2 replies to this topic

[vjindia]

Hello all,

I am trying to find the pressure drop/loss of a multi-beam support plate (for random packed columns) installed in a column, but my solution based on orifice plate calcualtion gives a high pressure drop, but in reality it should be low!!!.

Data: 0.5m support plate with 810 slots (free cross section of 98 %), dimension of round edged rectangular slots: Area 2.39 x 10-4 m2 and circumference 0.0634 m, air flow 3600 m3/hr, density 1.2 kg/m3, viscosity 18.6 x 10-6 Ns/m2, temperature 30 °C and pressure 1 atm.

I just wanted to know the pressure drop due to this plate, can anyone suggest me the procedure or how to approach the problem.

Any help is highly appreciated....Thanks

[Andree]

you can:
1. develop CFD model (quit simple)
2. use relation as for flow through porous media - I am not sure if this will give reliable result, but I cannot see any limiting constraints...

[Zauberberg]

I think you can find some general correlations in distillation textbooks or published vendor materials. Pressure drop across the support plate usually is not an issue, especially if you have 98% open area (which sounds a little bit off-the-range, by the way). The maximum pressure drop you'll get with this area should be about 5%.

Check Kister and Ludwig books, and look for more info at KG and Sulzer websites.
Best regards,