5 papers
Expansion of a hole in a viscoelastic liquid sheet
Tachin Ruangkriengsin, Rodolfo Brandão, Howard A. Stone
Experiments on highly viscous polymeric films show that punctured holes expand exponentially in time, without sustained accumulation of liquid near the rim. This response departs f…
Autophoresis of a Janus particle near a planar wall: a lubrication limit
Tachin Ruangkriengsin, Günther Turk, Günther Turk +1
We study the self-diffusiophoresis of a spherical chemically active particle near a planar, impermeable wall, with a focus on the influence of particle orientation on propulsion. W…
Revealing Actual Viscoelastic Relaxation Times in Capillary Breakup
Nan Hu, Jonghyun Hwang, Tachin Ruangkriengsin +1
We use experiments and theory to elucidate the size effect in capillary breakup rheometry, where pre-stretching in the visco-capillary stage causes the apparent relaxation time to…
Transient rod-climbing in an Oldroyd-B fluid
Tachin Ruangkriengsin, Rodolfo Brandão, Katie Wu +3
The Weissenberg effect, or rod-climbing phenomenon, occurs in non-Newtonian fluids where the fluid interface ascends along a rotating rod. Despite its prominence, theoretical insig…
Viscoelastic fluid flow in a slowly varying planar contraction: the role of finite extensibility on the pressure drop
Bimalendu Mahapatra, Tachin Ruangkriengsin, Howard A. Stone +1
We analyze the steady viscoelastic fluid flow in slowly varying contracting channels of arbitrary shape and present a theory based on the lubrication approximation for calculating…