Efficiency of size-dependent particle separation by pinched flow   fractionation
  Pinched flow fractionation is shown to be an efficient and selective way to quickly separate particles by size in a very polydisperse semi-concentrated suspension. In an effort to optimize the method, we discuss the quantitative influence of the pinching intensity in the balance between the requirements of selectivity and minimal dilution. 
Aparna Srivastav, Thomas Podgorski, Gwennou Coupier
physics.flu-dyn cond-mat.soft