Shape diagram of vesicles in Poiseuille flow.

نویسندگان

  • Gwennou Coupier
  • Alexander Farutin
  • Christophe Minetti
  • Thomas Podgorski
  • Chaouqi Misbah
چکیده

Soft bodies flowing in a channel often exhibit parachutelike shapes usually attributed to an increase of hydrodynamic constraint (viscous stress and/or confinement). We show that the presence of a fluid membrane leads to the reverse phenomenon and build a phase diagram of shapes-which are classified as bullet, croissant, and parachute-in channels of varying aspect ratio. Unexpectedly, shapes are relatively wider in the narrowest direction of the channel. We highlight the role of flow patterns on the membrane in this response to the asymmetry of stress distribution.

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عنوان ژورنال:
  • Physical review letters

دوره 108 17  شماره 

صفحات  -

تاریخ انتشار 2012