Effect of temperature on shear thickening fluid rheology
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Shear thickening fluids consist of a particulate disperse phase suspended in a continuous liquid phase and experience a dramatic rise in viscosity at a critical shear rate. In this work, the effect of temperature on the critical shear rate was investigated for four STFs, where the disperse phase mass fraction, continuous phase molecular weight, and disperse phase surface chemistry were varied. The STFs were 0.15 mass fraction (MF) Aerosil 200 fumed silica (A200) in polyethylene glycol of molecular weight of 200 (PEG 200), 0.225 MF A200 in PEG 200, 0.15 MF A200 in polyethylene glycol of molecular weight of 400, and 0.15 MF Aerosil R812 fumed silica in polypropylene glycol of molecular weight of 700. Steady shear rheological experiments were conducted at multiple temperatures for each STF. Over a range of temperatures the critical shear rate for each STF was found to scale inversely with continuous phase viscosity.
author list (cited authors)
Warren, J., Kundu, S., Offenberger, S., Lacy, T., Toghiani, H., & Pittman, C. U.