Validation of Les Predictions for Turbulent Flow in a Confined Impinging Jet Reactor

نویسندگان

  • Matteo ICARDI
  • Emmanuela GAVI
  • Daniele L. MARCHISIO
  • Michael G. OLSEN
  • Rodney O. FOX
  • Djamel LAKEHAL
چکیده

This work focuses on the prediction of turbulent flow in a Confined Impinging Jet Reactor using Large Eddy Simulation (LES). Three dimensional transient simulations were performed for various flow rates, ranging from quasi-steady laminar flow to unsteady turbulent flow. Predictions of the mean and fluctuating velocities were compared with micro Particle Image Velocimetry (mPIV) data. Good agreement was found both for the mean velocity components and the fluctuations. The study highlights the importance of properly imposing the inflow boundary conditions to mimic the pumping instability, without which the CFD model does not reproduce the correct unsteady flow behavior. As the Reynolds number range was still low to moderate, the sub-grid scale modeling was not an issue here and the small scales were of less importance, as long as scalar transport and chemical reaction are not in play. An important finding is the good prediction of the high velocity fluctuations due to the natural instability of the system strongly enforced by the jets asymmetry and unsteadiness.

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تاریخ انتشار 2009