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Wyszukujesz frazę "Sarafraz M., M." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Mathematical modeling of air duct heater using the finite difference method
    Autorzy:
    Sarafraz M., M.
    Peyghambarzadeh S., M.
    Marahel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/779839.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nagrzewnica kanałowa
    modelowanie
    zmienne właściwości fizyczne
    różnice skończone
    logarytm średniej temperatury
    duct heater
    modeling
    variable physical properties
    finite differences
    log mean temperature difference
    Opis:
    In this research, mathematical modeling of a duct heater has been performed using energy conservation law, Stefan-Boltzman law in thermal radiation, Fourier’s law in conduction heat transfer, and Newton’s law of cooling in convection heat transfer. The duct was divided to some elements with equal length. Each element has been studied separately and air physical properties in each element have been used based on its temperature. The derived equations have been solved using the finite difference method and consequently air temperature, internal and external temperatures of the wall, internal and external convection heat transfer coeffi cients, and the quantity of heat transferred have been calculated in each element and effects of the variation of heat transfer parameters have been surveyed. The results of modelling presented in this paper can be used for the design and optimization of heat exchangers.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 4; 47-52
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of the pool boiling heat transfer coefficient using the gas injection into the water
    Autorzy:
    Sarafraz, M.M.
    Peyghambarzadeh, S.M.
    Alavi Fazel, S.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778947.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    heat transfer
    pool boiling
    Gas-liquid solution
    Nucleation site density
    SO2
    water
    Opis:
    In this paper, a new method for enhancing the pool boiling heat transfer coefficient of pure liquid, based on the gas injection through the liquids has been introduced. Hence, the effect of gas dissolved in a stagnant liquid on pool boiling heat transfer coefficient, nucleation site density, and bubble departure diameter has experimentally been investigated for different mole fractions of SO2 and various heat fluxes up to 114 kW/ m2. The presence of SO2 in captured vapor inside the bubbles, particularly around the heat transfer surface increases the pool boiling heat transfer coefficient. The available predicted correlations are unable to obtain the reasonable values for pool boiling heat transfer coefficient in this particular case. Therefore, to predict the pool boiling heat transfer coefficient accurately, a new modified correlation based on Stephan-Körner relation has been proposed. Also, during the experiments, it is found that nucleation site density is a strictly exponential function of heat flux. Accordingly, a new correlation has been obtained to predict the nucleation site density. The major application of the nucleation site density is in the estimating of mean bubble diameters as well as local agitation due to the rate of bubble frequency.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 4; 100-109
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cooling of High Heat Flux Flat Surface with Nanofluid Assisted Convective Loop. Experimental Assessment
    Autorzy:
    Arya, A.
    Shahmiry, S.
    Nikkhah, V.
    Sarafraz, M.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/139852.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ZnO nanoparticle
    pressure drop
    heat transfer coefficient
    friction factor
    nanocząstki ZnO
    spadek ciśnienia
    współczynnik przenikania ciepła
    współczynnik tarcia
    Opis:
    Experimental investigation was conducted on the thermal performance and pressure drop of a convective cooling loop working with ZnO aqueous nanofluids. The loop was used to cool a flat heater connected to an AC autotransformer. Influence of different operating parameters, such as fluid flow rate and mass concentration of nanofluid on surface temperature of heater, pressure drop, friction factor and overall heat transfer coefficient was investigated and briefly discussed. Results of this study showed that, despite a penalty for pressure drop, ZnO/water nanofluid was a promising coolant for cooling the micro-electronic devices and chipsets. It was also found that there is an optimum for concentration of nanofluid so that the heat transfer coefficient is maximum, which was wt. % = 0.3 for ZnO/water used in this research. In addition, presence of nanoparticles enhanced the friction factor and pressure drop as well; however, it is not very significant in comparison with those of registered for the base fluid.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 4; 519-531
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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