Browse by Subject "two-phase flow"

  • Fei, P.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-01)
    This research is focused on the experimental analysis and numerical simulation of adiabatic developing two-phase refrigerant flow in manifolds including the inlet tube after the expansion device. The two-phase flow ...

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  • Talpaert, Arthur (2013-05-24)
    The scope of this Master Thesis is the two-fluid model. This study aims at analysing their ill-posedness, showing how it is related to non-hyperbolicity and giving a measurement that I call the numerical hyperbolicity. ...

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  • Burr, J.D.; Newell, T.A.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-06)
    Multi-port microchannel tubes are increasingly popular for use in a variety of heat transfer applications, primarily for automotive condensers and radiators, but also in a variety of refrigeration and air conditioning ...

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  • Tuo, Hanfei (2014-01-16)
    This work presents an experimental and numerical study of flash gas bypass (FGB) method as a way to solve the existing problem of distribution of two phase adiabatic flow in headers of parallel flow evaporators, of typically ...

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  • Yashar, D.A.; Wilson, M.J.; Kopke, H.R.; Graham, D.M.; Chato, J.C.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-08)
    A series of evaporation and condensation experiments have been performed on horizontal microfin tubes with refrigerants R134a and R410A. Mass flux varied from 75 kg/m2-s to 700 kglm2 -s and average test section quality ...

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  • Hendrick, M.J.; Jassim, E.W.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-12)
    The purpose of this investigation is to develop models for transient slug flow under refrigeration system startup conditions. Slug flow is generated for two-phase air-water and R134a with pressure differences of 69-520 kPa; ...

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  • Graham, D.M.; Kopke, H.R.; Wilson, M.J.; Yashar, D.A.; Chato, J.C.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-01)
    Refrigerants R134a and R410A have been used for void fraction measurements in smooth horizontal tubes with diameters between 4mm and 7mm. Quality and mass flux were varied from 5% to 90% and 75 kglm2-s to 700 kglm2-s, ...

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  • Winkler, C.M.; Vanka, S.P.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-10)
    In the current dissertation work, the preferential concentration and deposition of heavy solid particles in a downward, fully developed turbulent square duct flow are studied using large eddy simulations. A second-order ...

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  • Jassim, E.W.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-07)
    Probabilistic two-phase flow map pressure drop and void fraction models are developed for 6-port microchannels in order to provide a more accurate and common means of predicting void fraction and pressure drop. The models ...

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  • Wilson, M.J. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-05)
    The purpose of this study was to observe refrigerant behavior in flattened copper tubes. A round, smooth tube with an internal diameter of 8.91 mm is taken as the base case. This tube is then successively flattened to ...

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  • Field, B.S.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-09)
    As microchannel heat exchangers have become more sophisticated in their design, more exact understanding of the flow inside them is necessary. A decrease in diameter enhances the heat transfer (which takes place at the ...

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