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The drag and pressure drops for hydrodynamically suspended cylinders in a vertical tube with and without polymer addition
Author(s) -
Lee S. W.,
Latto B.
Publication year - 1978
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450560306
Subject(s) - drag , tube (container) , mechanics , materials science , pressure drop , polymer , geology , composite material , physics
The pressure drops and the suspension velocities for hydrodynamically suspended aluminum and steel cylindrical bodies were measured for a range of aspect ratios (L/d) in a 5 cm vertical plexiglass tube. Four different body‐to‐tube diameter ratios (d/D) from 0.432 to 0.864 were investigated. Both water and drag reducing aqueous polymer solutions of Reten 423 * having concentrations in the range 20 to 100 ppm by weight were used. In all cases, the addition of polymer reduced the drag coefficient and the drag coefficient per aspect ratio approached a constant value as (L/d) approaches 14. The available data for cylindrical bodies in vertical pipelines were correlated to obtain semi‐empirical equations relating pressure drops, drag coefficients and suspension velocities.