Performance of two electromagnetic flowmeters mounted downstream of a 90° mitre bend/reducer combination

Abstract The influence of a 90° mitre bend/reducer combination on the performance of two geometrically similar electromagnetic flowmeters has been investigated, the pair of electrodes for each meter being 7.667 diameters downstream of the reducer’s exit. At a distance of 1.667 diameters upstream from the electrode plane laser Doppler anemometry measurements show that the mean and root mean square velocity profiles are significantly fuller and skewed, in both the vertical and horizontal planes, especially for the lowest flow-rate. The results show that the percentage meter error, for the higher flow-rates was at or below 1%, this figure increases to between 2 and 4% for the lower flow-rates investigated.