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Calculating pressure drop in steam line with saturated steam

Calculating pressure drop in steam line with saturated steam

Calculating pressure drop in steam line with saturated steam

(OP)
Hello,
I am trying to calculate the pressure drop in a series of pipes (bed tubes and wall tubes).  The question I have is based on how to handle this when there is steam in the pipe.  

If the water in the pipe is 50% steam by volume, that means for a given flow, the water must be traveling twice as fast as it would be if there was only water in the pipe.  

Can I simply assume that all friction factors remain the same and do my calculations with the increased velocity?  So for 50% steam my pressure drop would go up by a factor of 4.

Or can I use two friction factors, one for steam and one for water, and treat the problem in two pieces?

Any help would be appreciated.

thanks,
Andy

 

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