Electromagnetic flowmeter measurement and numerical computation of laminar flow transport pipeline flow quantity

摘要

Electromagnetic flowmeter was adopted to measure the flow quantity of coal water slurry (CWS) transport pipeline, and the average flow velocity of pipeline was calculated by using the measured inductive electromotive force value. Then the Reynolds number of fluid in the pipeline was calculated and the fluid in the CWS transport pipeline was proved to be flowing in the laminar flow state. The axial velocity of the axial flow field of CWS transport pipeline flowing in the laminar flow state was obtained by using the finite element method. The distribution of axial velocity in the CWS transport pipeline and the relationship curve between axial velocity and cross sectional diameter of pipeline axial flow field were drawn in two-dimensional plane separately. Finally, the actual average velocity and flow quantity measured by electromagnetic flowmeter and the numerical average velocity and flow quantity computed by finite element method were compared, according to the comparison results, the relative error between the average velocity measured by electromagnetic flowmeter and the average velocity computed by the finite element methods is less than 1%, and the relative error between the flow quantity measured by electromagnetic flowmeter and the flow quantity computed by the finite element methods is either less than 1%.