how to analysis double pipe heat exchanger in cfx

rammax8 · May 12, 2011, 14:25

hii friends,
i'm ram krishna.i have taken final year project to simulate a double pipe heat exchanger but i don't know how to do it.can some one tell me step by step procedure to simulate a double pipe heat exchanger in ansys cfx.
i want to know everything from mess generation to defining inlet, outlet, how to set fluid properties and how to give domain interface. i have to finish my project by 30 may so some one please help me. i will be very grateful to you.
thank you very much

Lance · May 13, 2011, 02:34

No one is going to write a step-by-step tutorial for you, especially if you have no prior knowledge about CFX. I suggest that you do a lot of tutorials to familiarize yourself with the program. Have a look at tutorial 16 which deals with heat transfer from a heating coil.

rammax8 · May 13, 2011, 05:31

Quote:

Originally Posted by Lance

No one is going to write a step-by-step tutorial for you, especially if you have no prior knowledge about CFX. I suggest that you do a lot of tutorials to familiarize yourself with the program. Have a look at tutorial 16 which deals with heat transfer from a heating coil.

hii friend,
thank you for your concern. is their any book available from where i can learn the procedure of analyzing heat exchangers in cfx or fluent.

Lance · May 13, 2011, 05:51

I haven't seen a dedicated CFX book on heat exchangers, that's why I said that you should look into tutorial 16. The manual will also be useful.

gullapallivijay · May 16, 2011, 06:12

You might need to perform conjugate heat transfer for double pipe heat exchanger. Moreover, proper near wall resolution is necessary. Meshing for the solid domain can be tricky due to large aspect ratio and you might need to have a number of cell layers (something like 4-5) in pipe domain. k-w SST model is recommended when you have separated flows etc.

ghorrocks · May 16, 2011, 18:55

If the solid wall is thin you can use the new capability (V13 I think) to put a thin interface between two fluid regions. This way you do not mesh the thin solid layer, but replace it with a representative thermal resistance. This may simplify things for you.

gullapallivijay · May 17, 2011, 03:39

Agree with ghorrocks. Thin interface is possible. But sometimes, pipe features enhance or deter local heat transfer and temperature difference. In those cases CHT is interesting for determining local distribution of wall temperatures and heat flux for pipe domain and wall heat transfer coefficients etc for fluid domains

ghorrocks · May 17, 2011, 19:07

Obviously if reducing the solid down to a simple thermal resistance is not appropriate then the thin surface approach is not appropriate. Also keep in mind I do not think the thin surface takes into account the thermal mass of the solid (I think). So if you are interested in transient behaviour you will also have to determine if the solid time scale is fast enough to be ignored.

rammax8 · May 24, 2011, 10:44

Quote:

Originally Posted by gullapallivijay

Agree with ghorrocks. Thin interface is possible. But sometimes, pipe features enhance or deter local heat transfer and temperature difference. In those cases CHT is interesting for determining local distribution of wall temperatures and heat flux for pipe domain and wall heat transfer coefficients etc for fluid domains

hii vijay..thanks for your replies...but i really need help.i can't do it on my own i tried it..my last date for submission of project is 15 june.can u let me any other way to do.like step by step procedure from modelling to analyzing in any cfd software.
thanking you
regards,
ram krishna

ghorrocks · May 24, 2011, 19:13

I do not have time to write step by step procedures.

If you tell us what does not seem to be working we will try to help.

davidrlc89 · March 29, 2013, 21:15

this is a quick way to simulate the heat transfer through the solid, and if the version 13.0.
The only problem with doing this is that you will do the transfer only in one dimension.
But it's good to start your simulation aporximacion.
regards

hardiksam · February 14, 2014, 14:49

in post processing, i m getting error related to interface...
so what parameters should i modify in order to get simulation result.

ghorrocks · February 14, 2014, 16:10

Please start a new thread for a new question. And when you do please include enough information to make it a worthwhile question - see http://www.cfd-online.com/Wiki/Ansys...ible_answer.3F

May 12, 2011, 14:25	how to analysis double pipe heat exchanger in cfx	#1
rammax8 New Member Ram krishna shah Join Date: May 2011 Location: india Posts: 4 Rep Power: 14	hii friends, i'm ram krishna.i have taken final year project to simulate a double pipe heat exchanger but i don't know how to do it.can some one tell me step by step procedure to simulate a double pipe heat exchanger in ansys cfx. i want to know everything from mess generation to defining inlet, outlet, how to set fluid properties and how to give domain interface. i have to finish my project by 30 may so some one please help me. i will be very grateful to you. thank you very much

May 16, 2011, 06:12		#5
gullapallivijay New Member Vijaya Sekhar Gullapalli Join Date: May 2011 Location: Sweden Posts: 6 Rep Power: 14	You might need to perform conjugate heat transfer for double pipe heat exchanger. Moreover, proper near wall resolution is necessary. Meshing for the solid domain can be tricky due to large aspect ratio and you might need to have a number of cell layers (something like 4-5) in pipe domain. k-w SST model is recommended when you have separated flows etc. davidrlc89 likes this.

May 16, 2011, 18:55		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If the solid wall is thin you can use the new capability (V13 I think) to put a thin interface between two fluid regions. This way you do not mesh the thin solid layer, but replace it with a representative thermal resistance. This may simplify things for you. amin_gls likes this.

May 17, 2011, 03:39		#7
gullapallivijay New Member Vijaya Sekhar Gullapalli Join Date: May 2011 Location: Sweden Posts: 6 Rep Power: 14	Agree with ghorrocks. Thin interface is possible. But sometimes, pipe features enhance or deter local heat transfer and temperature difference. In those cases CHT is interesting for determining local distribution of wall temperatures and heat flux for pipe domain and wall heat transfer coefficients etc for fluid domains amin_gls likes this.

February 14, 2014, 14:49	interface error	#12
hardiksam New Member hardik thakkar Join Date: Feb 2014 Posts: 2 Rep Power: 0	in post processing, i m getting error related to interface... so what parameters should i modify in order to get simulation result.

May 13, 2011, 02:34		#2
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	No one is going to write a step-by-step tutorial for you, especially if you have no prior knowledge about CFX. I suggest that you do a lot of tutorials to familiarize yourself with the program. Have a look at tutorial 16 which deals with heat transfer from a heating coil.

May 13, 2011, 05:51		#4
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	I haven't seen a dedicated CFX book on heat exchangers, that's why I said that you should look into tutorial 16. The manual will also be useful.

May 17, 2011, 19:07		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Obviously if reducing the solid down to a simple thermal resistance is not appropriate then the thin surface approach is not appropriate. Also keep in mind I do not think the thin surface takes into account the thermal mass of the solid (I think). So if you are interested in transient behaviour you will also have to determine if the solid time scale is fast enough to be ignored.

May 24, 2011, 19:13		#10
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I do not have time to write step by step procedures. If you tell us what does not seem to be working we will try to help.

March 29, 2013, 21:15		#11
davidrlc89 New Member David Lopez Join Date: Dec 2012 Location: Venezuela Posts: 9 Rep Power: 13	this is a quick way to simulate the heat transfer through the solid, and if the version 13.0. The only problem with doing this is that you will do the transfer only in one dimension. But it's good to start your simulation aporximacion. regards

February 14, 2014, 16:10		#13
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Please start a new thread for a new question. And when you do please include enough information to make it a worthwhile question - see http://www.cfd-online.com/Wiki/Ansys...ible_answer.3F

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