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Experimental and computational studies of water drops falling through model oil with surfactant and subjected to an electric field

Abstract

The behaviour of a single sub-millimetre-size water drop falling through a viscous oil while subjected to an electric field is of fundamental importance to industrial applications such as crude oil electrocoalescers. Detailed studies, both experimental and computational, have been performed previously, but an often challenging issue has been the characterization of the fluids. As numerous authors have noted, it is very difficult to have a perfectly clean water-oil system even for very pure model oils, and the presence of trace chemicals may significantly alter the interface behaviour. In this work, we consider a well-characterized water-oil system where controlled amounts of a surface active agent (Span 80) have been added to the oil. This addition dominates any trace contaminants in the oil, such that the interface behaviour can also be well-characterized. We present the results of experiments and corresponding two-phase-flow simulations of a falling water drop covered in surfactant and subjected to a monopolar square voltage pulse. The results are compared and good agreement is found for surfactant concentrations below the critical micelle concentration.

Category

Academic chapter/article/Conference paper

Client

  • Research Council of Norway (RCN) / 206776

Language

English

Affiliation

  • Norwegian University of Science and Technology
  • SINTEF Energy Research / Elkraftteknologi
  • SINTEF Energy Research / Gassteknologi

Year

2014

Publisher

Curran Associates, Inc.

Book

2014 IEEE 18th International Conference on Dielectric Liquids ICDL

Issue

2014

ISBN

9781479920655

External resources

View this publication at Cristin