a hysteresis of the viscosity as a function of temperature can occur in some cases of nanofluids measurement; What are the rheological changes that can cause this phenomenon ?
Alan Parker
Aggregation/Disaggregation of the nnaoparticles is the most obvious answer to me. If it is correct then either:
1) The nanoparticles are initially well dispersed and temperature change causes aggregation, leading to a viscosity increase. Or:
1) The nanoparticles are initially aggregated and temperature change causes disaggregation, leading to a viscosity decrease.
Your question is not very specific, so I'm sure other answers are possible.
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