BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Experimental study of turbulent multiphase flows: inertial particl
 es\, collisions and bubble dynamics - Alberto Aliseda\, University of Wash
 ington
DTSTART:20140425T150000Z
DTEND:20140425T160000Z
UID:TALK52222@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:Turbulent multiphase flows encompass some of the biggest open 
 questions in modern fluid mechanics. The dynamics of solid particles\, liq
 uid droplets and gas bubbles represent significant gaps in our fundamental
  understanding\, while at the same time\, being of great relevance in many
  industrial and environmental applications. There are multiple examples of
  the relevance of these problems\, but I will focus on the formation of ra
 in in warm clouds as a classical example where the poor basic understandin
 g hinders progress in accurate modeling and prediction of the underlying g
 eophysical\, or engineering\, process. I will discuss laboratory experimen
 ts in which we probe the inertial effects in the dynamics of heavy particl
 es in a homogeneous isotropic turbulent flow. The interaction of the inert
 ial particles with the turbulent vortical structures results in accumulati
 on of droplets in regions of high strain and the modification of the drift
  velocity of droplets due to gravity. Both of these effects lead to a high
 er probability of collisions due to smaller inter-droplet distance and hig
 her relative velocities. I will also describe results for the same problem
  at the opposite side of the density ratio spectrum: The dynamics of bubbl
 es in turbulent flows. I will conclude with a brief description of a new s
 tudy to understand the behaviour of microbubbles under the effect of shear
  and ultrasound-induced forces.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
END:VEVENT
END:VCALENDAR