Identification of a previously undetected source of systematic error in capillary viscometry measurements.
A new analysis of the factors affecting the driving head within a capillary viscometer has identified a previously undetected source of error due to surface tension. In contrast to the well-known capillary rise correction to the effective driving head, this additional effect requires that a correction be made to the apparent head of liquid. Calculations show that this source of error may be responsible for deviations in experimental results as large as 1%. A new calibration equation which compensates for both surface tension effects is recommended.
Wedlake
G D
GD
Department of Chemical Engineering, University of Alberta, Edmonton, Alberta T6G 2G6 CanadaDepartment of Chemical Engineering, McGill University, Montreal, Quebec H3A 2A7 Canada.
Vera
J H
JH
Ratcliff
G A
GA