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-   -   how to analysis double pipe heat exchanger in cfx (http://www.cfd-online.com/Forums/cfx/88282-how-analysis-double-pipe-heat-exchanger-cfx.html)

rammax8 May 12, 2011 14:25

how to analysis double pipe heat exchanger in cfx
 
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

is their any book available which has step by step procedure to work on heat exchange
 
Quote:

Originally Posted by Lance (Post 307457)
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 (Post 307900)
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 22:15

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 15:49

interface error
 
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 17:10

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


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