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Articoli di riviste sul tema "Two phase flow"

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Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 21 settembre 2024

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1

Nysanov, E. A., Zh S. Kemelbekova, O. M. Ibragimov, A. E. Kozhabekova e М. Оsman. "CALCULATION OF TWO-SPEED FLOW OF TWO-PHASE OPEN FLOW". NEWS of National Academy of Sciences of the Republic of Kazakhstan 6, n. 444 (15 dicembre 2020): 203–12. http://dx.doi.org/10.32014/2020.2518-170x.148.

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In this article the mathematical model of unsteady flow the two-phase open stream taking into account the redistribution of the particulate concentration, the depth of flow and water filtration on the bottom of the channel, and also created an efficient method of calculation. In this case, the two-speed flow is considered, i.e. the presence of the longitudinal and vertical components of the phase velocities is taken into account, and we also believe that the flow parameters along the flow do not change. Initial and boundary conditions are established based on theoretical and empirical formulas, which are widely used in practice. The flow in open channels is non-pressurized, occurs under the influence of gravity and is characterized by the fact that the flow has a free surface. At the initial moment of time, we consider the flow to be uniform in the longitudinal direction and all parameters are set by known theoretical and empirical formulas. At the bottom of the channel for longitudinal velocity component of the water use condition of adhesion, and for the longitudinal velocity component of solid phase condition for the shift and believe the known concentrations of solid particles, and vertical components of velocity the phases of the filtering conditions (for water), and hydraulic size (for solid particles). On the free surface, we consider that there are no solid particles, and for the longitudinal components of the phase velocities we neglect the force of air friction, and for the vertical components of the phase velocities we use the condition of non-uniformity of the free surface in time. On the basis of the developed mathematical model and the created method of calculation, the changes of the main parameters in the depth of the flow and in time are determined.

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2

TEZUKA, Akira, e Junichi Matsumoto. "Two-phase Flow Business?" Proceedings of the Fluids engineering conference 2005 (2005): 354. http://dx.doi.org/10.1299/jsmefed.2005.354.

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3

Spedding, P. L., G. S. Woods, R. S. Raghunathan e J. K. Watterson. "Vertical Two-Phase Flow". Chemical Engineering Research and Design 76, n. 5 (luglio 1998): 620–27. http://dx.doi.org/10.1205/026387698525144.

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4

Spedding, P. L., G. S. Woods, R. S. Raghunathan e J. K. Watterson. "Vertical Two-Phase Flow". Chemical Engineering Research and Design 76, n. 5 (luglio 1998): 628–34. http://dx.doi.org/10.1205/026387698525153.

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5

Spedding, P. L., G. S. Woods, R. S. Raghunathan e J. K. Watterson. "Vertical Two-Phase Flow". Chemical Engineering Research and Design 76, n. 5 (luglio 1998): 612–19. http://dx.doi.org/10.1205/026387698525298.

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6

Brand, B., R. Emmerling, Ch Fischer, H. P. Gaul e K. Umminger. "Two-phase flow instrumentation". Nuclear Engineering and Design 145, n. 1-2 (novembre 1993): 113–30. http://dx.doi.org/10.1016/0029-5493(93)90062-e.

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7

Woods, G. S., P. L. Spedding, J. K. Watterson e R. S. Raghunathan. "Vertical Two Phase Flow". Developments in Chemical Engineering and Mineral Processing 7, n. 1-2 (15 maggio 2008): 7–16. http://dx.doi.org/10.1002/apj.5500070103.

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8

Elias, E., e G. S. Lellouche. "Two-phase critical flow". International Journal of Multiphase Flow 20 (agosto 1994): 91–168. http://dx.doi.org/10.1016/0301-9322(94)90071-x.

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9

Naung, Khine Tun, Hayato TAJIMA e Hideaki MONJI. "315 Analytical Study on Supersonic Two-Phase Flow Nozzle". Proceedings of Ibaraki District Conference 2012.20 (2012): 85–86. http://dx.doi.org/10.1299/jsmeibaraki.2012.20.85.

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10

Ode, Kosuke, Toshihiro Ohmae, Kenji Yoshida e Isao Kataoka. "STUDY OF FLOW STRUCTURE IN THE AERATION TANK INDUCED BY TWO PHASE JET FLOW(Multiphase Flow)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 229–34. http://dx.doi.org/10.1299/jsmeicjwsf.2005.229.

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11

Petrovic, Milan, e Vladimir Stevanovic. "Two-component two-phase critical flow". FME Transaction 44, n. 2 (2016): 109–14. http://dx.doi.org/10.5937/fmet1602109p.

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12

Aghaee, Mohammad, Rouhollah Ganjiazad, Ramin Roshandel e Mohammad Ali Ashjari. "Two-phase flow separation in axial free vortex flow". Journal of Computational Multiphase Flows 9, n. 3 (24 luglio 2017): 105–13. http://dx.doi.org/10.1177/1757482x17699411.

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Abstract (sommario):

Multi-phase flows, particularly two-phase flows, are widely used in the industries, hence in order to predict flow regime, pressure drop, heat transfer, and phase change, two-phase flows should be studied more precisely. In the petroleum industry, separation of phases such as water from petroleum is done using rotational flow and vortices; thus, the evolution of the vortex in two-phase flow should be considered. One method of separation requires the flow to enter a long tube in a free vortex. Investigating this requires sufficient knowledge of free vortex flow in a tube. The present study examined the evolution of tube-constrained two-phase free vortex using computational fluid dynamics. The discretized equations were solved using the SIMPLE method. It was determined that as the liquid flows down the length of the pipe, the free vortex evolves into combined forced and free vortices. The tangential velocity of the free and forced vortices also decreases in response to viscosity. It is shown that the concentration of the second discrete phase (oil) is greatest at the center of the pipe in the core of the vortex. This concentration is at a maximum at the outlet of the pipe.

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13

Triplett, K. A., S. M. Ghiaasiaan, S. I. Abdel-Khalik e D. L. Sadowski. "Gas–liquid two-phase flow in microchannels Part I: two-phase flow patterns". International Journal of Multiphase Flow 25, n. 3 (aprile 1999): 377–94. http://dx.doi.org/10.1016/s0301-9322(98)00054-8.

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14

Turza, J., Z. Tkáč e M. Gullerová. "Geometric displacement volume and flow in the phase of a two-phase hydraulic converter". Research in Agricultural Engineering 53, No. 2 (7 gennaio 2008): 54–66. http://dx.doi.org/10.17221/2122-rae.

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The paper researches the possibilities to replace the parallel flow hydraulic mechanisms in agricultural machinery with hydraulic units with fluid alternating flow as they provide more efficient operation due to their output alternating motion. The method being presented analyses how the geometric displacement volume in the fluid alternating piston converter is created. This is basically achieved by adding or omitting elements in the phase which consequently reduces the quantity of converter types being manufactured.

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15

Frankum, D. P., V. V. Wadekar e B. J. Azzopardi. "Two-phase flow patterns for evaporating flow". Experimental Thermal and Fluid Science 15, n. 3 (ottobre 1997): 183–92. http://dx.doi.org/10.1016/s0894-1777(97)00020-4.

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16

Oddie, Gary, e J. R. Anthony Pearson. "FLOW-RATE MEASUREMENT IN TWO-PHASE FLOW". Annual Review of Fluid Mechanics 36, n. 1 (gennaio 2004): 149–72. http://dx.doi.org/10.1146/annurev.fluid.36.050802.121935.

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17

Seeger, M. "Coriolis flow measurement in two phase flow". Computing and Control Engineering 16, n. 3 (1 giugno 2005): 10–16. http://dx.doi.org/10.1049/cce:20050301.

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18

Chen, S. S. "Flow-Induced Vibrations in Two-Phase Flow". Journal of Pressure Vessel Technology 113, n. 2 (1 maggio 1991): 234–41. http://dx.doi.org/10.1115/1.2928751.

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Two-phase flow exists in many shell-and-tube heat exchangers and power generation components. The flowing fluid is a source of energy that can induce small-amplitude subcritical oscillations and large-amplitude dynamic instabilities. In fact, many practical system components have experienced excessive flow-induced vibrations. This paper reviews the current understanding of vibration of circular cylinders in quiescent fluid, cross-flow, and axial flow, with emphasis on excitation mechanisms, mathematical models, and available experimental data. A unified theory is presented for cylinders oscillating under different flow conditions.

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19

McQuillan, K. W., e P. B. Whalley. "Flow patterns in vertical two-phase flow". International Journal of Multiphase Flow 11, n. 2 (marzo 1985): 161–75. http://dx.doi.org/10.1016/0301-9322(85)90043-6.

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20

Kichatov, B. V., e I. V. Boyko. "Two-Phase Flow with Phase Transitions Instability". Heat Transfer Research 28, n. 4-6 (1997): 273–76. http://dx.doi.org/10.1615/heattransres.v28.i4-6.80.

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21

PROSPERETTI, A., e D. Z. ZHANG. "DISPERSE PHASE STRESS IN TWO-PHASE FLOW". Chemical Engineering Communications 141-142, n. 1 (gennaio 1996): 387–98. http://dx.doi.org/10.1080/00986449608936425.

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22

Chen, Fuzhen, Haorui Li, Yang Gao e Hong Yan. "Two-particle method for liquid–solid two-phase mixed flow". Physics of Fluids 35, n. 3 (marzo 2023): 033317. http://dx.doi.org/10.1063/5.0140599.

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Liquid–solid two-phase flows are a very important class of multiphase flow problems widely existing in industry and nature. This paper establishes a two-phase model for liquid–solid two-phase flows considering multiphase states of granular media. The volume fraction is defined by the solid phase, determining the material properties of the two phases, and momentum is exchanged between the phases by drag and pressure gradient forces. On this basis, a two-particle method for simulating the liquid–solid two-phase flow is proposed by coupling smoothed particle hydrodynamics with smoothed discrete particle hydrodynamics. The coupling framework for the two-particle method is constructed, and the coupling between the algorithms is realized through interphase momentum exchange, volume fraction constraint, and field variable sharing. The liquid phase density changes are divided into two types. One is caused by weak compressibility, and the other is caused by changes in the solid phase volume fraction. The former is used to calculate the liquid-phase flow field, and the latter is used to calculate the two-phase coupling to solve the problem of sudden bulk density changes in the liquid phase caused by changes in particle volume fractions. The two-particle method maintains the dual advantages of the particle method for free interface tracking and material point tracking for particles. The new method is validated using a series of fundamental test cases, and comparison with experimental results shows that the new method is suitable for resolving liquid–solid two-phase flow problems and has significant practical value for future simulations of mudflow motions, coastal breakwaters, and landslide surges.

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23

HARAGUCHI, Naoki, e Hiroyasu OHTAKE. "ICONE19-43620 Study on Pressure Loss of Liquid Single-Phase Flow and Two Phase Flow in Micro- and Mini-Channels". Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_250.

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24

Whalley, P. B., e Geoffrey F. Hewitt. "VERTICAL ANNULAR TWO PHASE FLOW". Multiphase Science and Technology 4, n. 1-4 (1989): 103–81. http://dx.doi.org/10.1615/multscientechn.v4.i1-4.20.

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25

Li, Jinghai, e Mooson Kwauk. "Particle-fluid two-phase flow". China Particuology 1, n. 1 (aprile 2003): 42. http://dx.doi.org/10.1016/s1672-2515(07)60100-6.

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26

Serizawa, Akimi, Ziping Feng e Zensaku Kawara. "Two-phase flow in microchannels". Experimental Thermal and Fluid Science 26, n. 6-7 (agosto 2002): 703–14. http://dx.doi.org/10.1016/s0894-1777(02)00175-9.

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27

Hemeida, Adel, e Faisal Sumait. "Two-Phase Flow in Flowlines". Journal of King Saud University - Engineering Sciences 1, n. 1-2 (1989): 259–71. http://dx.doi.org/10.1016/s1018-3639(18)30873-0.

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28

Chen, J. J. J. "Two-phase gas-liquid flow". Chemical Engineering Science 40, n. 10 (1985): 1999–2000. http://dx.doi.org/10.1016/0009-2509(85)80145-7.

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29

Chen, Zhangxin, e Richard E. Ewing. "Degenerate two-phase incompressible flow". Numerische Mathematik 90, n. 2 (1 dicembre 2001): 215–40. http://dx.doi.org/10.1007/s002110100291.

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30

Filippov, Yu P., e K. S. Panferov. "Two-phase cryogenic flow meters". Cryogenics 51, n. 11-12 (novembre 2011): 640–45. http://dx.doi.org/10.1016/j.cryogenics.2011.09.013.

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31

Filippov, Yu P., e K. S. Panferov. "Two-phase cryogenic flow meters". Cryogenics 51, n. 11-12 (novembre 2011): 635–39. http://dx.doi.org/10.1016/j.cryogenics.2011.09.014.

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32

Chen, Zhangxin. "Degenerate Two-Phase Incompressible Flow". Journal of Differential Equations 171, n. 2 (aprile 2001): 203–32. http://dx.doi.org/10.1006/jdeq.2000.3848.

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33

FURUYA, Masahiro, Takahiro ARAI, Taizo KANAI e Kenetsu SHIRAKAWA. "Development of Two-phase Flow Measurement Sensors and Gas-Liquid Two-phase Flow Dynamics". Journal of the Visualization Society of Japan 31, n. 122 (2011): 92–97. http://dx.doi.org/10.3154/jvs.31.92.

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34

Chen, Jie, Shuyu Sun e Zhangxin Chen. "Coupling Two-Phase Fluid Flow with Two-Phase Darcy Flow in Anisotropic Porous Media". Advances in Mechanical Engineering 6 (1 gennaio 2014): 871021. http://dx.doi.org/10.1155/2014/871021.

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Abstract (sommario):

This paper reports a numerical study of coupling two-phase fluid flow in a free fluid region with two-phase Darcy flow in a homogeneous and anisotropic porous medium region. The model consists of coupled Cahn-Hilliard and Navier-Stokes equations in the free fluid region and the two-phase Darcy law in the anisotropic porous medium region. A Robin-Robin domain decomposition method is used for the coupled Navier-Stokes and Darcy system with the generalized Beavers-Joseph-Saffman condition on the interface between the free flow and the porous media regions. Obtained results have shown the anisotropic properties effect on the velocity and pressure of the two-phase flow.

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35

Supa-Amornkul, Savalaxs, Frank R. Steward e Derek H. Lister. "Modeling Two-Phase Flow in Pipe Bends". Journal of Pressure Vessel Technology 127, n. 2 (8 dicembre 2004): 204–9. http://dx.doi.org/10.1115/1.1904063.

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In order to have a better understanding of the interaction between the two-phase steam-water coolant in the outlet feeder pipes of the primary heat transport system of some CANDU reactors and the piping material, themalhydraulic modelling is being performed with a commercial computational fluid dynamics (CFD) code—FLUENT 6.1. The modeling has attempted to describe the results of flow visualization experiments performed in a transparent feeder pipe with air-water mixtures at temperatures below 55°C. The CFD code solves two sets of transport equations—one for each phase. Both phases are first treated separately as homogeneous. Coupling is achieved through pressure and interphase exchange coefficients. A symmetric drag model is employed to describe the interaction between the phases. The geometry and flow regime of interest are a 73 deg bend in a 5.9cm diameter pipe containing water with a Reynolds number of ∼1E5-1E6. The modeling predicted single-phase pressure drop and flow accurately. For two-phase flow with an air voidage of 5–50%, the pressure drop measurements were less well predicted. Furthermore, the observation that an air-water mixture tended to flow toward the outside of the bend while a single-phase liquid layer developed at the inside of the bend was not predicted. The CFD modeling requires further development for this type of geometry with two-phase flow of high voidage.

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36

Celata, G. P., M. Cumo, F. D'Annibale e G. E. Farello. "Two-phase flow models in unbounded two-phase critical flows". Nuclear Engineering and Design 97, n. 2 (novembre 1986): 211–22. http://dx.doi.org/10.1016/0029-5493(86)90109-3.

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37

Ishii, Mamoru. "TWO-FLUID MODEL FOR TWO-PHASE FLOW". Multiphase Science and Technology 5, n. 1-4 (1990): 1–63. http://dx.doi.org/10.1615/multscientechn.v5.i1-4.10.

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38

Jin, H., J. Glimm e D. H. Sharp. "Compressible two-pressure two-phase flow models". Physics Letters A 353, n. 6 (maggio 2006): 469–74. http://dx.doi.org/10.1016/j.physleta.2005.11.087.

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39

Jin, Hyeonseong, e James Glimm. "Weakly compressible two-pressure two-phase flow". Acta Mathematica Scientia 29, n. 6 (novembre 2009): 1497–540. http://dx.doi.org/10.1016/s0252-9602(10)60001-x.

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40

Voutsinas, Alexandros, Toshihiko Shakouchi, Junichi Takamura, Koichi Tsujimoto e Toshitake Ando. "FLOW AND CONTROL OF VERTICAL UPWARD GAS-LIQUID TWO-PHASE FLOW THROUGH SUDDEN CONTRACTION PIPE(Multiphase Flow 2)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 307–12. http://dx.doi.org/10.1299/jsmeicjwsf.2005.307.

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41

UEMATSU, Junichi, Kazuya ABE, Tatsuya HAZUKU, Tomoji TAKAMASA e Takashi HIBIKI. "ICONE15-10315 EFFECT OF WALL WETTABILITY ON FLOW CHARACTERISTICS OF GAS-LIQUID TWO-PHASE FLOW". Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_159.

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42

Wong, T. N., e Y. K. Yau. "Flow patterns in two-phase air-water flow". International Communications in Heat and Mass Transfer 24, n. 1 (gennaio 1997): 111–18. http://dx.doi.org/10.1016/s0735-1933(96)00110-8.

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43

Chung, Moon-Sun, Won-Jae Lee e Kwi-Seok Ha. "CHOKED FLOW CALCULATIONS OF TWO-PHASE BUBBLY FLOW". Numerical Heat Transfer, Part A: Applications 42, n. 3 (agosto 2002): 297–305. http://dx.doi.org/10.1080/10407780290059567.

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44

Spedding, P. L., e D. R. Spence. "Flow regimes in two-phase gas-liquid flow". International Journal of Multiphase Flow 19, n. 2 (aprile 1993): 245–80. http://dx.doi.org/10.1016/0301-9322(93)90002-c.

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45

Hishida, K., M. Ichiyanagi e Y. Sato. "Phase separation techniques in two-phase microchannel flow". Journal of Physics: Conference Series 147 (1 febbraio 2009): 012056. http://dx.doi.org/10.1088/1742-6596/147/1/012056.

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46

Lund, Halvor, e Peder Aursand. "Two-Phase Flow of CO2 with Phase Transfer". Energy Procedia 23 (2012): 246–55. http://dx.doi.org/10.1016/j.egypro.2012.06.034.

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47

Mori, Michitsugu, Pravin Sawant, Yang Liu e Mamoru Ishii. "ICONE19-43772 DROPLET DEPOSITION RATE IN VERTICAL ANNULAR TWO-PHASE FLOW". Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_300.

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48

Vasenin, I. M. "INVESTIGATION OF TWO PHASE FLOW MOTION WITH SMALL-SIZE GAS BUBBLES". Eurasian Physical Technical Journal 16, n. 2 (25 dicembre 2019): 48–54. http://dx.doi.org/10.31489/2019no2/48-54.

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49

Chang, J. S., P. C. Looy e G. D. Harvel. "ICONE15-10675 EFFECT OF INLET TWO-PHASE FLOW PATTERN ON THE ANNULAR FLOW LIQUID SEPARATION PHENOMENA". Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_364.

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50

Hérard, J. M., e H. Mathis. "A three-phase flow model with two miscible phases". ESAIM: Mathematical Modelling and Numerical Analysis 53, n. 4 (luglio 2019): 1373–89. http://dx.doi.org/10.1051/m2an/2019028.

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Abstract (sommario):

The paper concerns the modelling of a compressible mixture of a liquid, its vapor and a gas. The gas and the vapor are miscible while the liquid is immiscible with the gaseous phases. This assumption leads to non symmetric constraints on the void fractions. We derive a three-phase three-pressure model endowed with an entropic structure. We show that interfacial pressures are uniquely defined and propose entropy-consistent closure laws for the source terms. Naturally one exhibits that the mechanical relaxation complies with Dalton’s law on the phasic pressures. Then the hyperbolicity and the eigenstructure of the homogeneous model are investigated and we prove that it admits a symmetric form leading to a local existence result. We also derive a barotropic variant which possesses similar properties.

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