Apr 2022

Tags: non-Newtonian Flow

The Deborah and Weissenberg numbers

Deborah Number

$$D=\frac{\text{time of relaxation}}{\text{time of observation}}$$

High Deborah numbers, material behaves like a solid. Low Deborah numbers, material behaves like a fluid.

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References

The Deborah and Weissenberg numbers, Robert Poole,The British Society of Rheology - Rheology Bulletin, Vol. 53