Weakening or losing of surfactant drag reduction ability : A coarse-grained molecular dynamics study

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Fei Liu
  • Dongjie Liu
  • Wenjing Zhou
  • Fei Chen
  • Jinjia Wei

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number115610
Journal / PublicationChemical Engineering Science
Volume219
Online published2 Mar 2020
Publication statusPublished - 29 Jun 2020

Abstract

Surfactant drag reduction has wide applications in energy power and chemical industries. However, the drag reduction ability will be weakened or lost during long-term applications. We studied the surfactant drag reduction in turbulent pipe flow using coarse-grained molecular dynamics simulations and cryogenic transmission electron microscopy experiments. The results show that the weakening/loss of surfactant drag reduction ability occurs under the following conditions: weak alkalinity of the solution, tiny rust particles in the solution, and/or the rusty wall of the pipeline. Weak alkalinity conduces to irregular structures of surfactant micelles, charged tiny iron rust particles can adsorb the surfactant micelles and fill into micelle network gaps, and the rusty wall could adsorb part of the surfactant micelles and lessen the global micelle network structure. All the three can destroy the micelle network structure and result in partial or complete failure of the turbulent drag reduction.

Research Area(s)

  • Coarse-grained molecular dynamics simulation, Martini force field, Surfactant drag reduction ability, Surfactant micelles, Weakening or losing