Design and evaluation of a new body for falling cylinder viscometers

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Abstract
A new body with stabilizers removed from the cylindrical section was designed for falling cylinder viscometers. Experimental data to evaluate the new body were obtained with gases and liquids at varying temperatures and pressures.Experimental results showed improved agreement with a theoretical model that assumes laminar flow friction along the cylindrical portion of the body and negligible additional frictional effects. Effects of temperature and pressure were accurately predicted by this theoretical model. The data were correlated on an improved viscometer plot.The advantage of the new body design was a negligible frictional effect of the stabilizers. The entrance‐exit frictional effect was evaluated from the experimental data and correlated on a friction factor plot. Fluid flow in the annulus remained laminar throughout this study. The results of this investigation allow an improved prediction of the falling‐cylinder viscometer constant.