Abstract
We present a systematic rheological study on the fumed silica suspensions to understand the effect of particle and fluid parameters on the critical shear rate and shear thickening ratio. It was observed that removal of air bubbles and water contamination is crucial to prepare good shear thickening fluids. A careful sample preparation method was adopted to properly disperse the fumed silica particles in polyethylene glycol solution, and we achieved discontinuous shear thickening at low particle concentration. It was observed that the critical shear rate in shear thickening suspension is strongly influenced by both carrier fluid and particle concentration. However, the shear thickening ratio is mainly influenced by the particle parameters and the frictional forces between the particles. Increasing the amount of smaller particles in the suspension significantly decreases the maximum viscosity and shifts the onset of shear thickening to higher values of critical shear rates with much smaller shear thickening ratio. Further, a possible mechanism has been proposed based on the influence of carrier fluid and particle size distribution to explain the rheological behaviour of shear thickening suspension. Our study supports the theory of particle-particle frictional contacts as the main reason for the discontinuous shear thickening.
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Acknowledgments
The authors would also like to thank Nilay Kumar Shahi and Sachin Shrestha for their assistance in conducting the experiments.
Funding
The authors would like to thank the Defence Research and Development Organization, Government of India (Project no. ARMREB/CDSW/2016/175) for their financial support of the research work.
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Prabhu, T.A., Singh, A. Effect of carrier fluid and particle size distribution on the rheology of shear thickening suspensions. Rheol Acta 60, 107–118 (2021). https://doi.org/10.1007/s00397-021-01257-5
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DOI: https://doi.org/10.1007/s00397-021-01257-5