عنوان مقاله [English]
In this paper, a new structure of an electromagnetic flow meter capable of measuring the velocity profile in a rectangular channel is presented. Common electromagnetic flowmeters measure the average velocity and are not capable of detecting velocity profiles in the cross-section of the channel. An array electromagnet with the ability to control the magnetic field across the channel is used to measure the velocity profile. The dimensions of the rectangular channel are 6 × 150 mm2 and the magnetic field is created by five coils with a low carbon iron core with a wire diameter of 0.3 mm. 20% NaoH solution with a conductivity of 4 S/m is used as the fluid passing through the flowmeter. An electromagnetic arrayed flowmeter is fabricated and experimentally tested in a closed path. Three-dimensional simulations of flowmeter including magnetic field, fluid velocity and induced current at the electrodes are performed in the finite element software COMSOL.The arrayed electromagnetic flow meter is experimentally and numerically investigated when the magnetic field was uniform and the array is also activated separately. Also, the parabolic and linear inlet flow profiles, with speed changes from 0 to 10 liters per minute, are applied to the inlet and the flowmeter output signal is recorded. The experimental and simulation results have a good fit (mean error 16%) and show the successful performance of the array flowmeter in measuring the channel cross-sectional velocity profile.