Presentation on theme: "Designing equipment by using CFD Benefits and pitfalls Geert Janssen Advanced Thermal Transfer Equipment A2TE."— Presentation transcript:
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 Heat transfer equipment –Ovens and furnaces
Applied CFD Better understanding –Flow –Heat transfer –Mass transfer –Chemics Sensitivity analysis Priceworthy fast
Why limited CFD usage Long learning curve Specialists required –Jargon –physics insight and knowledge ? –Standard rules from handbooks? Design modelling –Communication skills
Example - 1 Oven Perforated plates –Flow distributors
Example - 2 Molten metal in tundish Target –Continuous casting –No slag inclusions –No bubbles
Tundish Symmetric inflow Steady state ? No match with experimental data Blame on CFD?
Designing equipment & CFD Rules of thumb Standard textbooks Some understanding of physics CFD ‘tricks’ Designers skills or strong interaction with designer
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 m 2 Temperature differences < 5°C
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
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
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