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  1. Article

    Open Access

    Porosity Measurement of Low Permeable Materials Using Gas Expansion Induced Water Intrusion Porosimetry (GEIWIP)

    Porosity measurement is a key factor to identify the hydraulic performance of low permeable porous materials (e.g. rock or concrete). Porosimetry tests such as Mercury Intrusion Porosimetry (MIP), Nuclear Magn...

    Miad Jarrahi, Douglas W. Ruth, Mohamed T. Bassuoni… in Scientific Reports (2019)

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    Article

    A Comment on “Investigation of Various Pressure Transient Techniques on Permeability Measurement of Unconventional Gas Reservoirs” by R.-M. Feng and R. Pandey

    Douglas W. Ruth in Transport in Porous Media (2018)

  3. No Access

    Article

    Spontaneous Counter-Current Imbibition into Core Samples with All Faces Open

    Counter-current imbibition occurs when brine spontaneously displaces oil from a very strongly water-wet rock. Experiments are usually carried out on cylindrical core plugs which have all of their faces open, m...

    Geoffrey Mason, Herbert Fischer, Norman R. Morrow… in Transport in Porous Media (2009)

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    Article

    An Approximate Analytical Solution for Counter-Current Spontaneous Imbibition

    An approximate analytical solution is provided for one-dimensional, counter- current, spontaneous imbibition of a wetting phase (water) into a semi-infinite porous medium. The solution is based on the assumpti...

    Douglas W. Ruth, Yu Li, Geoffrey Mason, Norman R. Morrow in Transport in Porous Media (2007)

  5. No Access

    Article

    Steady-state solutions to Bentsen's equation

    Based on experimentally observed phenomena and the physical requirement of a unique value of saturation at any location within a porous medium, a restrictive condition for a valid solution to Bentsen's equatio...

    Chonghui Shen, Douglas W. Ruth in Transport in Porous Media (1994)

  6. No Access

    Article

    On iterative and Monte Carlo solutions of the Boltzmann equation

    The two most commonly used techniques for solving the Boltzmann equation, with given boundary conditions, are first iterative equations (typically the BGK equation) and Monte Carlo methods. The present work ex...

    Douglas W. Ruth, Alister K. MacPherson in Zeitschrift für angewandte Mathematik und … (1974)