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Simulation of turbulent swirling flow in convergent nozzles

Nouri-Borujerdi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.scient.2012.01.006
  3. Abstract:
  4. This work simulates the turbulent boundary layer of an incompressible viscous swirling flow through a conical chamber. To model the pressure gradient normal to the wall, the radial and tangential velocity components across the boundary layer have been calculated by both the integral and numerical methods. The numerical solution is accomplished by finite difference, based on the finite volume method. The results show that the radial and tangential boundary layer thicknesses depend on the velocity ratios, Reynolds number and nozzle angle. The peak of radial and tangential boundary layer thicknesses are located at zL≈0.2 and zL≈0.8 from the nozzle inlet, respectively. Due to the short length of the nozzle, the contribution of momentum change on pressure loss is more significant than that on the shear stress. Also, the pressure gradient normal to the wall had been considered more accurately than that of the previous attempts
  5. Keywords:
  6. Boundary layer ; Integral and numerical method ; Nozzle ; Turbulent swirling flow ; Convergent nozzles ; Finite difference ; Nozzle angle ; Numerical solution ; Pressure loss ; Tangential velocity component ; Turbulent boundary layers ; Turbulent swirling flows ; Velocity ratio ; Atmospheric thermodynamics ; Boundary layer flow ; Boundary layers ; Numerical methods ; Pressure gradient ; Swirling flow ; Nozzles ; Finite element method ; Finite volume method ; Incompressible flow ; Numerical model ; Reynolds number ; Shear stress ; Turbulent flow ; Velocity structure
  7. Source: Scientia Iranica ; Volume 19, Issue 2 , 2012 , Pages 258-265 ; 10263098 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S102630981200048X