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  • Journal article
    Conroy DT, Craster RV, Matar OK, Cheng L-J, Chang H-Cet al., 2012,

    Nonequilibrium hysteresis and Wien effect water dissociation at a bipolar membrane

    , PHYSICAL REVIEW E, Vol: 86, ISSN: 1539-3755
  • Conference paper
    Zadrazil I, Markides CN, Matar OK, Naraigh LO, Hewitt GFet al., 2012,

    Characterisation of Downwards Co-Current Gas-Liquid Annular Flows

    , Turbulence, Heat and Mass Transfer 7, Publisher: Begell House

    The hydrodynamic characteristics of downwards co-current two-phase (gas-liquid) flows inside avertical tube (ID = 32 mm) have been investigated experimentally. Advanced optical techniques, namely LaserInduced Fluorescence and Particle Tracking Velocimetry, were utilised for the characterisation of these flowsover a wide range of gas and liquid superficial velocities (U_G = 0 – 34 m/s and U_L = 0.034 – 0.182 m/s),corresponding to Reynolds numbers Re_G = 0 – 84,600 and Re_L = 1,230 – 6,130. A flow regime map, whichcontains a previously unreported flow regime, is constructed based on the flow observations. The quantitativeanalysis of the liquid films allows the generation of film thickness, wave frequency, bubble size, bubblefrequency and velocity profile data. It was found that the different observed flow regimes posses a characteristiccombination of the investigated quantitative parameters. A model, based on modified mixing-length theory, wasused to predict the liquid film velocity profiles and good agreement was found with the experimental results.

  • Journal article
    Karapetsas G, Matar OK, Valluri P, Sefiane Ket al., 2012,

    Convective Rolls and Hydrothermal Waves in Evaporating Sessile Drops

    , LANGMUIR, Vol: 28, Pages: 11433-11439, ISSN: 0743-7463
  • Journal article
    Wray AW, Matar O, Papageorgiou DT, 2012,

    Non-linear waves in electrified viscous film flow down a vertical cylinder

    , IMA JOURNAL OF APPLIED MATHEMATICS, Vol: 77, Pages: 430-440, ISSN: 0272-4960
  • Report
    Smith E, Anton L, 2012,

    Scalable coupling of Molecular Dynamics (MD) and Direct Numerical Simulation (DNS) of multi-scale flows


    The goal of this dCSE project was to develop the software infrastructure to couple highpreformance fluid and molecular dynamics solvers. This captures important details of localisedfluid flow at the molecular level whilst preserving the efficiency of the continuum computationin the rest of the domain. The result is a verified and scalable library which links a continuumfluid dynamics (CFD) code to a molecular dynamics code.

  • Journal article
    Spandagos C, Goudoulas TB, Luckham PF, Matar OKet al., 2012,

    Surface Tension-Induced Gel Fracture. Part 2. Fracture of Gelatin Gels

    , LANGMUIR, Vol: 28, Pages: 8017-8025, ISSN: 0743-7463
  • Journal article
    Smith ER, Heyes DM, Dini D, Zaki TAet al., 2012,

    Control-volume representation of molecular dynamics

    , Physical Review E, Vol: 85, Pages: 056705-056705, ISSN: 1539-3755

    A molecular dynamics (MD) parallel to the control volume (CV) formulation of fluid mechanics is developedby integrating the formulas of Irving and Kirkwood [J. Chem. Phys.18, 817 (1950)] over a finite cubic volumeof molecular dimensions. The Lagrangian molecular system is expressed in terms of an Eulerian CV, whichyields an equivalent to Reynolds’ transport theorem for the discrete system. This approach casts the dynamics ofthe molecular system into a form that can be readily compared to the continuum equations. The MD equationsof motion are reinterpreted in terms of a Lagrangian-to-control-volume (LCV) conversion functionθifor eachmoleculei.TheLCVfunction and its spatial derivatives are used to express fluxes and relevant forces across thecontrol surfaces. The relationship between the local pressures computed using the volume average [Lutsko,J.Appl. Phys.64, 1152 (1988)] techniques and the method of planes [Toddet al.,Phys.Rev.E52, 1627 (1995)]emerges naturally from the treatment. Numerical experiments using the MD CV method are reported forequilibrium and nonequilibrium (start-up Couette flow) model liquids, which demonstrate the advantages ofthe formulation. The CV formulation of the MD is shown to be exactly conservative and is, therefore, ideallysuited to obtain macroscopic properties from a discrete system.

  • Journal article
    Spandagos C, Goudoulas TB, Luckham PF, Matar OKet al., 2012,

    Surface Tension-Induced Gel Fracture. Part 1. Fracture of Agar Gels

    , LANGMUIR, Vol: 28, Pages: 7197-7211, ISSN: 0743-7463
  • Journal article
    Mavromoustaki A, Matar OK, Craster RV, 2012,

    Dynamics of a climbing surfactant-laden film II: Stability

    , JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 371, Pages: 121-135, ISSN: 0021-9797
  • Journal article
    Mavromoustaki A, Matar OK, Craster RV, 2012,

    Dynamics of a climbing surfactant-laden film - I: Base-state flow

    , JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 371, Pages: 107-120, ISSN: 0021-9797

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