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2012 | 14 | 4 | 100-109
Tytuł artykułu

Enhancement of the pool boiling heat transfer coefficient using the gas injection into the water

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
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.
Wydawca
Rocznik
Tom
14
Numer
4
Strony
100-109
Opis fizyczny
Daty
wydano
2012-12-01
online
2013-01-12
Twórcy
  • Islamic Azad University, Department of Chemical Engineering, Mahshahr Branch, Mahshahr, Iran
  • Islamic Azad University, Department of Chemical Engineering, Mahshahr Branch, Mahshahr, Iran
Bibliografia
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  • 7. Stephan, K. & Körner, M. (1969), Berechnung des Wärme- übergangs Verdampfender Binärer Flussigkeitgemische., ChmieIng Techn., 41, 409-417. (doi not found).
  • 8. Unal, H.C (1986), Prediction of nucleate pool boiling heat transfer coefficients for binary mixtures, Int. J. of Heat Mass Trans., 29, 637-640. Doi: 10.1016/0017-9310(86)90096-7.[Crossref]
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  • 11. Alavi Fazel, S.A., Jamialahmadi M. & Safekordi, A. (2008), Experimental investigation in pool boiling heat transfer of pure/binary mixtures and heat transfer correlations., Iranian J. chemistry and Chem. Eng., 27, (3), 135-150.
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  • 18. Alavi Fazel, A.S., Jamialahmadi, M. & Safekordi, A.A.(2009). Pool Boiling Heat Transfer in Dilute Water/ Triethyleneglycol Solutions, Chinese J. Chem. Eng., 17(4) Doi: 10.1016/S1004-9541(08)60244-X.[Crossref]
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  • 32. 14.TDC-Thermodynamics Data Center, the Institute of Coal Chemistry (Gliwice) and the Institute of Physical Chemistry and property (Warsaw) of the Polish Academy of Sciences, Poland.
  • 33. Sarafraz, M.M., Peyghambarzadeh, S.M., Alavifazel, S.A. (2012), Enhancement of nucleate pool boiling heat transfer to dilute binary mixtures using endothermic chemical reactions around the smoothed horizontal cylinder (48) 10 1755-1765, DOI: 10.1007/s00231-012-1019-5.[Crossref][WoS]
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  • 35. Sarafraz, M.M. & Peyghambarzadeh, S.M. (2012). Influence of thermodynamic models on the prediction of pool boiling heat transfer coefficient of dilute binary mixtures, 39, 1303-1310. http://dx.doi.org/10.1016/j.icheatmasstransfer.2012.06.020.[Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_v10026-012-0110-5
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