Transport Velocity of Water

[KenRad]

I have a process exhaust that needs to move moist air. Part of the duct system is horizontal, and part is a straight vertical run. I want the water droplets to move with the air, and not run down the inside of the duct wall. What would my minimum transport velocity need to be? I know that I could overkill and get it to work, but I'd rather have some good design numbers to start out with.

---KenRad

 

[25362]

There are published specialized flow maps, that need more thermophysical data, and a mass or volumetric ratio between air and water, to be of help.

I suggest you get help from Perry (Chem. Eng. Handbook). It gives "ballpark" figures on gas velocities, as well as maps in which different flow r[é]gimes (and mist flow in particular) appear as functions of mass ratios, etc.