Howard Stone– Boeing Colloquia 4/13 4 pm, SMI 120

Dear Colleagues,

I am pleased to invite you to the Applied Math Department’s Boeing Distinguished Colloquium delivered by Howard Stone, Chair of the Mechanical and Aerospace Engineering Department at Princeton. The title and abstract are given below.

What: Howard Stone, Boeing Distinguished Colloquium
When: Thursday, April 13, 2017 at 4 PM
Where: Smith Hall 120

The talk will be followed by a reception in the Lewis hall lounge. If you are interested in meeting with Prof. Stone, please sign up here. There are a limited number of slots available.

Title: Surprises in the Fluid Dynamics of Flows in Simple Geometries

Abstract: The flow of particle-laden fluids occurs widely, including bulk flows at low or high Reynolds numbers, which arise in all manners of applications. We give a few examples of our current work in this area. First, we consider flow in a T-junction, which is perhaps the most common element in many piping systems. The flows are laminar but have high Reynolds numbers, typically Re=100-1000. It seems obvious that
any particles in the fluid that enter the T-junction will leave following one of the two main outlet flow channels. Nevertheless, we report experiments that document that bubbles and other low-density objects can be trapped at the bifurcation. The trapping leads to the steady accumulation of bubbles that can form stable chain-like aggregates in the presence, for example, of surfactants, or give rise to growth due to coalescence. Our three-dimensional numerical simulations rationalize the mechanism behind this surprising phenomenon. Second, we consider low Reynolds number flows in channels and porous systems with dead-end pores. We document how salt gradients, via a mechanism referred to as diffusiophoresis, can remove particles from dead-end pores or deliver particles into such pores. The transport can be size dependent and we
explore the phenomenon using experiments and modeling. We suggest how the mechanistic ideas can be used to design processes for cleaning water in energy efficient ways.



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