The Characteristics of Pitot Tubes in Dilute Polymer Solutions

Abstract

The characteristics of Pitot tubes in dilute polymer solutions are experimentally studied with respect to the effects of the tube diameter, the magnitude of the velocity and the concentration of the solutions. It is shown that the coefficient of Pitot tube becomes larger than unity as Reynolds number or an elastic effect increases. It represents a remarkable dependence on Reynolds number, but it is characterized by comparative stability for a large outer diameter. An empirical equation for the coefficient of Pitot tube in dilute polymer solutions is obtained by using an analytical result of the flow around a stagnation point.