Regular Article

Hydrodynamic description of a vibrofluidized granular bed driven at high frequency

¹ Department of Mechanical Engineering, Capital University of Science and Technology, Islamabad, Pakistan
² Department of Mechanical Engineering, University of Engineering and Technology, Taxila, Pakistan

^a e-mail: ndahmed@gmail.com

Received: 23 April 2016
Revised: 27 June 2016
Accepted: 25 July 2016
Published online: 12 August 2016

Abstract

Results are reported for a dry granular bed vertically excited at high and low frequencies with constant peak base velocity. Previous experimental data sets using Nuclear Magnetic Resonance are used for comparison at low (~38 Hz) and high (~11 kHz) vibration frequencies. Packing fractions and granular temperatures are compared against hydrodynamic and molecular dynamics simulation models. At low frequency hydrodynamic and MD simulations results show the presence of a heat wave. Whilst at high frequencies soft sphere potential based MD simulations highlight the role of finite duration collisions between particles and the vibrating wall. In this region the timescales of vibration and collision duration are not well separated, as observed in experimental results.