Capillary viscometer was designed tool for high pressure and high temperature gas dynamic viscosity. The machine is very easy and safe for handling. Gas were supplied to the capillary tube from a high-pressure reservoir through a pressure regulator unit to maintain a constant flow. In extreme conditions, the capillary tube with high-precision measurements of the pressure drop is the main challenge for this method. Difference between the high pressure up to 100 MPa pressure sensor is not for commercial purposes. Therefore, the exact absolute pressure transducers were used as a pair of differential pressure sensor. Then the pressure drop is calculated by subtracting one from the inlet to the resolution of 100 Pa 100 MPa pressure. The accuracy of this measurement system is confirmed by measuring the viscosity of nitrogen as reference gas. Apparatus for the viscosity of nitrogen from ambient temperature to 500 K, and hydrogen from ambient temperature to 400 K and pressure up to 100 MPa, the maximum deviation is 2.2%, compared with the correlation with authors and REFPROP (NIST).

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Fast, easy, accurate and meaningful: what should be the measurement of viscosity.
Paint & Coatings Industry
Paint & Coatings Industry

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In 2005 August 1, | Beltran, Diane M. | Copyright
Copyright 2009 BNP Media. This material is published under license from the publisher Gale Group, Farmington Hills, Michigan. All inquiries concerning the rights and concerns about the content should be directed to customer service.

There are various ways to assess the architectural paint viscosity: efflux cups, Krebs viscometer with a spindle speed of rotation of the drive spindle viscometer or a cone / plate. All have their advantages and disadvantages. The best measurement procedure will ultimately be one that provides reliable, Pass / Fail method, laboratory technicians and plant personnel can quickly and easily. This article will briefly summarize the viscosity of the test methods used in industry (which in many cases, are all necessary), and to provide information on the proposed two-point test that can give explicit permission / failure of the QC measurements.

Busy QC laboratory, manufacturing floor or in the factory, fast and simple measurement is usually desirable. However, as with most things that are quick and easy, it can be to all of you - not enough detail, only the "go" / "no go" number. Meaningful measurement of ink viscosity goal - to provide evidence that not only tells you if the paint is OK, but also the right to make use of paint, ie, a test that is not too much or most of the time.

Rheogram testing (shear rate ramps) provide useful information about the dependence of fluid shear. But now, we all have come to realize that color, design, shear thinning.