Brookfield DV2+Pro Viscometer - Manual (Page 56)

Brookfield Engineering Labs., Inc. Page 56 Manual No. M03-165-F0612
Figure V1-13: Custom Screen
V1.3 Math Models
Note: Some or all of these models are available in Wingather or Rheocalc.
Math models provide parameters that indicate how materials will behave in various circumstances
where shear stress and shear rate vary. The data and calculated model parameters can be used
to help QC and R&D characterize how a product will behave for the customer and how it will
behave during processing.
When selecting a math model, it is important to take into consideration the parameters that need
to be measured, as well as, the confidence of fit (CoF). A CoF above 98 is recommended. This
appendix discusses the parameters of the following four models, what kinds of materials they
should be used with, and provides an example of each. All models discussed are available with
Brookfield’s Rheocalc™, Wingather™, and RHEO 3000™ software.
• Power Law (Ostwald)
• Herschel-Bulkley
• Bingham
• Casson
In addition to the above models, this appendix also briefly covers the NCA/CMA Casson model
and the IPC Paste Model. These can be found at the end of this section.