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SUMMARY:Filtration and fundamental fluid mechanics inspired by the manta r
 ay
DTSTART:20230928T101500
DTEND:20230928T111500
DTSTAMP:20260406T004532Z
UID:63aaa0aef2bfe26fb59c0e8d3119746de22eec236d6e4bddf8bfde0a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Anette (Peko) Hosoi\nABSTRACT :\nHeating\, ventilation\,
  and air conditioning (HVAC) systems account for about 20% of energy consu
 mption in the US of which at least 7% is consumed by fans. In addition\, a
 pproximately 4% of US energy is consumed by the production\, treatment\, a
 nd distribution of water. A key component of the efficiency in all of thes
 e systems is the performance of filters in which reducing resistance can r
 esult in significant energy savings. In this talk\, we will explore novel 
 strategies for filtration inspired by the manta ray which has evolved a sy
 stem for filtering zooplankton that appears to be unlike any filtration me
 chanism previously observed in biological or industrial settings.  Rather
  than adopting a sieve strategy\, the manta deploys microstructures which 
 are hypothesized to instigate eddies that push particles away from the fil
 tration pores\, resisting clogging\, and enabling the filtration of partic
 les much smaller than the pore size. \n\nIn this talk we will examine two
  toy problems that mimic various features of the filtration strategies emp
 loyed by manta rays. In the first\, we examine the effect of microstructur
 es in a "leaky pipe".  In the second we analyze mechanisms that enable pa
 rticles to cross streamlines\, which is an essential component in separati
 ng the flow into particle-rich and particle-free streams. In particular\, 
 it is known that inertial lift forces can lead to particle focusing in cha
 nnel flows\; yet oscillatory straining effects have also been suggested as
  a mechanism for particle focusing in wavy channels. To determine which of
  these two mechanisms dominate\, we decompose the particle-free channel fl
 ow into a primary Poiseuille flow and secondary eddies induced by the wavi
 ness. We calculate the perturbation of the particle on the particle-free f
 low and the resulting lateral lift force exerted on the particle using mat
 ched asymptotics. The interaction between the zeroth-order lift force and 
 the particle-free flow largely determines the focusing locations. We find 
 that experimental data from wavy channels are consistent with the asymptot
 ic predictions of the focusing locations\, which are primarily governed by
  the channel Reynolds number\, the particle size\, and the amplitude of th
 e waviness. \n\nBIO :\nAnette (Peko) Hosoi is a Neil and Jane Pappalardo 
 Professor of Mechanical Engineering at MIT. She received her PhD in Physic
 s from the University of Chicago and went on to become an NSF Postdoctoral
  Fellow in the MIT Department of Mathematics and at the Courant Institute\
 , NYU. She is a leader in the study of the hydrodynamics of thin fluid fil
 ms and in the nonlinear physical interaction of viscous fluids and deforma
 ble interfaces. Her work spans multiple disciplines including physics\, ap
 plied mathematics and biology\, with a focus on optimization of crawling g
 astropods\, swimming microorganisms and soft robotics. Her passion for sp
 orts has led her to create MIT Sports Lab\, a program that is designed to 
 build an interconnected community of faculty\, students\, industry partner
 s\, alums and athletes who are dedicated to applying their technical exper
 tise to advance the state-of-the-art in sports.\n\n 
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/65680035853?pwd=b3FXQ3hYVzg4RnZ5M3JqbFRHMlpJQT09
STATUS:CONFIRMED
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