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    Wyświetlanie 1-3 z 3
    Tytuł:
    Heat transfer by natural convection from a heated square inner cylinder to its elliptical outer enclosure utilizing nanofluids
    Autorzy:
    Bouras, Abdelkrim
    Taloub, Djedid
    Driss, Zied
    Debka, Siham
    Powiązania:
    https://bibliotekanauki.pl/articles/2174195.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja naturalna
    nanociecz
    ułamek objętościowy
    natural convection
    Rayleigh number
    nanofluid
    volume fraction
    square elliptical
    Opis:
    In this paper a numerical study of natural convection of stationary laminar heat transfers in a horizontal ring between a heated square inner cylinder and a cold elliptical outer cylinder is presented. A Cu-water nanofluid flows through this annular space. Different values of the Rayleigh number and volume fraction of nanoparticles are studied. The system of equations governing the problem was solved numerically by the fluent calculation code based on the finite volume method and on the Boussinesq approximation. The interior and exterior surfaces are kept at constant temperature. The study is carried out for Rayleigh numbers ranging from 310 to 510. We have studied the effects of different Rayleigh numbers and volume fraction of nanoparticles on natural convection. The results are presented as isotherms, isocurrents, and local and mean Nusselt numbers. The aim of this study is to study the influence of the thermal Rayleigh number and volume fraction of nanoparticles on the heat transfer rate.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 22--34
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Rayleigh number on internal eccentricity in a heated horizontal elliptical cylinder to its coaxial square enclosure
    Autorzy:
    Bouras, Abdelkrim
    Taloub, Djedid
    Driss, Zied
    Powiązania:
    https://bibliotekanauki.pl/articles/1839785.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja naturalna
    płyn Newtona
    liczba Rayleigha
    natural convection
    newtonian fluid
    geometry ratio
    Rayleigh number
    elliptical cylinder
    Opis:
    This paper deals with numerical investigation of a natural convective flow in a horizontal annular space between a heated square inner cylinder and a cold elliptical outer cylinder with a Newtonian fluid. Uniform temperatures are imposed along walls of the enclosure. The governing equations of the problem were solved numerically by the commercial code Fluent, based on the finite volume method and the Boussinesq approximation. The effects of Geometry Ratio GR and Rayleigh numbers on fluid flow and heat transfer performance are investigated. The Rayleigh number is varied from 103 to 106. Throughout the study the relevant results are presented in terms of isotherms, and streamlines. From the results, we found that the increase in the Geometry Ratio B leads to an increase of the heat transfer coefficient. The heat transfer rate in the annulus is translated in terms of the average Nusselt numbers along the enclosure's sides. Tecplot 7 program was used to plot the curves which cleared these relations and isotherms and streamlines which illustrate the behavior of air through the channel and its variation with other parameters. The results for the streamlines, isotherms, local and average Nusselt numbers average Nusselt numbers are compared with previous works and show good agreement.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 17-29
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of aspect ratio of enclosure on free convection from horizontal cylinders in Bingham plastic fluids
    Autorzy:
    Baranwal, Ashok Kumar
    Gupta, Anoop Kumar
    Tiwari, Anurag Kumar
    Melnik, Roderick
    Powiązania:
    https://bibliotekanauki.pl/articles/2173430.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bingham plastic fluids
    aspect ratio
    Rayleigh number
    Nusselt number
    natural convection
    płyn plastikowy Bingham
    współczynnik proporcji
    liczba Rayleigha
    liczba Nusselta
    naturalna konwekcja
    Opis:
    Heat transfer in steady free convection from differentially heated cylinders enclosed in a rectangular duct filled with Bingham plastic fluids has been solved numerically for the ranges of the dimensionless groups as, Rayleigh number, 102 Ra 106; Prandtl number, 10 Pr 100 and, Bingham number, 0 Bn 50 for aspect ratios AR = 05, 0.6, 0.7, 0.8, 0.9 and 2. The streamlines, isotherm contours, yield surfaces, local and average Nusselt numbers were analysed and discussed. It is found that as the aspect ratio of the enclosure increases from 0.5 to 0.9, the average Nusselt number on the surface of the hot cylinder increases as a larger amount of fluid takes part in convection. Moreover, at sufficiently large Bingham numbers, yield stress forces dominate over buoyancy causing the flow to cease and thus the Nusselt number approaches its conduction limit. Finally, the Nusselt number approaches its conduction limit once the maximum Bingham number is reached.
    Źródło:
    Chemical and Process Engineering; 2022, 43, 2; 271--277
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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