Flow field measurements using PIV in and around a Cavitating Flow

Flow field measurements using PIV in and around a Cavitating Flow

Daily Supervisors:            Saad Jahangir & Willian Hogendoorn

Supervisor:                        Prof. dr. ir. Christian Poelma (C.Poelma@tudelft.nl)

Description:

Cavitation, defined as the formation of vapor/gas bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor pressure, often commences to vibration and damage of mechanical components [1]. Although the mechanism of cavitation has been subject to research in the field of fluid mechanics for a century, the kinematics and flow dynamics are not fully understood, yet. Recent high-speed observations from TU Delft, performed on a converging-diverging axisymmetric nozzle, indicate two different cavitation mechanisms responsible for the shedding of cavitation clouds [2]. To investigate the flow field in these mechanisms, Particle Image Velocimetry (PIV) needs to be implemented. PIV is an optical method of flow measurement used to obtain instantaneous velocity measurements and related properties in fluids [3]. The application of PIV can give very valuable information about the flow field of cavitation mechanisms.

Approach:

The student will setup the (available) PIV system on the existing cavitation test-rig. In the current MSc project, we will focus on two main research questions: 

  1. change of the flow field by cavitation inception, and
  2. how different cavitation mechanisms influence the flow.

The research project will be conducted in the laboratory of Aero and Hydrodynamics, TU Delft.

References:

  1. J.P. Franc and J. M. Michel. Fundamentals of cavitation. Vol. 76. Springer Science & Business Media, 2006.
  2. S. Jahangir, W. Hogendoorn and C. Poelma. "Dynamics of partial cavitation in an axisymmetric converging-diverging nozzle." International Journal of Multiphase Flow, 106:34-45, 2018.
  3. R.J. Adrian and J. Westerweel. Particle Image Velocimetry. Cambridge University Press, 2011.
A visualisation of partial cavitation in a venturi.

MSc project at P&E - Multiphase Systems

Chair:
Multiphase Systems

Involved People:
prof. dr. ir. C. Poelma
S. Jahangir, M.Sc.
ir. W. Hogendoorn