On-line viscosity measurement system
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United States of America Patent
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Mar 6, 2001
Grant Date -
N/A
app pub date -
Mar 12, 1998
filing date -
Mar 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method and apparatus for determining fluid viscosity comprises conveying substantially fully developed, uni-directional, and undisturbed fluid flow through a differential pressure measurement section and flow rate measuring means connected in line with, but separated from, the differential pressure measurement section. A preceding flow tube section is connected to the inlet of the differential pressure measurement section, and a succeeding flow tube section is connected to the outlet of the differential pressure measurement section so that entrance and exit flow effects are avoided in the measurement section. Differential pressure measured in substantially undisturbed, uni-directional, and fully developed fluid flow results in improved accuracy of viscosity calculation using the Hagen-Poiseuille equation.
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