Open AccessDetermination of dynamic surface tension and viscosity of non-Newtonian fluids from drop oscillations
Author(s) -
Lisong Yang,
Bethany Kate Kazmierski,
Stephen D. Hoath,
Sungjune Jung,
WenKai Hsiao,
Yiwei Wang,
Arganthaël Berson,
Oliver G. Harlen,
Nikil Kapur,
Colin D. Bain
Publication year - 2014
Publication title -
physics of fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.188
H-Index - 180
eISSN - 1089-7666
pISSN - 1070-6631
DOI - 10.1063/1.4901823
Subject(s) - surface tension , drop (telecommunication) , newtonian fluid , viscosity , physics , viscoelasticity , mechanics , shear thinning , non newtonian fluid , shear (geology) , thermodynamics , composite material , materials science , telecommunications , computer science
The oscillations of free-falling drops with size range from pl to μl have been used to measure the transient shear viscosity and the dynamic surface tension of shear-thinning fluids on the timescale of 10−5–10−2 s. The method is first validated with Newtonian fluids. For a given surface tension, the lower and upper limits for accurate measurement of the viscosity are determined as a function of drop size. The dynamic properties of two types of shear-thinning fluids with varying viscoelasticity are reported: aqueous suspensions of the antifungal drug griseofulvin and of the organic light-emitting diode material poly(3,4-ethylenedioxythiophene): polystyrene-sulphonate. In both cases, the free-falling drop retains the high-shear viscosity.
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