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Browsing Mathematics & Statistics by Author "O'Brien, Stephen B.G."

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Browsing Mathematics & Statistics by Author "O'Brien, Stephen B.G."

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  • Moroney, Kevin M.; Lee, William T.; O'Brien, Stephen B.G.; Suijver, F.; Marra, Johan (Society for Industrial and Applied Mathematics, 2016)
    Extraction of coffee solubles from roast and ground coffee is a highly complex process, depending on a large number of brewing parameters. We consider a recent, experimentally validated, model of coffee extraction, describing ...
  • Haynes, Matthew; O'Brien, Stephen B.G.; Benilov, Eugene (AIP Publishing, 2016)
    This paper uses asymptotic techniques to find the shape of a two dimensional liquid bridge suspended between two vertical walls. We model the equilibrium bridge shape using the Laplace-Young equation. We use the Bond number ...
  • Moroney, Kevin M.; Lee, William T.; O'Brien, Stephen B.G.; Suijver, Freek; Marra, Johan (SpringerOpen, 2016)
    The extraction of coffee solubles from roasted and ground coffee is a complex operation, the understanding of which is key to the brewing of high quality coffee. This complexity stems from the fact that brewing of coffee ...
  • Vo, Tuoi T.N.; McGuinness, Mark; Hegarty, Alan F.; O'Brien, Stephen B.G.; O'Sullivan, Kevin; Healy, Sandra (Springer, 2016)
    A blind source signal separation problem that was brought to a Study Group in Limerick in 2013 required a way to prevent the gait of a jogger from masking the heartbeat, when detected by a simple photodiode that measures ...
  • Moroney, Kevin M. (Univeristy of Limerick, 2016)
    Industrial and manufacturing processes are an abundant source of rich and complex problems amenable to investigation with mathematical logic and techniques. Once a problem is identi ed and the right questions are ...
  • Gordon, Andrew (University of Limerick, 2013)
    Polymer electrolyte fuel cells (PEFCs) are versatile electrochemical devices that convert the chemical energy of a fuel, such as hydrogen, and an oxidant, such as air-derived oxygen, directly into electricity, both cleanly ...
  • McInerney, Niall (University of Limerick, 2019)
    In the first part of this thesis, mathematical models describing solvent and drug diffusion in glassy polymers are investigated using both numerical and approximate methods. These models are analysed using formal ...
  • Vynnycky, Michael; Saleem, S.; Devine, K .M.; Florio, B. J.; Mitchell, Sarah L.; O'Brien, Stephen B.G. (The Royal Society, 2017)
    Asymptotic methods are employed to revisit an earlier model for oscillation-mark formation in the continuous casting of steel. A systematic non-dimensionalization of the governing equations, which was not carried out ...
  • Lee, William T.; Kaar, S.; O'Brien, Stephen B.G. (American Assocation of Physics Teachers, 2018)
    A surprising phenomenon witnessed by many is the sinking bubbles seen in a settling pint of stout beer. Bubbles are less dense than the surrounding fluid so how does this happen? Previous work has shown that the explanation ...
  • Benilov, Eugene; Barros, Ricardo; O'Brien, Stephen B.G. (American Physical Society, 2016)
    We investigate the stability of thin liquid curtains with respect to two-dimensional perturbations. The dynamics of perturbations with wavelengths exceeding (or comparable to) the curtain's thickness are examined using the ...
  • Haynes, Matthew (University of Limerick, 2019)
    This thesis examines the static equilibrium shapes and stability of various capillary surfaces. The equilibrium shapes are accurately approximated using asymptotic series solutions in the micro-gravity limit. The stability ...
  • Robinson, Marguerite; Fowler, Andrew C.; Alexander, A.J.; O'Brien, Stephen B.G. (American Institute of Physics, 2008)
    We describe a simple model of a bubbly two-phase flow which is able to explain why waves propagate downward when a pint of Guinness is poured, and also how the waves are generated. Our theory involves a physically based ...

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