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K-ε has smallest high and low velocity region. This explain why it has the lowest pressure coefficient drop. K-ω has the biggest region of high and low velocity. K-ω has highest pressure coefficient drop.
44. Conclusions
1. An area of recirculation occurs near the center wall immediately after the turn.
2. Our CFD result has shown that: . Pressure coefficient drop over one baffle turn is 3.75.
3. After a clearance height of one baffle width or greater, the pressure coefficient drop and the maximum velocity becomes constant.
4. Most of the energy dissipation occurs in the region after the turn over a distance of about two baffle width.
5. The pressure drop is insensitive to the Reynolds number for a large range of inlet velocities.
6. About 20,000 mesh elements is sufficient to obtain accurate modeling results.
7. Different turbulence model resulted in fairly different results.
5. Acknowledgements
During the course of this project, we received invaluable advice and direction from Dr. Monroe Weber-Shirk, whose direction of the AguaClara team project spurred this research and technical investigation. All questions we had were directed towards Dr. Rajesh Bhaskaran, his expertise and academic guidance kept us on schedule and on task. We would also like to thank Prof. Brian Kirby for elucidating some technical aspects we encountered. For their help, we are grateful.
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