The effect of viscosity on turbulent mixing in a co-flowing jet mixer

Gokul Pathikonda, Mustafa Usta, Cameron Ahmad, Vincent Lee, Irfan Khan, Paul Gillis, Devesh Ranjan, Cyrus Aidun

Research output: Contribution to conferencePaperpeer-review

Abstract

Turbulent shear-driven mixing in a coaxial and co-flowing configuration is studied experimentally and computationally to understand and model the effect of viscosity gradients in the flow field. Two liquids with a large disparity in dynamic viscosity are mixed, with a low viscosity liquid injected as a high-velocity inner jet into a high viscosity co-flowing outer flow. Simultaneous experimental measurements of the velocity and concentration fields are made using high-resolution PIV and PLIF to obtain their turbulent cross-correlation statistics for viscosity ratios of 1 and 40. LES simulations are also performed using various mixture subgrid-scale (SGS) to investigate the effectiveness of the same in predicting the scalar mixing and to complement the experimental observations. We aim to understand the effect viscosity gradients in the flow have on turbulent mixing at high Schmidt (Sc) and Reynolds numbers (Re). The preliminary experimental and computational results already show a stark difference in the flow structure.

Original languageEnglish (US)
StatePublished - 2019
Externally publishedYes
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: Jul 30 2019Aug 2 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
CountryUnited Kingdom
CitySouthampton
Period7/30/198/2/19

ASJC Scopus subject areas

  • Atmospheric Science
  • Aerospace Engineering

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