Problems about phase-change simulation inside a heat pipe

6863523 · October 8, 2014, 20:59

Dear guys,
I am simulating the phase change phenomenon inside a flat heat pipe using cavitation model in fluent software. But the results are not desirable as seen athttp://www.cfd-online.com/Forums/mem...r+chamber.html
The temperature inside the heat pipe is wired. The distribution should be like this, the lowest temperature shows up at the heat outlet, the highest temperature appears at the heat inlet, and the temperature in the channel should be in between.
Any suggestions would be appreciated. Thank you.

6863523 · October 10, 2014, 23:37

No one interested? I am waiting

aminem · October 14, 2014, 10:30

I have done some similar simulation, can you give some details (physics, boundary condition,...) about your simulation

6863523 · October 14, 2014, 10:37

I do not know how to upload the pictures that I need to show you.
My email is 815719752@qq.com , just for convinient.
Thank you for your reply.

aminem · October 14, 2014, 10:44

you have manage attachement button at the end of page

6863523 · October 14, 2014, 10:50

Dear amine,
I sent you an email via this forum. I wonder if you have received. I am sorry to disturb you without asking for permission.
I am simulating the evaporation of liquid water and condensation of water vapor now. I patched two rigions, one was for liquid water in the wick and the other was for vapor. Evaporation occurs at the wick-vapor surface due to the heat inlet nearby.
Sorry,I did not found the attachment button on this pape.
Best Regards,
Bill

aminem · October 14, 2014, 10:59

Try to decrease your time step to have good convergence. In your picture you finish simulation at 1.5s I think it's not sufficient

6863523 · October 14, 2014, 11:07

Dear amine,
The picture you have seen is not finished yet. I have run the simulation for about 13s and it converged, but the temperature distribution is not good as can be seen at http://www.cfd-online.com/Forums/mem...ults+pics.html

October 8, 2014, 20:59	Problems about phase-change simulation inside a heat pipe	#1
6863523 Senior Member Bill Wang Join Date: Aug 2014 Posts: 109 Rep Power: 12	Dear guys, I am simulating the phase change phenomenon inside a flat heat pipe using cavitation model in fluent software. But the results are not desirable as seen athttp://www.cfd-online.com/Forums/mem...r+chamber.html The temperature inside the heat pipe is wired. The distribution should be like this, the lowest temperature shows up at the heat outlet, the highest temperature appears at the heat inlet, and the temperature in the channel should be in between. Any suggestions would be appreciated. Thank you.

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October 10, 2014, 23:37		#2
6863523 Senior Member Bill Wang Join Date: Aug 2014 Posts: 109 Rep Power: 12	No one interested? I am waiting

October 14, 2014, 10:30		#3
aminem Member amine Join Date: Jan 2014 Location: FRANCE Posts: 84 Rep Power: 12	I have done some similar simulation, can you give some details (physics, boundary condition,...) about your simulation

October 14, 2014, 10:37		#4
6863523 Senior Member Bill Wang Join Date: Aug 2014 Posts: 109 Rep Power: 12	I do not know how to upload the pictures that I need to show you. My email is 815719752@qq.com , just for convinient. Thank you for your reply.

October 14, 2014, 10:44		#5
aminem Member amine Join Date: Jan 2014 Location: FRANCE Posts: 84 Rep Power: 12	you have manage attachement button at the end of page

October 14, 2014, 10:50		#6
6863523 Senior Member Bill Wang Join Date: Aug 2014 Posts: 109 Rep Power: 12	Dear amine, I sent you an email via this forum. I wonder if you have received. I am sorry to disturb you without asking for permission. I am simulating the evaporation of liquid water and condensation of water vapor now. I patched two rigions, one was for liquid water in the wick and the other was for vapor. Evaporation occurs at the wick-vapor surface due to the heat inlet nearby. Sorry,I did not found the attachment button on this pape. Best Regards, Bill

October 14, 2014, 10:59		#7
aminem Member amine Join Date: Jan 2014 Location: FRANCE Posts: 84 Rep Power: 12	Try to decrease your time step to have good convergence. In your picture you finish simulation at 1.5s I think it's not sufficient

October 14, 2014, 11:07		#8
6863523 Senior Member Bill Wang Join Date: Aug 2014 Posts: 109 Rep Power: 12	Dear amine, The picture you have seen is not finished yet. I have run the simulation for about 13s and it converged, but the temperature distribution is not good as can be seen at http://www.cfd-online.com/Forums/mem...ults+pics.html