Characterisation Of Multiphase Turbulence By Optical Measurements In Refractive Index-Matched System

Coventry University - Centre for Flow Measurement and Fluid Mechanics


Turbulent multiphase flows occur in industrial environments from well fluid in oil fields to flotation cells in water treatment plants which makes characterisation of velocity fields and phase distribution essential for design and optimisation of technological processes.

The main obstacle to optical characterisation of two-phase flows is multiple light scattering by curved interfaces, which makes the medium turbid. In pilot experiments, we have made optical methods such as Particle Image Velocimetry, Planar Laser Induced Fluorescence, and Laser Doppler Anemometry usable by fine matching of phase refractive indices, which involves thermostabilisation with the precision of 0.1 C. Images similar to that shown above have been obtained and used to study the flow structure.

To the date, no reliable measurements of turbulence spectrum and two-phase velocity fields are obtained even in simple configurations such as pipe flow. We will advance index matching as a tool for two-phase flow studies while focussing on characterisation of two-phase turbulence. The project will initiate a new field of applying rigorous Fluid Dynamics optical instruments to quantitative investigation of two-phase flows.



The Flow Measurement and Fluid Mechanics Faculty Research Centre undertakes fundamental and applied research into industrially-relevant complex flows including:

  • Smart Pipes, Vessels and Advanced Sensors
  • Process Tomography and Process Nowcasting
  • Fluid Mechanics of Complex Flows
  • Advanced Computing
  • Clean Combustion
  • Reservoir modelling

Flow measurement is an integral and vital part of many industrial processes. Plant control, product quality and safety systems are often underpinned by the need to measure flows of liquids, gases and solids. Trade of fuels, industrial feedstock and chemical products relies on accurate measurement of flow. Flow measurement is an essential element of all modern industrial societies.



Successful applicants will have:

  • A minimum of a 2:1 first degree in a relevant discipline/subject area with a minimum 60% mark in the Project element or equivalent with a minimum 60% overall module average, or
  • A Masters Degree in a relevant subject area will be considered as an equivalent. The Masters must have been attained with overall marks at merit level (60%). In addition, the dissertation or equivalent element in the Masters must also have been attained with a mark at merit level (60%).
  • The potential to engage in innovative research and to complete the PhD within a prescribed period of study
  • Language proficiency (IELTS overall minimum score of 7.0 with a minimum of 6.5 in each component).


  • The candidate should possess solid background in mathematics and physics which may be tested at the interview
  • The candidate should have some hands-on experience in experiment
  • The candidate should possess some programming skills
  • Knowledge and experience in experimental fluid dynamics and optical measurements is desirable but not essential

Experience with one or more of the following is desirable but not essential: Particle Image Velocimetry, Laser Doppler Anemometry, MATLAB, Computational Fluid Dynamics, measurement automation.

Closing Date: 31st August

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Midlands of England