A probe capillary viscometer

Thomas, H. W.; Janes, D E; Barnes, Howard A.

doi:10.1088/0022-3735/1/8/319

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Cited by 2 publications

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“…Nevertheless, the Hagen-Poiseuille law is used to approximate the flow rate for a suitable mathematical model. [3][4][5][6][7][8] The validity of this approach has been analyzed in several reports. [10][11][12][13] In particular, for gravity flow type capillary viscometers, 3 it has been shown 12 that the time during which the transient flow attains a Poiseuille character is very short, and for practical purposes Eq.…”

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confidence: 99%

Pressure-driven capillary viscometer: Fundamental challenges in transient flow viscometry

Digilov

2011

Review of Scientific Instruments

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We describe an unsteady pressure-driven capillary viscometer, in which the liquid under test is forced through a capillary tube by compressed-air pressure. The principle of operation involves measurement of the driving pressure versus time that decays progressively as the fluid flows and covers continuously a broad shear rate range in a single measurement. The viscosity is determined by curve fitting of the experimental data to the explicit expression for the transient pressure as a function of time. A laboratory bench test shows the validity of the theoretical approach for viscosity determination of both Newtonian and non-Newtonian liquids.

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