6 - Instrumentation for Fluid-Particle Flow: Electromagnetics

Abstract

This chapter reviews several instrumentations for measuring fluid-particle flow, focusing on electromagnetics. Electromagnetically based flow metering encompasses electrical, magnetic, and optical techniques. The chapter outlines the fundamental principle of each electromagnetic technique, with a focus on what each technique can measure. Electrical techniques primarily measure the electrical impedance of a mixed-phase medium. Optical or radiometric techniques for measuring solids concentration are based on the dependence of attenuation and scattering of an optical beam or radiation on the number of particles in the optical path. Magnetic flowmeter measures the induced electrical field strength when a conducting fluid flows through a magnetic field has been developed and applied to single-phase conducting flows, its application to the monitoring of solid/liquid flows is still infrequent..Electromagnetic flowmeters are mainly applied to single-phase conducting fluids, such as liquid metals, water-based industrial liquids, and blood. A brief description of the Coriolis flowmeter is also presented because it is widely used in industrial processes. A capacitive flowmeter, applicable only to slurries with nonconducting fluids, exhibits many attractive features that are often required by industrial processes.It is mentioned that the capacitive mass flowmeter can be a reliable instrument for measuring the flow of dilute suspended solids. It mentions the Pulsed Neutron Activation (PNA) Technique, which is an is an on-line tagging method.