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ANALYZE THE COMPRESSIBLE FLOW CHARACTERISTICS IN A CHANNEL WITH DOUBLE ELBOWS BY FINITE ELEMENT METHODS | ||
| AL-TAQANI | ||
| Article 1, Volume 28, Issue 1, 2015, Pages 0-0 | ||
| Author | ||
| Ahmed Hassan Khuder | ||
| Abstract | ||
| Two–dimensionalnumericalsimulation iscarriedouttostudythefundamental characteristicsof compressible flowsthrough double elbow channel, the air used as a working substance. One channelinclude horizontal flow enters first elbow and the other include vertical entrance to the second elbow. In thispaper,theflow fields in two elbows with their dead zone have beeninvestigated.Anon-lineark- Є model isemployed to solve the flow characteristics by using the finiteelementmethodwithacurvilinearcoordinate system near the dead zoneThe k-Є model is a semi-empirical model based on model transport equations for turbulent kinetic energy k and its dissipation rate ε. i.e. the rate at which turbulent kinetic energy is converted into internal energy by viscous action. The derivation of turbulent kinetic energy and its rate of dissipation derived from Navier stocke equation. The model geometry and mesh were created using the COMSOL 3.5 software. This results of the simulations that have been made to date; baseline results employing the k-ε turbulence model are presented, the predicted value for the flow characteristics in double elbow is in reasonably good agreement with published correlations. For accurate solution the computation is considered converged to the steady solution, when the value of the maximal normalized equation residual is less than (10-6). The model applied for two different flow velocities (20m/s) and (30 m/s) and the obtained results presented as curves, surface and contours for velocities turbulent kinetic energy , rate of dissipation of turbulent kinetic energy and vortices .the builded model can be utilized for academic purpose since, it widely used were most flow systems contain elbows. | ||
| Keywords | ||
| compressible flow; sudden change flow; flow in elbow | ||
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