken in the counter clockwise direction by a step of 5. After analysing the results, we concluded that Hartmann number, nanoparticles concentration, Reynolds number and magnetic field angles have an influence on the heat transfer rate. However, the fin position on the cylinder has a big impact on the Nusselt number and therefore on heat transfer quality. The best position of the fin is at (α = 150°), which gives the best Nusselt number and therefore the best heat trans-fer, but the fin position at (α = 0°) remains an unfavourable case that gives the lowest Nusselt values.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 1; 70--81
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A qualitative study of mixing a fluid inside a mechanical mixer with the effect of thermal buoyancy
    Autorzy:
    Hassouni, Souad
    Laidoudi, Houssem
    Makinde, Oluwole Daniel
    Bouzit, Mohamed
    Boumediene, Haddou
    Powiązania:
    https://bibliotekanauki.pl/articles/2204073.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical agitation
    mixing process
    heat transfer
    thermal buoyancy
    power number
    Opis:
    This paper is concerned with the rotational motion of the impeller and the thermal buoyancy within a mechanical mixer. The task was investigated numerically using the ANSYS-CFX simulator. The programmer is based on the finite volume method to solve the differential equations of fluid motion and heat transfer. The impeller has hot surfaces while the vessel has cold walls. The rotational movement of the impeller was controlled by the Reynolds number, while the intensity of the thermal buoyancy effect was controlled by the Richardson number. The equations were solved for a steady flow. After analyzing the results of this research, we were able to conclude that there is no effect of the values of Richardson number on the power number. Also, with the presence of the thermal buoyancy effect, the quality of the fluid mixing becomes more important. The increasing Richardson number increases the value of the Nusselt number of the impeller.
    Źródło:
    Archives of Thermodynamics; 2023, 44, 1; 105--119
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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