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Numerical simulation of developing compressible turbulent flow with heat transfer

Nouri Borujerdi, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.2514/1.41669
  3. Publisher: 2009
  4. Abstract:
  5. This study investigates the effects of wall heating and skin friction on the characteristics of a compressible turbulent flow in developing and developed regions of a pipe. The numerical solution is performed by finite-element-based finite volume method applied on unstructured grids. A modified κ-ε model with a two-layer equation for the near-wall region and a compressibility correction are used to predict turbulent viscosity. The results show that shear stress in fully developed flow is nearly constant from the centerline up to 75% of the pipe radius, then increases sharply next to the wall, and the ratio of the turbulent viscosity to the molecular one is less than 0.2. Under a uniform wall heat flux condition, the friction factor decreases in the entrance region and will be fully developed after Z/D > 50, but the Nusselt number increases first and then will be fully developed after Z/D > 10. In addition, the heat flux accelerates the developing compressible flow and causes the entrance length to decrease, unlike the incompressible flow
  6. Keywords:
  7. Centerlines ; Compressibility correction ; Entrance length ; Entrance region ; Finite-element ; Friction factors ; Near-wall region ; Numerical simulation ; Numerical solution ; Turbulent viscosity ; Two layers ; Uniform wall heat flux ; Unstructured grid ; Computer simulation ; Friction ; Heat flux ; Numerical analysis ; Pipe ; Turbulent flow ; Vehicular tunnels ; Viscosity ; Incompressible flow
  8. Source: Journal of Thermophysics and Heat Transfer ; Volume 23, Issue 4 , 2009 , Pages 801-809 ; 08878722 (ISSN)
  9. URL: https://arc.aiaa.org/doi/abs/10.2514/1.41669