The results of a series of experiments on the measurement of the angle of separation for flow over steel spheres suspended in a vertical 5.18 cm ID pipeline with and without a drag reducing aqueous polymer solution are presented. Data were obtained for sphere- to-pipe diameter ratios of 0.74 and 0.925 with polymer concentrations of 0, 25, 50, and 100 wppm over a Reynolds number range of 1633 to 29400 for single spheres and trains of up to three spheres rigidly connected. It was found that relatively dilute polymer solutions can considerably affect the separation angle. Furthermore, that the angle is dependent on the diameter ratio, number of spheres in a train, the Reynolds number, and the polymer concentration, and at a given diameter ratio and concentration the angle of separation can be correlated as a function of the Reynolds number. The data substantiate a previous hypothesis by Latto, that the observed drag increase of spheres in a pipeline caused by polymer addition, is due to an increase of the separation angle and therefore an increase in the form or pressure drag.
Latto, B. and Lai, A., "The Separation Angle for Spheres in a Pipeline" (1975). Symposia on Turbulence in Liquids. 32.
4th Biennial Symposium on Turbulence in Liquids (1975: Sep., Rolla, MO)
Chemical and Biochemical Engineering
Article - Conference proceedings
Separated Turbulent Flows
© 1975 University of Missouri--Rolla, All rights reserved.