Difference between revisions of "Splitting a Liquid Jet"

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== Summary ==
 
== 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.
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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 ==
 
== Practical Application of Research ==

Revision as of 12:34, 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) 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