Anika Jain (email): I am a 5th year PhD student in Chemical Engineering department at Stanford. I am a graduate student in Professor Eric Shaqfeh's group, and I study rheology of rigid particle suspensions in dilute polymer solutions using time-dependent 3D simulations. Transient response of viscoelastic suspensions is of great practical and fundamental interest because typically it takes 10-100 strains to achieve steady state and it is difficult to achieve such large strains in practical applications. I have used computational tools to understand the extensional rheology of viscoelastic suspensions by calculating the renormalized particle contribution to the extensional viscosity in the dilute limit over a wide range of extensional Weissenberg numbers and Hencky strain. I have also performed transient simulations and experiments to study the start-up of shear flow of viscoelastic suspensions for particle volume fractions up to 10%. I obtained my bachelor's and master's degree in Chemical Engineering from Indian Institute of Technology, Kanpur in India. I studied the role of inertia and thixotropy in start-up flows of aging soft materials to understand shear banding in rate-controlled flows during my masters.

Talk details: Transient shear rheology of rigid particle suspensions in dilute polymer solutions
Previous studies on rheology of suspensions in dilute polymer solutions have focused on steady shear measurements both in numerical simulations and experiments. In this work, I present the time-dependent evolution of the average shear stress in such suspensions using complete 3D numerical simulations and experiments for particle volume fractions up to 10%.