Loading...

Numerical investigation of turbulent free jet flows issuing from rectangular nozzles: The influence of small aspect ratio

Faghani, E ; Sharif University of Technology | 2010

1314 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s00419-009-0340-z
  3. Publisher: 2010
  4. Abstract:
  5. In this research, the fluid and thermal characteristics of a rectangular turbulent jet flow is studied numerically. The results of three-dimensional jet issued from a rectangular nozzle are presented. A numerical method employing control volume approach with collocated grid arrangement was employed. Velocity and pressure fields are coupled with SIMPLEC algorithm. The turbulent stresses are approximated using k-ε model with two different inlet conditions. The velocity and temperature fields are presented and the rates of their decay at the jet centerline are noted. The velocity vectors of the main flow and the secondary flow are illustrated. Also, effect of aspect ratio on mixing in rectangular cross-section jets is considered. The aspect ratios that were considered for this work were 1:1 to 1:4. The results showed that the jet entrains more with smaller AR. Special attention has been drawn to the influence of the Reynolds number (based on hydraulic diameter) as well as the inflow conditions on the evolution of the rectangular jet. An influence on the jet evolution is found for smaller Re, but the jet is close to a converged state for higher Reynolds numbers. The inflow conditions have considerable influence on the jet characteristics
  6. Keywords:
  7. Inlet condition ; Collocated grids ; Control volumes ; Hydraulic diameter ; Inflow conditions ; Inlet conditions ; Numerical investigations ; Numerical simulation ; Pressure field ; Rectangular cross-sections ; Rectangular jet ; Rectangular nozzle ; SIMPLEC algorithm ; Small aspect ratio ; Temperature field ; Thermal characteristics ; Turbulent free jets ; Turbulent jet ; Turbulent stress ; Velocity vectors ; Computer simulation ; Intake systems ; Nozzles ; Pressure drop ; Reynolds number ; Aspect ratio
  8. Source: Archive of Applied Mechanics ; Volume 80, Issue 7 , 2010 , Pages 727-745 ; 09391533 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs00419-009-0340-z