- “Everything flows?”: elastic effects on startup flows of yield-stress fluids
- Rheologica Acta
- Volume | Issue number
- 56 | 3
- Pages (from-to)
- Number of pages
- Document type
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
Institute of Physics (IoP)
It is now 30 years since Barnes and Walters published a provocative paper in which they asserted that the yield stress is an experimental artifact. We now know that the situation is far more complicated than understood at the time, and that the mechanics of the solid material prior to yielding must be considered carefully. In this paper, we examine the response of a well-studied “simple” yield-stress material, namely a Carbopol gel that exhibits no thixotropy, and demonstrate the significance of the pre-yielding behavior through a number of elementary measurements.
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