Difference between revisions of "Splitting a Liquid Jet"

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dominant balance, liquid jet splitting, Navier Stokes
 
dominant balance, liquid jet splitting, Navier Stokes
  
[[Image:Paruchuri1.jpg|300px|thumb|right|Figure 1.  (a) Schematic showing a jet passing between a forcing element that cause the jet to split into two filaments.  (b) Coordinate system for analysis.  The analysis will focus on finding the evolution of the thickness h(x,t) of the jet cross section.]]
+
[[Image:Paruchuri1.jpg|300px|thumb|right|Figure 1.  (a) Schematic showing a jet passing between a forcing element that cause the jet to split into two filaments.  (b) Coordinate system for analysis.  The analysis will focus on finding the evolution of the thickness h(x) of the jet cross section.]]
[[Image:Paruchuri2.jpg|300px|thumb|right|Figure 2.  (a) and (b) show two options for the arrangement of atoms in a 13-atom cluster.]]
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[[Image:Paruchuri2.jpg|300px|thumb|right|Figure 2.  (a) Time evolution of the jet thickness, h(x).  (b) Time evolution of the jet velocity, v(x).  The inset plots show the minimum thickness vanishes as <math>h_{min} ~ (t^*-t)^2</math>]]
 
[[Image:Paruchuri3.jpg|300px|thumb|right|Figure 3.  (a) and (b) show two options for the arrangement of atoms in a 13-atom cluster.]]
 
[[Image:Paruchuri3.jpg|300px|thumb|right|Figure 3.  (a) and (b) show two options for the arrangement of atoms in a 13-atom cluster.]]
  

Revision as of 20:59, 17 March 2009

"Splitting of a Liquid Jet"
Srinivas Paruchuri and Michael P. Brenner
Physical Review Letters 98(13) 134502 (2007)


Soft Matter Keywords

dominant balance, liquid jet splitting, Navier Stokes

Figure 1. (a) Schematic showing a jet passing between a forcing element that cause the jet to split into two filaments. (b) Coordinate system for analysis. The analysis will focus on finding the evolution of the thickness h(x) of the jet cross section.
Figure 2. (a) Time evolution of the jet thickness, h(x). (b) Time evolution of the jet velocity, v(x). The inset plots show the minimum thickness vanishes as <math>h_{min} ~ (t^*-t)^2</math>
Figure 3. (a) and (b) show two options for the arrangement of atoms in a 13-atom cluster.

Summary

Paruchuri and Brenner develop a theoretical explanation for the splitting of a circular cross section liquid jet into two separate filaments. Beginning from Navier Stokes in the limit that jet cross section changes slowly as it moves downstream from the nozzle, they demonstrate that only when sufficiently large tangential stresses are present does the jet split. A full numerical simulation is compared to analytical approximations with full agreement. Looking at the simulation results, the authors find that there are three distinct regions as one passes from the center of the jet to the outside: 1) a lamellar region characterized by a flat thickness profile and linear velocity field, 2) an outer region characterized by a nearly time independent thickness and velocity, and 3) a jump region with a large jump in the velocity field connecting the lamellar and outer regions. Dominant force balances for these regions are proposed and tested against simulation.

Practical Application of Research

in process

Mechanism for Splitting Events

yep



[1] if necessary


written by Donald Aubrecht