Kinetics of Coarsening and Precipitation of Dilute Polymer Solutions:  Fluorescence Study of PEO in Toluene

2002 ◽  
Vol 35 (16) ◽  
pp. 6397-6403 ◽  
Author(s):  
Susana Piçarra ◽  
Eduardo J. N. Pereira ◽  
E. N. Bodunov ◽  
J. M. G. Martinho
Keyword(s):  
Polymer Solutions ◽  
Fluorescence Study ◽  
Dilute Polymer Solutions ◽  
Kinetics Of

scholarly journals ‘Gobbling drops’: the jetting–dripping transition in flows of polymer solutions

2009 ◽  
Vol 636 ◽  
pp. 5-40 ◽  
Author(s):  
C. CLASEN ◽  
J. BICO ◽  
V. M. ENTOV ◽  
G. H. McKINLEY
Keyword(s):  
High Speed ◽  
Polymer Solutions ◽  
Underlying Mechanism ◽  
Inertial Forces ◽  
Dilute Polymer Solutions ◽  
Periodic Growth ◽  
Drop Detachment ◽  
Capillary Jets ◽  
Thinning Process ◽  
Kinetics Of

This paper discusses the breakup of capillary jets of dilute polymer solutions and the dynamics associated with the transition from dripping to jetting. High-speed digital video imaging reveals a new scenario of transition and breakup via periodic growth and detachment of large terminal drops. The underlying mechanism is discussed and a basic theory for the mechanism of breakup is also presented. The dynamics of the terminal drop growth and trajectory prove to be governed primarily by mass and momentum balances involving capillary, gravity and inertial forces, whilst the drop detachment event is controlled by the kinetics of the thinning process in the viscoelastic ligaments that connect the drops. This thinning process of the ligaments that are subjected to a constant axial force is driven by surface tension and resisted by the viscoelasticity of the dissolved polymeric molecules. Analysis of this transition provides a new experimental method to probe the rheological properties of solutions when minute concentrations of macromolecules have been added.

On the mechanism of drag reduction in dilute polymer solutions

1996 ◽  
Vol 55 (4) ◽  
pp. 289-295 ◽  
Author(s):  
K. Hoyer ◽  
A. Gyr ◽  
A. Tsinober
Keyword(s):  
Drag Reduction ◽  
Polymer Solutions ◽  
Dilute Polymer Solutions
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