Viscosity Measurements of Liquids by Capillary Viscometer with a Measuring Needle
Abstract
The use of a capillary viscometer with a measuring needle as working medium providing accurate viscosity measurements of small volume of low transparent liquids is discussed. Operating principle of the viscometer is described. A working formula of the viscometer is derived proceeding from Stokes equation. Presented results of water viscosity measurements in a range of 25 - 70°C match the referenced data. Pressure distribution over the perimeter of the perpendicular section of working medium (cylindrical needle) is analyzed as a function of the needle shift from central position on a capillary axis. Self-focusing mechanism of the measurement system is demonstrated.
About the Authors
K. S. Merzlyakov
Пермский национальный исследовательский политехнический университет
Russian Federation
Russian Federation
S. I. Shtin
Пермский национальный исследовательский политехнический университет
Russian Federation
Russian Federation
N. P. Uglev
Пермский национальный исследовательский политехнический университет
Russian Federation
Russian Federation
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Review
For citations:
Merzlyakov K.S., Shtin S.I., Uglev N.P. Viscosity Measurements of Liquids by Capillary Viscometer with a Measuring Needle. Industrial laboratory. Diagnostics of materials. 2016;82(10):37-38. (In Russ.)
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