Boiling in CFX

February 26, 2001, 11:45

I am trying to model boiling in a small channel with a constant fluid velocity and a heated wall. However, try as I might I can't get the model to boil. I have looked over both of the boiling examples and I can not see why mine won't work. I have tried changing fluid velocity to both high and low Reynolds numbers. I have also tried increasing the wall temperature to see if I just didn't have enough heat.

The simplified model I am attempting is vary similar to the example in the manual but mine just won't work. It runs through the solver fine and the flow profile and temperature profile in the channel look reasonable but no boiling occurs.

I was hoping someone has had some experience with this type of problem and can give me some pointers on what I might be doing wrong.

Thanks in advance!

R. Harrison Utah State University

February 27, 2001, 04:17

Hi , I have used the boiling model, and it did boil.

What is the temperature and pressure? are you close to saturation?

For testing - try to set your inlet temperature close to the saturation temperature and increase your wall heat flux. Then something should happen for sure.

regards Jan

d.khoeeni · March 12, 2001, 10:56

The boiling model of CFX-4 is very difficult to get any converged solution. If your problem is defined with a fluid almost at saturation and the heat flux is sufficiently high it shall boil when you have forced the code to converge....

Myself I have stopped to work with the boiling model of CFX-4 and I have implemented my own and this is really working under all conditions including film condensation, homogenous boiling, cavitation...

sascha

sharonbashyam · December 6, 2012, 11:54

hi could you please kindly help me the process to be done in boiling and condensation in cfx, cause my project is on heat pipe.If you can help me i will be obliged.If so please kindly mail me at sharon340mech@yahoo.com

evcelica · December 6, 2012, 22:30

The last post was over a decade ago, I doubt they are still checking this. Also you have not asked a question in your post.

sharonbashyam · December 7, 2012, 01:14

thank you evcelica for your kind response ..would you please guide me regarding my problem ...

February 26, 2001, 11:45	Boiling in CFX	#1
Richard Harrison Guest Posts: n/a	I am trying to model boiling in a small channel with a constant fluid velocity and a heated wall. However, try as I might I can't get the model to boil. I have looked over both of the boiling examples and I can not see why mine won't work. I have tried changing fluid velocity to both high and low Reynolds numbers. I have also tried increasing the wall temperature to see if I just didn't have enough heat. The simplified model I am attempting is vary similar to the example in the manual but mine just won't work. It runs through the solver fine and the flow profile and temperature profile in the channel look reasonable but no boiling occurs. I was hoping someone has had some experience with this type of problem and can give me some pointers on what I might be doing wrong. Thanks in advance! R. Harrison Utah State University

February 27, 2001, 04:17	Re: Boiling in CFX	#2
Jan Rusås Guest Posts: n/a	Hi , I have used the boiling model, and it did boil. What is the temperature and pressure? are you close to saturation? For testing - try to set your inlet temperature close to the saturation temperature and increase your wall heat flux. Then something should happen for sure. regards Jan

March 12, 2001, 10:56	Re: Boiling in CFX	#3
Sascha Guest Posts: n/a	The boiling model of CFX-4 is very difficult to get any converged solution. If your problem is defined with a fluid almost at saturation and the heat flux is sufficiently high it shall boil when you have forced the code to converge.... Myself I have stopped to work with the boiling model of CFX-4 and I have implemented my own and this is really working under all conditions including film condensation, homogenous boiling, cavitation... sascha d.khoeeni likes this.

December 6, 2012, 11:54	help regarding the boling and condensation process	#4
sharonbashyam New Member sharon Join Date: Sep 2012 Posts: 6 Rep Power: 14	hi could you please kindly help me the process to be done in boiling and condensation in cfx, cause my project is on heat pipe.If you can help me i will be obliged.If so please kindly mail me at sharon340mech@yahoo.com

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Need Help to Enable Wall Boiling Model in CFX	cjhaw	CFX	3	September 26, 2013 10:40
Cryogenic boiling: CFX or FLUENT	Graduation	Main CFD Forum	2	September 30, 2011 03:30
subcooled boiling in CFX	zahed	CFX	0	April 19, 2011 21:32
nucleate boiling simulation in CFX	Anil	CFX	3	August 25, 2010 15:18
CFX 4.4 installation problem	Pandu Sattvika	CFX	1	December 1, 2001 05:07

December 6, 2012, 22:30		#5
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	The last post was over a decade ago, I doubt they are still checking this. Also you have not asked a question in your post.

December 7, 2012, 01:14		#6
sharonbashyam New Member sharon Join Date: Sep 2012 Posts: 6 Rep Power: 14	thank you evcelica for your kind response ..would you please guide me regarding my problem ...