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VISCOSITY FORUM: Ask the experts

How do you test construction materials for “flowability”?

Measuring Viscosity? Kinematic or Dynamic Method. How to Choose?

11/21/13 at 11am EST

An Interview With Pat Maggi

Capillary and rotational viscometers are used around the world to measure viscosity. Why are there two different methods? Does each have certain advantages that recommend its use for certain categories of materials? This interview will review various test methods that encompass one or the other technique and provide guidance on how best to proceed when in doubt on the choice. read more

How do you test construction materials for “flowability”?

How do you test construction materials for “flowability”?

11/6/13 at 11am EST

Dr. Guy Rosenthal Interview

How do you test construction materials for “flowability”? For example, when you open a tub of joint compound, does it have the right consistency? Do you know right away when you stick your trowel in? Or is the proof of the pudding in how it spreads? read more

Life Below the Yield

Viscometer vs. Texture Analyzer

10/23/12

An Interview with Ross Clark

When does a viscometer make sense and when does a texture analyzer make sense? read more

 

BROOKFIELD RESPONDS: Q+A

10/2014

CUSTOMER CHALLENGE: The expression “spindle geometry” is used when talking about viscosity test methods. What does it mean?

BROOKFIELD ANSWERS:

The shape and size of the spindle are the points of information that describe spindle geometry.

The most popular spindle in use by Quality Control Departments is the disc spindle. The disc located near the bottom of the spindle is the reason for the name. The geometry consists of the spindle shaft which is a cylindrical rod and the disc. Different diameter and thickness values characterize the variety of disc spindles that are available. In general, the smaller discs are used to measure higher viscosity materials, while the larger discs are used to measure low viscosity materials.

Other spindle geometries include cylinders, cones, plates, T-bars, spiral spindles, vanes, and more.

The Brookfield publication “More Solutions To Sticky Problems” provides the detailed geometry information on each spindle type.

06/2014

CUSTOMER CHALLENGE: We are considering the possibility of using a process viscometer to measure the viscosity of material going to our fill tank where it is stored temporarily before final packaging. The benefit is the “real time” confirmation that our viscosity is in spec. Grab sample measurements by the QC Lab have served us well, but turnaround time for getting viscosity results back are sometimes longer than we like.
There appear to be different types of process viscometers and we are not sure which one is best for us. Some use a rotating spindle in the fluid stream while others use a vibrating element. What’s the difference? Is one better than the other?

BROOKFIELD ANSWERS:

Viscosity is determined specifically by shearing action. When measured in the lab by a bench top rheometer or viscometer, the “flow curve” for a material shows how the viscosity changes with different shear rates. Most materials exhibit “shear thinning” behavior, which means that viscosity decreases as shear rate increases. Once you have the “flow curve” for a material, you can decide whether there is a specific shear rate that has particular interest.

If the answer is yes, then you will probably decide to choose the process viscometer with rotating spindle. If the answer is no, then the process viscometer with vibrating element will be sufficient. The benefit of the latter choice is a less expensive instrument that is also smaller in size and therefore easier to install.

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VISCOSITY OF WATER TABLE

View the viscosity of water at temperatures between 0 - 100° C.

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VISCOSITY OF MATERIALS TABLE

Instant view of some dynamic viscosities of Newtonian fluids.

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VISCOSITY CALCULATOR

The cup to viscosity conversion engine assumes fluid is Newtonian.

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YIELD STRESS VALUES

Examples of values for typical food and personal care products

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