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Effect of a homogeneous magnetic field on the electrospraying characteristics of sulfolane ferrofluids

Published online by Cambridge University Press:  06 November 2017

Aaron Madden ,
Juan Fernandez de la Mora Open the ORCID record for Juan Fernandez de la Mora [Opens in a new window] ,
Nirmesh Jain ,
Hadi Sabouri  and
Brian Hawkett
Aaron Madden
Affiliation:
Mechanical Engineering Department, Yale University, New Haven, CT 06520-8286, USA
Juan Fernandez de la Mora
Affiliation:
Mechanical Engineering Department, Yale University, New Haven, CT 06520-8286, USA
Nirmesh Jain
Affiliation:
Key Centre for Polymers and Colloids, Chemistry Department, The University of Sydney, NSW 2006, Australia
Hadi Sabouri
Affiliation:
Key Centre for Polymers and Colloids, Chemistry Department, The University of Sydney, NSW 2006, Australia
Brian Hawkett
Affiliation:
Key Centre for Polymers and Colloids, Chemistry Department, The University of Sydney, NSW 2006, Australia
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Abstract

We explore the effect of an applied homogeneous magnetic field on the electrospraying characteristics of a ferrofluid in the cone-jet mode. A sulfolane-based ferrofluid mixed with the ionic liquid ethyl ammonium nitrate has been synthesized. These mixtures have negligible volatility under ambient conditions and remain stable under a very wide range of electrical conductivities $K$. Magnetized Taylor cones spray with the same current emission characteristics as their non-magnetized counterparts in the shared voltage and flow rate parameter space. However, the magnetized Taylor cones studied remained stable at voltages 23 % lower than the non-magnetized spray; they also access flow rates 30 % and 40 % lower in ferrofluids with $K=0.3$ and $0.01~\text{S}~\text{m}^{-1}$. In the lower voltage ranges available only to magnetized tips, unusually long stable cones are observed. The magnetic stabilization mechanism responsible for these two effects remains unclear. It is noteworthy that these strong effects arise even when the tip curvature of the strictly magnetized liquid is orders of magnitude smaller than that for the strictly electrified liquid.

JFM classification

Drops and Bubbles: Drops and Bubbles Drops and Bubbles: Electrohydrodynamic effects Complex Fluids: Suspensions
Type
Papers
Information
Journal of Fluid Mechanics , Volume 833 , 25 December 2017 , pp. 430 - 444
Copyright
© 2017 Cambridge University Press 

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