ABSTRACT
Fully developed pipe flow has been a favorite configuration in the studies of fluid dynamics because of the absence of the nonlinear inertlal terms in the momentum equation by its definition. This chapter deals with fundamentals concerning interactions in dilute suspensions. Measurements and correlation of momentum transfer in fully developed pipe flow are useful because of applications in estimating the power requirements for transferring fluids or suspensions over a distance. In the case of gas-particle suspension in pipe flow, the particle charge effect is significant while the gravity effect may be small for high velocity flow in small pipes. In a dilute suspension, the motion of the fluid phase is unaffected by the presence of the particle phase. Extensive experimental studies predated the formulation of a dilute suspension. The electrostatic probe or ball probe was used earlier, with the probe theory developed subsequently. A current was measured when the sampling probe discharged to ground through an electrometer.
