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


Wyświetlanie 1-2 z 2
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
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
    Wyświetlanie 1-2 z 2

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