On the Theoretical Investigations of Float-Area-Type Flow Meters

Abstract

In order to obtain basic data for designing float-area-type flow meters for various kinds of fluid to be used, a fluid-dynamic analysis on the laminar boundary layer in the annular clearance between the float and the tapered tube is developed. In this analysis a new velocity profile in the laminar boundary layer is used and more precise theoretical results than those reported before about the performance characteristics, i.e. the drag coefficient of a float and the relation between the position of the float and the flow rate, of a float-area-type flow meter are obtained. Results of an experiment carried out with a spindle oil are compared with those of theoretical analysis and good agreement is found to exist between them.