TITLE : TURBULENT IMPINGING ROUND JET WITH HEAT TRANSFER

BY : CHAM Development Team - M R Malin

FOR : PHOENICS Validation of Turbulence Modelling Options

DETAILS :

• Single axisymmetric turbulent jet impinging onto a slightly- heated plane surface.
• Jet Reynolds number is 70,000 & fluid Prandtl number = 0.71.
• Jet to impingement distance H of 6 pipe diameters.
• Cylindrical polar computational grid.
• Turbulence represented via Lam-Bremhorst low-Reynolds-number k-e turbulence model with Yap lengthscale correction.
• The jet exhausts to ambient conditions with an ambient injection temperature.

  NOTES :

• The flow has been studied experimentally by Cooper et al [1992] and Baughn et al [1992].
• The mesh employed is 70 (radial) by 112 (axial) using a high concentration of grid cells in the near-wall layer.
• Computational domain of 6 diameters axial extent by 7 diameters radial extent.
• The incoming jet flow is fully developed pipe flow.
• Uniform physical properties.
• Convection terms discretised with SMART scheme.
• For comparison, additional calculations are made with the 2-layer low-Re k-e model and the high-Re k-e model + yap correction.

  PICTURES :

  1. Normalised velocity vectors V/Vj 2. Nusselt number distribution 3. Measured and predicted absolute velocity profile at R/D=0.0 4. Measured and predicted absolute velocity profile at R/D=2.5

  TURBULENT IMPINGING ROUND JET: Normalised velocity vectors
  TURBULENT IMPINGING ROUND JET: Nusselt number distribution
  TURBULENT IMPINGING ROUND JET: Absolute Velocity Profiles at R/D=0.0
  TURBULENT IMPINGING ROUND JET: Absolute Velocity Profiles at R/D=2.5