how can i calculate vapor quality?

P_VS · July 30, 2016, 13:28

Hello!

Is there a way of calculating vapor quality or vapor mass fraction in Fluent or CFD post?
I am able to calculate vapor volume fraction but i can't see a way of computing the mass fraction.

Thank you!

ComputerGuy · August 22, 2016, 14:48

Vapor mass fraction is found by bringing density into the equation:

$Vapor Mass Fraction= \frac{ \rho _{vapor} * vol frac vapor}{\rho _{vapor} * vol frac vapor+\rho _{everything else} *(1- vol frac vapor)}$

Of course, "rho everything else" is just a shortcut, as is the (1-vol frac vapor). You'll need to multiply every phase's density by its volume fraction, such that you have N terms in the denominator for an N-phase system.

July 30, 2016, 13:28	how can i calculate vapor quality?	#1
P_VS New Member Join Date: Oct 2015 Posts: 12 Rep Power: 11	Hello! Is there a way of calculating vapor quality or vapor mass fraction in Fluent or CFD post? I am able to calculate vapor volume fraction but i can't see a way of computing the mass fraction. Thank you!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
calculate velocity difference	helly	OpenFOAM Post-Processing	0	June 21, 2016 09:49
is it possible to calculate circulation for this image	Roule	Tecplot	0	March 10, 2016 05:16
Error occurred during calculate mass flux	aronsyu	Fluent UDF and Scheme Programming	0	December 28, 2015 08:16
calculate values for eps and k from Re or u?????	sbar	OpenFOAM Pre-Processing	5	August 16, 2010 05:10
How to calculate Torque for francis turbine	manish	CFX	4	March 15, 2007 03:57

August 22, 2016, 14:48		#2
ComputerGuy Senior Member Real Name :) Join Date: Jan 2010 Location: United States Posts: 192 Rep Power: 16	Vapor mass fraction is found by bringing density into the equation: $Vapor Mass Fraction= \frac{ \rho _{vapor} * vol frac vapor}{\rho _{vapor} * vol frac vapor+\rho _{everything else} *(1- vol frac vapor)}$ Of course, "rho everything else" is just a shortcut, as is the (1-vol frac vapor). You'll need to multiply every phase's density by its volume fraction, such that you have N terms in the denominator for an N-phase system.