Flow of gases through a capillary

[Ella123]

You have a capillary with a stream of water vapor flowing through. Inside the capillary argon gas is also flowing (in the same direction) with a flow rate of 3 L/min. How high of a flow rate can the water vapor have before it starts condensing on the walls? Flow is laminar and the system is at atmospheric pressure.

 

[andrevdh]

You need to check a phase diagram for water. It shows the transitions between the various phases at the various pressures and temperatures. I do not think the presence of argon would change this since it is a noble gas. For instance : http://www1.lsbu.ac.uk/water/water_phase_diagram.html