Electrohydrodynamic aggregation with vertically inverted systems

Eric D. Ruud, Cari S. Dutcher

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Flow patterns surrounding particles suspended near electrodes within an electrolyte solution can be induced with an electric field due to an electrohydrodynamic (EHD) force. Depending on electrolyte, particle, and field properties, a variety of particle packing and stability states have been observed in EHD flow. In this work, we report evidence of EHD flow-induced aggregation of 2-μm sulfonated latex beads in NaCl and NaOH electrolyte solutions, in inverted particle-electrode orientations. Experimental conditions were chosen to match previous work where aggregation was observed at a bottom electrode. Particles remain stable at the top electrode for times greater than 1 h, and aggregation behavior is quantified in terms of growth rate and particle packing density and order. Similar aggregation behavior is seen at both top and bottom electrodes, with aggregate growth occurring more quickly within NaCl solutions than NaOH solutions at both the bottom and top electrode. In addition, an observed secondary location of stability for the vertical position of particles in NaOH electrolyte at the bottom electrode is not seen at the top electrode. Comparing these metrics to predictions made by a scaling model for EHD flow, particle aggregation behavior is successfully predicted at both top and bottom electrodes, but some of the observed differences in aggregate packing are not. Thus we suggest that modifications to existing models or their interpretation may be needed to improve predictions of the behavior of such systems.
Original languageEnglish (US)
Article number022614
JournalPhysical Review E
Volume97
Issue number2
DOIs
StatePublished - Feb 26 2018

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Electrohydrodynamics
electrohydrodynamics
Electrode
Aggregation
electrodes
Electrolyte
electrolytes
Packing
Prediction
packing density
Flow Pattern
latex
predictions
beads
Electric Field
flow distribution
Vertical
Scaling
scaling
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Electrohydrodynamic aggregation with vertically inverted systems. / Ruud, Eric D.; Dutcher, Cari S.

In: Physical Review E, Vol. 97, No. 2, 022614, 26.02.2018.

Research output: Contribution to journalArticle

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