Now showing items 1-4 of 4

    • Entrainment of coarse particles in turbulent flows: An energy approach 

      Valyrakis, Manousos; Diplas, Panayiotis; Dancey, Clinton L. (American Geophysical Union, 2013-03-01)
      The entrainment of coarse sediment particles under the action of fluctuating hydrodynamic forces is investigated from an energy perspective. It is demonstrated that the entrainment of a grain resting on the channel boundary ...
    • Impulse and particle dislodgement under turbulent flow conditions 

      Celik, Ahmet Ozan; Diplas, Panayiotis; Dancey, Clinton L.; Valyrakis, M. (American Institute of Physics, 2010-04-01)
      In this study, we investigated the role of turbulence fluctuations on the entrainment of a fully exposed grain near threshold flow conditions. Experiments were carried out to measure synchronously the near bed flow velocity ...
    • Instantaneous pressure measurements on a spherical grain under threshold flow conditions 

      Celik, Ahmet Ozan; Diplas, Panayiotis; Dancey, Clinton L. (Cambridge University Press, 2014-02-01)
      The aim of this investigation was to experimentally examine the surface pressures and resulting forces on an individual sediment grain whose size is comparable to the scales of the turbulent channel flow in an effort to ...
    • Instantaneous turbulent forces and impulse on a rough bed: Implications for initiation of bed material movement 

      Celik, Ahmet Ozan; Diplas, Panayiotis; Dancey, Clinton L. (American Geophysical Union, 2013-04-01)
      The overall objective of this study is to identify the physical mechanisms responsible for the entrainment of an exposed particle subject to rapidly fluctuating hydrodynamic forces in the case of channel flow with a fully ...