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Experimental and linear analysis for the instability of non‐ N ewtonian liquid jets issuing from a pressurized vibrating nozzle
Author(s) -
RodríguezRivero Cristina,
Del Valle Eva M. M.,
Galán Miguel A.
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14790
Subject(s) - breakup , viscoelasticity , laminar flow , mechanics , capillary action , instability , wavenumber , viscosity , dispersion (optics) , jet (fluid) , dispersion relation , thermodynamics , materials science , constitutive equation , nozzle , physics , chemistry , optics , finite element method
The laminar capillary breakup of viscoelastic jets to produce polymeric microcapsules is analyzed experimentally and theoretically. The phenomenon is based on subjecting a capillary jet to controlled disturbances so that it eventually breaks up forming individual droplets. A dispersion relation from a temporal linear analysis to describe and predict the system behavior that includes the Oldroyd‐B constitutive equation to take into account the viscoelasticity of the liquid is obtained. Dispersion curves relating growth rate and wavenumber of the perturbed jets are compared with experimental conditions and the chosen mathematical approach is found that fairly describes the system. The obtained dispersion relation eases the study of the effect of viscosity, elasticity, through relaxation times, and flow rate in the system. The approach allows finding the best conditions to obtain homogeneous droplets and describes the system qualitatively. © 2015 American Institute of Chemical Engineers AIChE J , 61: 2070–2078, 2015