Rishabh More (email | web): I am a final-year Ph.D. student working with Prof. Arezoo Ardekani. I joined Purdue University in 2017 after completing my undergraduate from IIT Bombay in India. Currently, I am the 2021 Lambert fellow and instructing the undergraduate introductory fluid mechanics to juniors at Purdue. My research is in the field of fluid dynamics with a focus on complex fluids. I do scientific computing, numerical modeling, and experiments to investigate various phenomena such as the rheology of suspensions, the motion of particles/microorganisms through stratified fluids, and heterogeneities in therapeutic samples. When I am not working, I like to cook, brew beer, read, listen to music and exercise.
Talk details: Unifying disparate rate-dependent rheological regimes in non-Brownian suspensions
Suspensions of particles in fluid media are ubiquitous in nature and industry. With the help of numerical simulations, we show that the transitions between dominant force scales in the suspension with increasing the shear rate results in the rate-dependent viscosity in suspensions. The first experimental evidence for this behavior was reported as early as 1972, but still, there is no general theory that can capture the complex shear rate-dependent flow behavior in non-Brownian suspensions. Our work resolves this decades-old problem in the rheology of non-Brownian suspensions by providing a unifying mechanism to capture all the rate-dependent regimes and the corresponding transitions observed for non-Brownian suspensions.