Problems in the theory and design of electromagnetic flowmeters for dielectric liquids - Part 2b: theory of noise generation by charged particles

摘要

This paper describes an analytical model of the generation of noise by charged particles in electromagnetic flowmeters working with dielectric fluids. Using estimated charge values for the particles, the model predicts that particle noise dominates in the case of dirty liquids, with very small particle concentrations producing high levels of noise. Validation of the theory is done by comparison with available experimental data of noise in BP 180 oil for different flow rates and electrode lengths. The model can be used to study the noise spectrum of a particular meter design when the liquid and particle physical properties are known.