Most rotational viscometer specifications promise high test accuracy and repeatability. However, an instrument on its own cannot guarantee accurate results. Instrument set-up and using the right test parameters are critical pieces of the puzzle.
Test parameters and turbulence are two key factors to consider when preparing to test with a rotational viscometer. The spindle, speed setting, and temperature of the product are some of the parameters that can impact test results. Additionally, turbulence in the sample’s flow during a test will distort viscosity readings. Knowing how to manage these two factors can significantly contribute to the accuracy of your testing.
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Topics:
Measure Viscosity,
Viscometers,
Viscosity,
Dynamic Viscosity,
rotational viscometer,
Liquid Properties
You probably know that rotational viscometers work by measuring the torque on a vertical shaft that rotates a spindle. The spindle is in the test sample and its rotation is impeded in proportion to the viscosity of the sample. These instruments measure viscosity.
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Topics:
Viscometers,
Viscosity,
Liquid Properties
Nearly every day we have a question about differences between Viscosity, Consistency and Surface Tension. There is usually a second part of the question;
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Topics:
Viscometers,
Viscosity,
Bostwick Consistometer,
Tensiometer,
Surface Tension Measurement,
Surface Tension,
Liquid Properties
I used to think that liquids were pretty simple things. Is that what you think too?
Not so fast. Let’s take a look at three properties of liquids and see if we change our view.
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Topics:
Newtonian Fluid,
Viscometers,
Viscosity,
Bostwick Consistometer,
Consistency,
duNouy Rings,
Surface Tension Measurement,
Surface Tension,
Liquid Properties
Not Much of a Science Person Learns About Viscosity
Since I joined CSC Scientific in July 2013, I’ve been on a steep learning curve. You see, I’ve never been much of a science person. There was even one particular chemistry class in high school used to give me migraine headaches - routinely.
Having no real background in the sciences means that I’ve had a lot to learn since I joined a company that sells scientific testing equipment. Maybe you’re nodding in sympathy with me right now. Many of our clients – that is, the people doing the purchasing on behalf of their company – are not scientists and don’t have a thorough knowledge of the scientific principles behind the products they’re told to buy.
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Topics:
Newtonian Fluid,
"The Basics",
Viscometers,
Viscosity
You may recall that I promised to offer my interpretation as to how Surface Tension is related to Viscosity.
To begin with, liquid surface tension and viscosity share a common trait: they both involve properties of fluids. After that, things start to get murky.
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Topics:
Wilhelmy Plates,
Viscosity,
duNouy Rings,
Tensiometer,
Surface Tension Measurement,
Surface Tension,
Interfacial Tensiometer,
Liquid Properties