Khodaverdian, Alfred; (1993) An experimental study of added mass effects in two phase solid/liquid media. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

This thesis describes the results of a series of experimental studies in which the added mass and drag experienced by a 25 mm sphere oscillating in a two phase system, consisting of bonded solid particles in liquid media are measured in a variety of configurations using a remote drive vibrating reed technique. The arrangements considered investigate the effects of surface roughness, proximity and orientation of neighbouring particles, bed voidage together with variations in fluid density and viscosity, expressed in terms of the Stokes number in the range of 45-1100. Three types of expressions for the subsequent prediction of added mass are produced. The first starts with the simple notion of the hydraulic diameter to modify the Stokes theoretical expression for added mass obtained from potential flow analysis to produce an equation for the variation of the added mass with bed voidage for a smooth sphere in inviscid fluid media. The correlation is then validated by experimental evidence. The second expression is obtained by correlating the experimentally measured values of added mass with bed voidage and surface roughness in inviscid fluid media. The last expression, applicable to smooth particles in viscous media, takes into account the effects of Stokes number as well as bed voidage. Finally the experimentally obtained results are employed to produce improved correlations for predicting the stability criteria for liquid fluidised beds.

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