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• Journal article
  Wray AW, Papageorgiou DT, Craster RV, Sefiane K, Matar OKet al., 2014,
  , LANGMUIR, Vol: 30, Pages: 5849-5858, ISSN: 0743-7463
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  • Citations: 58
• Journal article
  Karapetsas G, Sahu KC, Sefiane K, Matar OKet al., 2014,
  , LANGMUIR, Vol: 30, Pages: 4310-4321, ISSN: 0743-7463
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  • Citations: 97
• Journal article
  Xie Z, Pavlidis D, Percival JR, Gomes JLMA, Pain CC, Matar OKet al., 2014,
  , International Journal of Multiphase Flow, ISSN: 0301-9322

  Multiphase flows are often found in industrial and practical engineering applications, including bubbles, droplets, liquid film and waves. An adaptive unstructured mesh modelling framework is employed here to study interfacial flow problems, which can modify and adapt anisotropic unstructured meshes to better represent the underlying physics of multiphase problems and reduce computational effort without sacrificing accuracy. The numerical framework consists of a mixed control volume and finite element formulation, a 'volume of fluid'-type method for the interface capturing based on a compressive control volume advection method and second-order finite element methods. The framework also features a force-balanced algorithm for the surface tension implementation, minimising the spurious velocities often found in such flows. Numerical examples of the Rayleigh-Taylor instability and a rising bubble are presented to show the ability of this adaptive unstructured mesh modelling framework to capture complex interface geometries and also to increase the efficiency in multiphase flow simulations.

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• Journal article
  Zadrazil I, Matar OK, Markides CN, 2014,
  , International Journal of Multiphase Flow, Vol: 60, Pages: 87-102, ISSN: 0301-9322

  Downwards co-current gas–liquid annular flows were studied experimentally and characterized. Anadvanced optical laser-based measurement technique, namely Planar Laser-Induced Fluorescence (PLIF),was used for the visualization of the annular flow over a range of liquid Reynolds numbers ReL ¼ 306—1532 and gas Reynolds numbers ReG ¼ 0—84600. Four distinct flow regimes, namely the ‘dual-wave’, ‘thick ripple’, ‘disturbance wave’ and ‘regular wave’ regimes, have been identified based on qualitative information and a consequent quantitative analysis that provided information on the film thickness, interface and wave statistics, and gas entrainment into the liquid film. The mean film thickness data are generally in good agreement with previous studies. Evidence suggests that the turbulent gas phase affects strongly the shape of the interface, and that the mechanism for gas entrainment into the liquid film is strongly reliant on the existence of large-amplitude waves.

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• Journal article
  Gherase D, Conroy D, Matar OK, Blackmond DGet al., 2014,
  , CRYSTAL GROWTH & DESIGN, Vol: 14, Pages: 928-937, ISSN: 1528-7483
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  • Citations: 31
• Journal article
  Saenz PJ, Valluri P, Sefiane K, Karapetsas G, Matar OKet al., 2014,
  , PHYSICS OF FLUIDS, Vol: 26, ISSN: 1070-6631
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  • Citations: 33
• Journal article
  Ibarra R, Markides CN, Matar OK, 2014,
  , Multiphase Science and Technology, Vol: 26, Pages: 171-198, ISSN: 0276-1459

  © 2014 by Begell House, Inc. This paper presents a review of the co-current flow of two immiscible liquids in horizontal and slightly inclined pipes. Liquid-liquid flows are present in a wide variety of industrial processes, such as chemicals, pharmaceuticals, and food processing. However, this phenomenon is mainly studied in the oil industry, especially in the analysis of oil-water mixtures encountered in long transportation pipelines from the wellhead to the processing facility. The hydrodynamic behavior of liquid-liquid flows is more complex than that of gas-liquid flows because of density ratio, viscosity ratio, interfacial forces, and pipe wettability. This means that a significant number of different flow patterns can be obtained from different fluid properties and pipe characteristics. Furthermore, the flow pattern classification of liquid-liquid flows is arbitrary and several researchers use their own classification, complicating comparison and analysis of flow pattern maps. In this paper, a unified flow pattern classification for liquid-liquid flow is proposed. This classification enables the direct comparison of flow pattern maps for further analysis.

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• Journal article
  Kuchin IV, Matar OK, Craster RV, Starov VMet al., 2014,
  , SOFT MATTER, Vol: 10, Pages: 6024-6037, ISSN: 1744-683X
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  • Citations: 13
• Journal article
  Heyes DM, Smith ER, Dini D, Zaki TAet al., 2014,
  , The Journal of Chemical Physics, Vol: 140, Pages: ---
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• Journal article
  Purvis JA, Mistry RD, Markides CN, Matar OKet al., 2013,
  , PHYSICS OF FLUIDS, Vol: 25, ISSN: 1070-6631
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  • Citations: 5

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