Understanding and Generalization of Geometric Factor Based on Measurements with Point Electrode (Dependence of Geometric Factor behind Orifice on Orifice-to-Pipe Diameter Ratio)

Abstract

In the prediction of Flow Accelerated Corrosion (FAC), quantitative prediction of wall mass transfer coefficient or the geometric factor defined as the ratio of wall mass transfer coefficient in the piping systems (such as orifices, T-junctions, elbows) to that in a straight pipe is very important. Because of the entrance effect, the geometric factor based on point electrode is smaller than that obtained from the case in which the whole area is active. We correct the mass transfer coefficients measured by point electrode downstream of an orifice, and the corrected values are compared with previous results. The maximum values of geometric factor downstream of an orifice are expressed as a function of orifice-to-pipe diameter ratio.