This presentation will outline research which has been carried out in the field of polymer rheology. A number of unexpected phenomena have been observed which are important in many fields of science and technology.
We shall look specifically at phenomena dealing with:
- yield stress measurements in multiphase systems. In particular, we shall discuss our new slotted plate technique to determine yield stress values as low as 10-4 Pa without extrapolation. That is: we achieve an improvement of several orders of magnitude over the vane technique, making our plate technique suitable for yield stress determinations of colloidal and nano suspensions.
- bubble dynamics in viscoelastic media. Here we shall discuss our contribution towards the solution of the velocity jump discontinuity observed occasionally ( since the late sixties) when plotting bubble velocity versus bubble volume. Gas-liquid systems are ubiquitous in industrial practice and understanding bubble behavior in complex fluids is rather important.
- stress jump. We will discuss modified network model predictions of the instantaneous gain or loss of stress on startup or cessation of flow.
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