1 / 28

Designing equipment by using CFD Benefits and pitfalls

Designing equipment by using CFD Benefits and pitfalls. Geert Janssen Advanced Thermal Transfer Equipment A2TE. CFD - Phoenics. CORA2 – graduate studies Phoenics user since 1985 Analysis Flow in intake manifolds of IC engines Flow & heat transfer process industry Design from 1990

alesia
Télécharger la présentation

Designing equipment by using CFD Benefits and pitfalls

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Designing equipment by using CFDBenefits and pitfalls Geert Janssen Advanced Thermal Transfer Equipment A2TE

  2. CFD - Phoenics • CORA2 – graduate studies • Phoenics user since 1985 • Analysis • Flow in intake manifolds of IC engines • Flow & heat transfer process industry • Design from 1990 • Heat transfer equipment • Ovens and furnaces

  3. Applied CFD • Better understanding • Flow • Heat transfer • Mass transfer • Chemics • Sensitivity analysis • Priceworthy • fast

  4. Why limited CFD usage • Long learning curve • Specialists required • Jargon • physics insight and knowledge ? • Standard rules from handbooks? • Design <-> modelling • Communication skills

  5. Example - 1 • Oven • Perforated plates • Flow distributors

  6. Example - 2 • Molten metal in tundish • Target • Continuous casting • No slag inclusions • No bubbles

  7. Tundish • Symmetric inflow • Steady state ? • No match with experimental data • Blame on CFD?

  8. Designing equipment & CFD • Rules of thumb • Standard textbooks • Some understanding of physics • CFD ‘tricks’ • Designers skills or strong interaction with designer

  9. Example 3 - ageing oven • Continuous belt oven • Base of lamp (automotive) • 3 lanes: 3 x 800 pcs/hr • Heating to 200°C and holding for 4 hrs • Cooling to 50°C • Floorspace approx. 5 m2 • Temperature differences < 5°C

  10. Ageing oven - 2 • Heat transfer and pressure drop from packed bed relations • Required velocities through belt • Heating section • Cooling section • Fan in holding section identical to those of other sections

  11. Ageing oven - 3

  12. Ageing oven - 4

  13. Ageing oven - 5

  14. Ageing oven - 6 • CFD model took 3 days • Conceptual design 2 weeks

  15. Ageing oven - 7

  16. Ageing oven - 8

  17. Example 4 curing oven • Contact lenses • Automated process • Polypropylene: 95°C ± 3°C • At least 15 minutes at 92°C (minimum) • Heating up in 10 – 12 minutes • Aluminium trays, 1300 grams • 1 tray in 40 seconds

  18. Curing oven - tray

  19. Curing oven - analytical • Calculation of required heat transfer coefficient (mass – time) • High value needed (75 Wm-2K-1) • Multiple jets • One heat-up zone • Costs (fan, controller, cabinet)

  20. Curing oven - tray

  21. Curing oven - tray

  22. Curing oven - tray

  23. Curing oven • Conclusions from tray calculations • Required air-inlet temperature > 105°C

  24. Curing oven – cross section

  25. Curing oven - power change

  26. Curing oven - belt level

  27. Curing oven – CFD model • CFD models: 2 weeks • Conceptual design 4 weeks

  28. Conclusions • Use of CFD can be very profitable • Often CFD alone does not ‘do the trick’ • Handbooks • Rules • Experience

More Related