Last week, we hosted a webinar on the Weissenberg-Rabinowitsch-Mooney Correction, also known as WRM correction. What is this correction? When you are using a viscometer to measure viscosity of a liquid, there is more than just one number that comes out. Using a viscometer, you can determine if your sample is Newtonian or non-Newtonian.
We are happy to announce a new application note written by our very own, Research Scientist, Dr. Zachary Imam.
Most fluids are non-Newtonian. What that means is that as the sample is exposed to shear rates, the viscosity can change (increase or decrease). Some samples display Newtonian behavior until a certain shear rate point where it changes the viscosity so it's imperative to be aware of all possibilities and expand your testing capabilities as wide as possible so you are prepared for all unknown.
When measuring non-Newtonian samples on rheometers and viscometers, such solutions often violate the assumptions programmed into the instrumentation. Diving deeper, the assumption that the change in shear stress over shear rate is linear would then be violated. However, there is a way to work with non-Newtonian samples in such cases by using the Weissenberg-Rabinowitsch-Mooney Correction (WRM).
The requested recording and presentation slides are ready to access from our webinar hosted by guest speaker, Dr. Gregory Sloop last week!
The viscosity of blood influences at least three variables: its ability to clot, perfuse tissue, and vascular resistance. An abnormally high blood viscosity can be an indicator of underlying health issues and a predictor of adverse events such as the following:
The vast majority of fluids in the world exhibit non-Newtonian behavior. So, knowing how to measure, correct, and handle non-Newtonian rheological data is vital for performing accurate and repeatable experiments and data analysis.
This application note will step through the commonly used Weissenberg-Rabinowitsch-Mooney (WRM) shear rate correction for non-Newtonian fluids, that way future experiments and data analysis can be done with peace of mind!
We have released a new application note on low viscosity fluids specifically by using an assortment of colognes.
Viscosity data for different colognes were obtained using microVISC™. Over the shear rates explored, 200 to 5,100 1/s, the colognes exhibited Newtonian behavior.
The viscosity of these colognes was found to be between 1.72 and 2.12 mPa-s. The primary ingredient was alcohol, but there were still up to a 20 % difference in the viscosity between the highest and lowest viscosity samples.
This result shows that formulations with similar base ingredients can still have a wide range of viscosities based on the other components of the formulation.
I recently got a great question from our customers on how to measure zero shear viscosity with RheoSense viscometers. It is a fairly common misconception so I wanted to cover what zero shear viscosity.
Our record sign up and attended webinar is now up and ready for download! Access the full recording and also the presentation.