.... In the case of gas-liquid-sand (multiphase) flow, the flow regime is stratified. The critical velocity is defined as the fluid velocity required to keep the solid particles continuously moving. Generally, the critical velocity is considered to have a direct relationship with the solid concentration...

... ABSTRACT An experimental study was conducted to investigate the effect of particle size on the critical velocity and near wall turbulence characteristics of water flow over the sand bed deposited in a horizontal pipeline. Industrial sands of four mesh sizes (20/40, 30/50, 40/70, 100) were used...

... surveillance production logging experiment gas flow rate silica sand particle upstream oil & gas pipe size pipe critical velocity flow rate particle concentration water-air flow particle size liquid velocity concentration glass bead superficial gas velocity Experimental study of low...

... in stratified multiphase (liquidgas) flow scenarios. Comparisons of the proposed model predictions to experimental data and existing models are discussed. experimental data reservoir surveillance critical velocity prediction kouba chevron energy technology company production control production...