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Journal articles on the topic 'Multiphase'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 May 2024

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1

Sun, Pei Qiu, De Gui Zhu, Xiao Song Jiang, Hong Liang Sun, and Song Chen. "In Situ Synthesis of TiB₂-TiC_0.8-40vol%SiC by Hot Pressing." Advanced Materials Research 813 (September 2013): 179–87. http://dx.doi.org/10.4028/www.scientific.net/amr.813.179.

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TiB2-TiC0.8-40vol%SiC multiphase ceramics were prepared by in-situ hotpressing sintering. The phase composition and microstructures of the materials were characterized by optical mic- oscope, X-ray diffraction and scanning electron microscopy. The effects of sintering temperature on the phases, microstructures and mechanical properties of the ceramics were investigated. The results show that density, bending strength and fracture toughness of the ceramics are increased with the elevation of sintering temperature (1800-1950°C). High densified TiB2-TiC0.8-40vol%SiC multipha- se ceramics and optimized microstructure is obtained by sintering at 1900°C, in which the uniform distribution of lath-shape TiB2 and bulk TiC0.8 grains can be observed obviously. Nano-SiC particles distributed dispersively in the TiB2 and TiC0.8 grains and at boundaries. The Vickers hardness, fract- ure toughness, flexural strength and electrical conductivity of the TiB2-TiC0.8-40vol%SiC multipha- se ceramics sintered at 1900°C are 24.055GPa, 8.27±1.0MPa∙m1/2, 516.69MPa and 2.2×106S∙m-1, respectively. However, up to 1950°C, TiB2 and TiC0.8 grains gradually grew up, the bending stren- gth of multiphase ceramics was decreased greatly. In addition, TiB2, TiC0.8 and SiC particles were incorporated together to improve the particulate strength and toughness of composite material by the synergistic mechanism effects among the crystal phases in the multiphase ceramics, such as crack deflection, grain’s pull-out and fine-grain toughening.

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2

Gouda, M. G. "Multiphase stabilization." IEEE Transactions on Software Engineering 28, no. 2 (2002): 201–8. http://dx.doi.org/10.1109/32.988499.

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3

Lemonnier, H. "Multiphase instrumentation: The keystone of multidimensional multiphase flow modeling." Experimental Thermal and Fluid Science 15, no. 3 (October 1997): 154–62. http://dx.doi.org/10.1016/s0894-1777(97)00023-x.

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4

Meerakaviyad, Deepak, Tony Keville, Atma Prakash, Abdullah Sajid, and Faik Hamad. "Recent progress in multiphase flow simulation through multiphase pumps." Heat Transfer 49, no. 5 (April 25, 2020): 2849–67. http://dx.doi.org/10.1002/htj.21749.

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5

Verdolotti, Tommaso, Fabio Pilato, Simone Cottonaro, Edoardo Monelli, Carolina Giordano, Pamela Guadalupi, Massimo Benenati, et al. "ColorViz, a New and Rapid Tool for Assessing Collateral Circulation during Stroke." Brain Sciences 10, no. 11 (November 20, 2020): 882. http://dx.doi.org/10.3390/brainsci10110882.

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Prognosis of patients with acute ischemic stroke is strictly related to the patency and prominence of the collateral leptomeningeal pathways distal to the arterial occlusion. The gold standard for assessment of collateral circulation is conventional angiography, but it is invasive and used in selected cases. To date, the most reliable technique is multiphase CTA; currently, the available classifications of collateral circles are often complex, time-consuming, and require a trained observer. The purpose of our work is to establish the effectiveness of a new semi-automatic post-processing software (ColorViz FastStroke, GE Healthcare, Milwaukee, Wisconsin) in evaluation of collateral circulation compared to the six-point classifications of multiphase CTA already validated in literature. We selected 86 patients with anterior ischemic stroke symptoms who underwent multiphasic CTA in our emergency department. Two radiologists separately evaluated the collateral leptomeningeal vessels, analyzing respectively, the multiphase CTA (using the six-point scale and its trichotomized form) and ColorViz (using a three-point scale). Then the results were matched. We found a good correlation between the two different analyses; the main advantage of ColorViz is that, while maintaining fast diagnostic times, it allows a simpler and more immediate evaluation of collateral circulation, especially for less experienced radiologists.

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6

Guan, Xiang-Shan, Peng-Nan Sun, Hong-Guan Lyu, Nian-Nian Liu, Yu-Xiang Peng, Xiao-Ting Huang, and Yang Xu. "Research Progress of SPH Simulations for Complex Multiphase Flows in Ocean Engineering." Energies 15, no. 23 (November 28, 2022): 9000. http://dx.doi.org/10.3390/en15239000.

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Complex multiphase flow problems in ocean engineering have long been challenging topics. Problems such as large deformations at interfaces, multi-media interfaces, and multiple physical processes are difficult to simulate. Mesh-based algorithms could have limitations in dealing with multiphase interface capture and large interface deformations. On the contrary, the Smoothed Particle Hydrodynamics (SPH) method, as a Lagrangian meshless particle method, has some merit and flexibility in capturing multiphase interfaces and dealing with large boundary deformations. In recent years, with the improvement of SPH theory and numerical models, the SPH method has made significant advances and breakthroughs in terms of theoretical completeness and computational stability, which starts to be widely used in ocean engineering problems, including multiphase flows under atmospheric pressure, high-pressure multiphase flows, phase-change multiphase flows, granular multiphase flows and so on. In this paper, we review the progress of SPH theory and models in multiphase flow simulations, discussing the problems and challenges faced by the method, prospecting to future research works, and aiming to provide a reference for subsequent research.

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7

Abdul Karim, Kasrul, Lim Geok Yin, Nor Azizah Mohd Yusoff, Md Nazri Othman, and Auzani Jidin. "Design of Five-Phase Transformer through Finite Element Simulation." Applied Mechanics and Materials 761 (May 2015): 12–16. http://dx.doi.org/10.4028/www.scientific.net/amm.761.12.

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The interests in multiphase (more than three) system are escalating recently especially in the motor drive applications. Thus, this paper introduces the graphical phasor diagram method in designing the multiphase transformer connection. The proposed method eases the design process of the static multiphase transformer that produces multiphase output from the standard three phase input. The transformer connection was simulated in ANSYS Maxwell and the multiphase waveform with appropriate phase angle was obtained. The design of five-phase transformer using graphical phasor and simulation results from the finite elements software are presented in this paper.

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8

Denney, Dennis. "Multiphase-Flowmeter Experience." Journal of Petroleum Technology 50, no. 04 (April 1, 1998): 84–86. http://dx.doi.org/10.2118/0498-0084-jpt.

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9

Bybee, Karen. "Subsea Multiphase Pumping." Journal of Petroleum Technology 57, no. 05 (May 1, 2005): 57–60. http://dx.doi.org/10.2118/0505-0057-jpt.

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10

Pourret, Alexandre, and Georg Knebel. "Driving multiphase superconductivity." Science 373, no. 6558 (August 27, 2021): 962–63. http://dx.doi.org/10.1126/science.abj8193.

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11

Robertson, Megan L., Marc A. Hillmyer, Anne-Cécile Mortamet, and Anthony J. Ryan. "Biorenewable Multiphase Polymers." MRS Bulletin 35, no. 3 (March 2010): 194–200. http://dx.doi.org/10.1557/mrs2010.651.

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AbstractHybrid macromolecules composed of two or more covalently connected segments have the ability to self-assemble into nanostructured materials. These fascinating materials are used in applications ranging from footwear to bitumen modification to microelectronics. The number of technologies that utilize or could benefit from multiphase polymers is expanding at a rapid rate. This growth is due to the development of simple scalable synthetic technologies, a deeper understanding of their structure-property relationships, and their effectiveness as low-level additives. As industrial uses of self-assembled polymers become more prevalent, there will be a heightened focus on alternative preparative approaches that do not rely on petroleum feedstocks. Therefore the development of biorenewable multiphase polymers is an important research endeavor. In this article, we will explore the synthesis, self-assembly, and properties of renewable block and graft copolymers that contain aliphatic polyesters, as well as bio-sourced segmented polyurethanes. These two classes of multiphase polymers are the most promising and practical candidates for implementation in the next generation of sustainable materials.

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12

Gaitov, B. Kh, and Ya M. Kashin. "Multiphase welding equipment." Welding International 21, no. 7 (July 2007): 529–33. http://dx.doi.org/10.1080/09507110701510378.

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13

Romano, L., S. Levantino, C. Samori, and A. L. Lacaita. "Multiphase LC oscillators." IEEE Transactions on Circuits and Systems I: Regular Papers 53, no. 7 (July 2006): 1579–88. http://dx.doi.org/10.1109/tcsi.2006.876415.

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14

Belous, A. G., and O. V. Ovchar. "Multiphase microwave dielectrics." Materials Science-Poland 29, no. 1 (March 2011): 47–55. http://dx.doi.org/10.2478/s13536-011-0009-5.

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15

Smith, J. M. "Large Multiphase Reactors." Chemical Engineering Research and Design 84, no. 4 (April 2006): 265–71. http://dx.doi.org/10.1205/cherd05055.

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16

Walshaw, C., M. Cross, and K. McManus. "Multiphase mesh partitioning." Applied Mathematical Modelling 25, no. 2 (December 2000): 123–40. http://dx.doi.org/10.1016/s0307-904x(00)00041-x.

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17

Dudukovic, Milorad P., Faical Larachi, and Patrick L. Mills. "Multiphase reactors – revisited." Chemical Engineering Science 54, no. 13-14 (July 1999): 1975–95. http://dx.doi.org/10.1016/s0009-2509(98)00367-4.

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18

Courtney, J. M. "Multiphase biomedical material." Biomaterials 14, no. 2 (January 1993): 131. http://dx.doi.org/10.1016/0142-9612(93)90225-q.

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19

Maggi, Federico, and Fernando Alonso-Marroquin. "Multiphase capillary flows." International Journal of Multiphase Flow 42 (June 2012): 62–73. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2012.01.011.

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20

Morse, S. A. "Multiphase Rayleigh fractionation." Chemical Geology 226, no. 3-4 (February 2006): 212–31. http://dx.doi.org/10.1016/j.chemgeo.2005.09.021.

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21

Nesi, V. "Multiphase interchange inequalities." Journal of Mathematical Physics 32, no. 8 (August 1991): 2263–75. http://dx.doi.org/10.1063/1.529201.

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22

Mikos, Antonios G. "Multiphase biomedical materials." Journal of Controlled Release 16, no. 3 (August 1991): 366–67. http://dx.doi.org/10.1016/0168-3659(91)90016-7.

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23

Mikos, Antonios G. "Multiphase biomedical materials." Journal of Controlled Release 17, no. 2 (October 1991): 207. http://dx.doi.org/10.1016/0168-3659(91)90060-q.

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24

Heggo, Dalia, and Shinichi Ookawara. "Multiphase photocatalytic microreactors." Chemical Engineering Science 169 (September 2017): 67–77. http://dx.doi.org/10.1016/j.ces.2017.01.019.

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25

Shimanovich, Ulyana, Yang Song, Jasna Brujic, Ho Cheung Shum, and Tuomas P. J. Knowles. "Multiphase Protein Microgels." Macromolecular Bioscience 15, no. 4 (November 19, 2014): 501–8. http://dx.doi.org/10.1002/mabi.201400366.

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26

Vainshtein, P. B., and A. L. Yarin. "Multiphase fluid dynamics." International Journal of Multiphase Flow 18, no. 1 (January 1992): 157–58. http://dx.doi.org/10.1016/0301-9322(92)90014-8.

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27

Efimov, M. I., A. I. Kalenik, and S. D. Popovichenko. "Multiphase voltage source." Measurement Techniques 29, no. 8 (August 1986): 779–81. http://dx.doi.org/10.1007/bf00863971.

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28

Sugiyama, Kazuyasu, and Kosuke Hayashi. "PREFACE: MULTIPHASE FLOWS." Multiphase Science and Technology 35, no. 3 (2023): v—vi. http://dx.doi.org/10.1615/multscientechn.v35.i3.10.

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29

Sugiyama, Kazuyasu, and Kosuke Hayashi. "PREFACE: MULTIPHASE FLOWS." Multiphase Science and Technology 35, no. 4 (2023): v—vi. http://dx.doi.org/10.1615/multscientechn.v35.i4.10.

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30

Jorge-Badiola, Denis. "Advanced Multiphase Steels." Metals 13, no. 11 (November 10, 2023): 1871. http://dx.doi.org/10.3390/met13111871.

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31

Sugiyama, Kazuyasu, and Kosuke Hayashi. "PREFACE: MULTIPHASE FLOWS." Multiphase Science and Technology 36, no. 1 (2024): v—vi. http://dx.doi.org/10.1615/multscientechn.v36.i1.10.

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32

Caltagirone, Jean-Paul, Stéphane Vincent, and Céline Caruyer. "A multiphase compressible model for the simulation of multiphase flows." Computers & Fluids 50, no. 1 (November 2011): 24–34. http://dx.doi.org/10.1016/j.compfluid.2011.06.011.

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33

Saurel, Richard, and Rémi Abgrall. "A Multiphase Godunov Method for Compressible Multifluid and Multiphase Flows." Journal of Computational Physics 150, no. 2 (April 1999): 425–67. http://dx.doi.org/10.1006/jcph.1999.6187.

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34

Shi, Jianwei, Sijia Tao, Guangtai Shi, and Wenwu Song. "Effect of Gas Volume Fraction on the Energy Loss Characteristics of Multiphase Pumps at Each Cavitation Stage." Water 13, no. 16 (August 21, 2021): 2293. http://dx.doi.org/10.3390/w13162293.

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In the process of conveying a medium, when the inlet pressure is low, the cavitation phenomenon easily occurs in the pump, especially in the gas–liquid two-phase working condition. The occurrence of the cavitation phenomenon has a great impact on the performance of the multiphase pump. In this paper, the SST (sheard stress transport) k-ω turbulence model and ZGB (Zwart–Gerber–Belamri) cavitation model were used to simulate the helical axial flow multiphase pump (hereinafter referred to as the multiphase pump), and the experimental verification was carried out. The effect of gas volume fraction (GVF) on the energy loss characteristics in each cavitation stage of the multiphase pump is analyzed in detail. The study shows that the critical cavitation coefficient of the multiphase pump gradually decreases with the increase in GVF, which depresses the evolution of cavitation, and the cavitation performance of the multiphase hump is improved. The ratio of total loss and friction loss to total flow loss in the impeller fluid domain gradually increases with the development of cavitation, and the pressurization performance of the multiphase pump gradually decreases with the development of cavitation. The results of the study can provide theoretical guidance for the improvement of the performance of the multiphase pump.

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35

Al Hosani, E., and M. Soleimani. "Multiphase permittivity imaging using absolute value electrical capacitance tomography data and a level set algorithm." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2070 (June 28, 2016): 20150332. http://dx.doi.org/10.1098/rsta.2015.0332.

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Multiphase flow imaging is a very challenging and critical topic in industrial process tomography. In this article, simulation and experimental results of reconstructing the permittivity profile of multiphase material from data collected in electrical capacitance tomography (ECT) are presented. A multiphase narrowband level set algorithm is developed to reconstruct the interfaces between three- or four-phase permittivity values. The level set algorithm is capable of imaging multiphase permittivity by using one set of ECT measurement data, so-called absolute value ECT reconstruction, and this is tested with high-contrast and low-contrast multiphase data. Simulation and experimental results showed the superiority of this algorithm over classical pixel-based image reconstruction methods. The multiphase level set algorithm and absolute ECT reconstruction are presented for the first time, to the best of our knowledge, in this paper and critically evaluated. This article is part of the themed issue ‘Supersensing through industrial process tomography’.

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36

Kurbah, Kerdaris, Shashi M. Kanbur, Sukanta Deb, Susmita Das, Mami Deka, Anupam Bhardwaj, Hugh Riley Randal, and Selim Kalici. "A multiphase study of classical Cepheids in the Magellanic Clouds- Models and Observations." Proceedings of the International Astronomical Union 18, S376 (December 2022): 267–74. http://dx.doi.org/10.1017/s1743921323003563.

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AbstractThis work presents the study of multiphase relations of classical Cepheids in the Magellanic Clouds for short periods (log P < 1) and long periods (log P > 1). From the analysis, it has been found that the multiphase relations obtained using the models as well as observations are highly dynamic with pulsational phase. The multiphase relations for short and long periods are found to display contrasting behaviour for both LMC and SMC. It has been observed that the multiphase relations obtained using the models agree better with the observations in the PC plane in most phases in comparison to the PL plane. Multiphase relations obtained using the models display a clear distinction among different convection sets in most phases. Comparison of models and observations in the multiphase plane is one way to test the models with the observations and to constrain the theory of stellar pulsation.

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37

Chen, Tong, Xudong Liu, Biao Si, Yong Feng, Huifeng Zhang, Bing Jia, and Shengzhang Wang. "Comparison between Single-Phase Flow Simulation and Multiphase Flow Simulation of Patient-Specific Total Cavopulmonary Connection Structures Assisted by a Rotationally Symmetric Blood Pump." Symmetry 13, no. 5 (May 20, 2021): 912. http://dx.doi.org/10.3390/sym13050912.

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To accurately assess the hemolysis risk of the ventricular assist device, this paper proposed a cell destruction model and the corresponding evaluation parameters based on multiphase flow. The single-phase flow and multiphase flow in two patient-specific total cavopulmonary connection structures assisted by a rotationally symmetric blood pump (pump-TCPC) were simulated. Then, single-phase and multiphase cell destruction models were used to evaluate the hemolysis risk. The results of both cell destruction models indicated that the hemolysis risk in the straight pump-TCPC model was lower than that in the curved pump-TCPC model. However, the average and maximum values of the multiphase flow blood damage index (mBDI) were smaller than those of the single-phase flow blood damage index (BDI), but the average and maximum values of the multiphase flow particle residence time (mPRT) were larger than those of the single-phase flow particle residence time (PRT). This study proved that the multiphase flow method can be used to simulate the mechanical behavior of red blood cells (RBCs) and white blood cells (WBCs) in a complex flow field and the multiphase flow cell destruction model had smaller estimates of the impact shear stress.

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38

Aliseda, Alberto, and Theodore J. Heindel. "X-Ray Flow Visualization in Multiphase Flows." Annual Review of Fluid Mechanics 53, no. 1 (January 5, 2021): 543–67. http://dx.doi.org/10.1146/annurev-fluid-010719-060201.

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The use of X-ray flow visualization has brought a powerful new tool to the study of multiphase flows. Penetrating radiation can probe the spatial concentration of the different phases without the refraction, diffraction, or multiple scattering that usually produce image artifacts or reduce the signal-to-noise ratio below reliable values in optical visualization of multiphase flows; hence, X-ray visualization enables research into the three-dimensional (3D) structure of multiphase flows characterized by complex interfaces. With the commoditization of X-ray laboratory sources and wider access to synchrotron beam time for fluid mechanics, this novel imaging technique has shed light onto many multiphase flows of industrial and environmental interest under realistic 3D configurations and at realistic operating conditions (high Reynolds numbers and high volume fractions) that had defied study for decades. We present a broad survey of the most commonly studied multiphase flows (e.g., sprays, fluidized beds, bubble columns) in order to highlight the progress X-ray imaging has made in understanding the internal structure and multiphase coupling of these flows, and we discuss the potential of advanced tomography and time-resolved and particle tracking radiography for further study of multiphase flows.

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39

Kang, Yuanyuan, and Jianguo Lv. "Solution method of multiphase seepage sequence in heavy oil reservoir by steam injection considering numerical oscillation." Thermal Science, no. 00 (2022): 173. http://dx.doi.org/10.2298/tsci220720173k.

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In order to improve the dynamic control ability of multiphase flow in heavy oil reservoir by steam injection, he put forward the sequential solution method of multiphase flow in heavy oil reservoir by steam injection based on numerical oscillation, established saturation equation and dynamic equation of multiphase flow in heavy oil reservoir by steam injection, solved the output pressure of multiphase flow in heavy oil reservoir by pressure equation based on volume conservation, and established the sequential solution model of all-component model of multiphase flow in heavy oil reservoir by steam injection. The output pressure of multiphase seepage in steam injection-production heavy oil reservoir is transformed into parabolic variable, and the saturation and composition are hyperbolic variable models. Through the analysis method of saturation and composition characteristics of all-component model, combined with the pressure signal analysis of numerical oscillation, empirical mode decomposition and spectrum analysis methods are adopted to realize the velocity parameter analysis and multiphase seepage sequence analysis of steam injection-production heavy oil reservoir, and the numerical oscillation analysis and parameter estimation of multiphase seepage in steam injection-production heavy oil reservoir are realized by establishing the sequential solution algorithm of steam injection-production heavy oil reservoir. The simulation results show that this method is used to solve the multiphase seepage sequence of heavy oil reservoir by steam injection, and the parameter estimation accuracy is high, which improves the calculation efficiency of numerical simulation of steam injection and production. The calculation efficiency and accuracy of this algorithm in two-dimensional and three-dimensional examples with gravity are verified by examples.

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40

Ivanov, E. A., A. S. Klyuyev, A. A. Zharkovskii, and I. O. Borshchev. "Numerical Simulation of Multiphase Flow Structures in Openfoam Software Package." E3S Web of Conferences 320 (2021): 04016. http://dx.doi.org/10.1051/e3sconf/202132004016.

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Numerical simulation of various structures of multiphase flow in the pipe was performed using the OpenFOAM software package. A visual comparison of multiphase flow design structures for separated stratified-wave, plug and annular flow modes with experimental data is presented. For multiphase flow modelling the solver compressibleInterFoam was used. From the results of numerical modelling, it follows that the OpenFOAM software package allows correct prediction of multiphase flow modes in the pipe depending on Reynolds numbers for gas and liquid phases of the flow.

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41

Tuan, Wei Hsing. "Design of Multiphase Materials." Key Engineering Materials 280-283 (February 2007): 963–66. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.963.

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In the present study, several principles are introduced as the guidelines to design multi- phased materials. Each phase in the multiphase material can offer one function or property to the material. The functions contributed from the phases within the multiphase material can interact with each other. Such interactions can be tailored by suitable microstructure design. The Al2O3-ZrO2-Ni multiphase material is used to demonstrate the applications of the design principles.

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42

Apte, Mandar S., Ahmadbazlee Matzain, Hong-Quan Zhang, Michael Volk, James P. Brill, and Jeff L. Creek. "Investigation of Paraffin Deposition During Multiphase Flow in Pipelines and Wellbores—Part 2: Modeling." Journal of Energy Resources Technology 123, no. 2 (January 15, 2001): 150–57. http://dx.doi.org/10.1115/1.1369359.

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A Joint Industry Project to investigate paraffin deposition in multiphase flowlines and wellbores was initiated at The University of Tulsa in May 1995. As part of this JIP, a computer program, based on the molecular diffusion theory, was developed for prediction of wax deposition during multiphase flow in pipelines and wellbores. The program is modular in structure and assumes a steady-state, one-dimensional flow, energy conservation principle. This paper will describe the simulator developed for predicting paraffin deposition during multiphase flow that includes coupling of multiphase fluid flow, solid-liquid-vapor thermodynamics, multiphase heat transfer, and flow pattern-dependent paraffin deposition. Predictions of the simulator are compared and tuned to the experimental data by adjusting the film heat transfer and diffusion coefficients and the thermal conductivity of the wax deposit.

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43

Li, Huichuang, Wenwu Zhang, Liwei Hu, Baoshan Zhu, and Fujun Wang. "Studies on Flow Characteristics of Gas–Liquid Multiphase Pumps Applied in Petroleum Transportation Engineering—A Review." Energies 16, no. 17 (August 29, 2023): 6292. http://dx.doi.org/10.3390/en16176292.

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Flow and phase separation in gas–liquid multiphase pumps is easy to occur, which deteriorates their performance and mixed transportability. Many research achievements have been made in the experiment, CFD simulation and performance improvement of multiphase pumps. However, there are many challenges for the test technology, accurate numerical model development and gas–liquid flow control. This paper is mainly aimed at critically reviewing various technologies for experimental observation, flow calculation and analysis, and the optimization design of gas–liquid multiphase pumps. In this regard, the experimental results including the energy performance, flow pattern and bubble movement in the multiphase pump are presented in detail. Discussions on the turbulence model, multiphase flow model and bubble balance model are carried out for the flow prediction in such pumps. Various numerical results are presented, including energy performance, bubble distribution, vorticity, phase interaction and pressure fluctuation. Moreover, the flow control and optimization strategy are briefly introduced. Having carried out an extensive literature review of flow characteristics in multiphase pumps, the deficiencies of relevant fields and suggestions for future research direction are given.

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44

Butsky, Iryna S., Joseph N. Burchett, Daisuke Nagai, Michael Tremmel, Thomas R. Quinn, and Jessica K. Werk. "Ultraviolet signatures of the multiphase intracluster and circumgalactic media in the romulusc simulation." Monthly Notices of the Royal Astronomical Society 490, no. 3 (October 12, 2019): 4292–306. http://dx.doi.org/10.1093/mnras/stz2859.

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ABSTRACT Quasar absorption-line studies in the ultraviolet (UV) can uniquely probe the nature of the multiphase cool–warm (104 < T < 106 K) gas in and around galaxy clusters, promising to provide unprecedented insights into (1) interactions between the circumgalactic medium (CGM) associated with infalling galaxies and the hot (T > 106 K) X-ray emitting intracluster medium (ICM), (2) the stripping of metal-rich gas from the CGM, and (3) a multiphase structure of the ICM with a wide range of temperatures and metallicities. In this work, we present results from a high-resolution simulation of an $\sim 10^{14} \, \mathrm{M}_{\odot }$ galaxy cluster to study the physical properties and observable signatures of this cool–warm gas in galaxy clusters. We show that the ICM becomes increasingly multiphased at large radii, with the cool–warm gas becoming dominant in cluster outskirts. The diffuse cool–warm gas also exhibits a wider range of metallicity than the hot X-ray emitting gas. We make predictions for the covering fractions of key absorption-line tracers, both in the ICM and in the CGM of cluster galaxies, typically observed with the Cosmic Origins Spectrograph aboard the Hubble Space Telescope (HST). We further extract synthetic spectra to demonstrate the feasibility of detecting and characterizing the thermal, kinematic, and chemical composition of the cool–warm gas using H i, O vi, and C iv lines, and we predict an enhanced population of broad Ly α absorbers tracing the warm gas. Lastly, we discuss future prospects of probing the multiphase structure of the ICM beyond HST.

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Yang, Xu, and Zongchang Qu. "Suction port design for a synchronal rotary multiphase pump." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 1 (November 10, 2016): 127–32. http://dx.doi.org/10.1177/0954408916678268.

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The synchronal rotary multiphase pump is a new type of positive-displacement pump for multiphase boosting. Given that the discharge valve is eliminated in the synchronal rotary multiphase pump, the radial suction port as used in traditional rotary compressors is no longer suitable for the gas–liquid working condition. Thus, a special design for the axial suction port is presented to ensure the synchronal rotary multiphase pump’s flexibility in handling work fluids with any inlet gas volume fraction. The design concept and working principle of the axial suction port of the synchronal rotary multiphase pump are introduced herein, and a geometrical model of the suction port is established to calculate the critical dimensions for the synchronal rotary multiphase pump manufacture. The results show that the axial suction port’s design avoids the inner compression of work fluids and the back flow from the outlet to the inlet of the synchronal rotary multiphase pump during operation, which meets the requirements for operating under the gas–liquid working condition. The matching between the variation in the sectional area of the suction port and the varying trend of suction volume results in an acceptable sectional velocity of suction flow. Although the designed axial suction port reduces the suction angle range in a revolution, the decrease in the volumetric efficiency is negligible.

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BEREŠ, Matej, and Dobroslav KOVÁČ. "DIGITAL PULSE GENERATOR FOR MULTIPHASE BOST CONVERTER." Acta Electrotechnica et Informatica 14, no. 4 (December 1, 2014): 46–51. http://dx.doi.org/10.15546/aeei-2014-0041.

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Falcucci, Giacomo, Stefano Ubertini, Chiara Biscarini, Silvia Di Francesco, Daniele Chiappini, Silvia Palpacelli, Alessandro De Maio, and Sauro Succi. "Lattice Boltzmann Methods for Multiphase Flow Simulations across Scales." Communications in Computational Physics 9, no. 2 (February 2011): 269–96. http://dx.doi.org/10.4208/cicp.221209.250510a.

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AbstractThe simulation of multiphase flows is an outstanding challenge, due to the inherent complexity of the underlying physical phenomena and to the fact that multiphase flows are very diverse in nature, and so are the laws governing their dynamics. In the last two decades, a new class of mesoscopic methods, based on minimal lattice formulation of Boltzmann kinetic equation, has gained significant interest as an efficient alternative to continuum methods based on the discretisation of the NS equations for non ideal fluids. In this paper, three different multiphase models based on the lattice Boltzmann method (LBM) are discussed, in order to assess the capability of the method to deal with multiphase flows on a wide spectrum of operating conditions and multiphase phenomena. In particular, the range of application of each method is highlighted and its effectiveness is qualitatively assessed through comparison with numerical and experimental literature data.

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Jiang, Bo, Li-Jun Chen, Guang-Qiang Yin, Yu-Xuan Wang, Wei Zheng, Lin Xu, and Hai-Bo Yang. "Multiphase transition of supramolecular metallogels triggered by temperature." Chemical Communications 53, no. 1 (2017): 172–75. http://dx.doi.org/10.1039/c6cc08382j.

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Atkinson, David I., Oyvind Reksten, Gerald Smith, and Helge Moe. "High-Accuracy Wet-Gas Multiphase Well Testing and Production Metering." SPE Journal 11, no. 02 (June 1, 2006): 199–205. http://dx.doi.org/10.2118/90992-pa.

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Summary Dedicated wet-gas flowmeters are now commercially available for the measurement of gas and liquid flow rates and offer a more compact measurement solution than does the traditional separator approach. The interpretation models of traditional multiphase flowmeters emphasize the liquid rate measurements and have been used to well test and meter mostly liquid-rich flow streams. These models were not developed for the measurement of gas flow rates, particularly those of wet gas. A new interpretation is described that allows a traditional multiphase flowmeter to operate in a dual mode either as a multiphase meter or as a wet-gas meter in 90 to 100% gas. The new interpretation model was developed for a commercially available multiphase flowmeter consisting of a venturi and a dual-energy composition meter. This combination results in excellent predictions of the gas flow rate; the liquid rate prediction is made with acceptable accuracy and no additional measurements. The wet gas and low-liquid-volume-fraction interpretation model is described together with the multiphase flowmeter. Examples of applying this model to data collected on flow loops are presented, with comparison to reference flow rates. The data from the Sintef and NEL flow loops show an error (including the reference meter error) in the gas flow rate, better than ± 2% reading (95% confidence interval), at line conditions; the absolute error (including the reference meter error) in the measured total liquid flow rate at line conditions was better than ± 2 m3/h (< ± 300 B/D: 95% confidence interval). This new interpretation model offers a significant advance in the metering of wet-gas multiphase flows and yields the possibility of high accuracies to meet the needs of gas-well testing and production allocation applications without the use of separators. Introduction There has been considerable focus in recent years on the development of new flow-measurement techniques for application to surface well testing and flow-measurement allocation in multiphase conditions without separating the phases. This has resulted in new technology from the industry for both gas and oil production. Today, there are wet-gas flowmeters, dedicated to the metering of wet-gas flows, and multiphase meters, for the metering of multiphase liquid flows. The common approach to wet-gas measurement relates gas and liquid flows to a "pseudo-gas flow rate" calculated from the standard single-phase equations. This addresses the need for gas measurement in the presence of liquids and can be applied to a limit of liquid flow [or gas volume fraction, (GVF)], though the accuracy of this approach decreases with decreasing GVF. The accurate determination of liquid rates by wet-gas meters is restricted in range. The application and performance of multiphase meters has been well documented through technical papers and industry forums, and after several years of development is maturing (Scheers 2004). Some multiphase measurement techniques can perform better, and the meters provide a more compact solution, than the traditional separation approach. It is not surprising that the use of multiphase flowmeters has grown significantly, the worldwide number doubling in little over a 2-year period (Mehdizadeh et al. 2002). Multiphase-flowmeter interpretation emphasizes the liquid rate measurement, and the application of multiphase flowmeters has been predominantly for liquid-rich flow stream allocation and well testing.

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Petrov, V. N., Yu K. Evdokimov, O. K. Shabalina, and S. V. Petrov. "Modeling of multiphase flows." Automation, Telemechanization and Communication in Oil Industry, no. 1 (2019): 5–10. http://dx.doi.org/10.33285/0132-2222-2019-1(546)-5-10.

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