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Shell and Tubbe Heat Exchanger Design - Fluent
 
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benton.allen
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Joined: 09 Apr 2014
Posts: 2

PostPosted: Mon Apr 14, 2014 9:39 am  Reply with quote

Hello Community,

I am new to ANSYS and have been commissioned to design a modified shell and tube heat exchanger. Basically, it is an oil tank with an inlet and outlet at specific pressures. Then, the tank will have a number of open air tubes running through its length in order to cool the oil while it is in the tank. I am having trouble getting the tanks I have designed to be analyzed in Fluent (the meshing is not correct and I keep getting errors). So, I am wondering if anyone has some advice for A) the best way to design the tank, and B) how to analyze the system in fluent. I am doing my best to teach the system to myself but have been having a hard time finding reference material. Any help you could throw my way would be greatly appreciated.

Best,
Benton Allen
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hervandil.santanna
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Joined: 06 Jan 2009
Posts: 116

PostPosted: Mon Apr 14, 2014 9:47 am  Reply with quote

Hello,

I don't use Fluent, but as a general hint, try to find a simple example in
workbooks (in this case, I suggest Introduction to Heat Transfer, by Frank
P. Incropera (Author), David P. DeWitt (Author), Theodore L.
Bergman (Author), Adrienne S. Lavine ).
Then, try to reproduce this simple example in Fluent, and you will have the
sensitivity of the Fluent functions.
Good luck!

___________________________________
Hervandil Morosini Sant'Anna
Engenheiro de Equipamentos
Petrobras - AB-RE/ES/TIE - Chave: cji2
Tel: (21) 2166-4013 / Rota: 706-4013
e-mail: hmsantanna@petrobras.com.br





De: "benton.allen" <bfallen1@buffs.wtamu.edu>
Para: xansys@xansys.org,
Data: 14/04/2014 13:41
Assunto: [Xansys] Shell and Tubbe Heat Exchanger Design - Fluent
Enviado por: "Xansys" <xansys-bounces@xansys.org>



Hello Community,

I am new to ANSYS and have been commissioned to design a modified shell and
tube heat exchanger. Basically, it is an oil tank with an inlet and outlet
at specific pressures. Then, the tank will have a number of open air tubes
running through its length in order to cool the oil while it is in the
tank. I am having trouble getting the tanks I have designed to be analyzed
in Fluent (the meshing is not correct and I keep getting errors). So, I am
wondering if anyone has some advice for A) the best way to design the tank,
and B) how to analyze the system in fluent. I am doing my best to teach
the system to myself but have been having a hard time finding reference
material. Any help you could throw my way would be greatly appreciated.

Best,
Benton Allen






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osman.buyukisik
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Joined: 10 Aug 2009
Posts: 24

PostPosted: Mon Apr 14, 2014 10:04 am  Reply with quote

Benton,
Don't use conjugate CFD to design a heat exchanger. Just look it up in the undergrad heat transfer books. You really have to be familiar with CFD in order to do it using Fluent. Also it will take quite a bit longer than doing it by hand. Since you are affiliated with wtamu , go to the library look for "heat transfer pocket handbook". Any of the graduate heat transfer books will also have it.
N.B. Include your affiliation in your sig per the mail list requirements.

Osman Buyukisik
GE Aviation
Product Engineering Center - LPT/MS

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of benton.allen
Sent: Monday, April 14, 2014 12:40 PM
To: xansys@xansys.org
Subject: [Xansys] Shell and Tubbe Heat Exchanger Design - Fluent

Hello Community,

I am new to ANSYS and have been commissioned to design a modified shell and tube heat exchanger. Basically, it is an oil tank with an inlet and outlet at specific pressures. Then, the tank will have a number of open air tubes running through its length in order to cool the oil while it is in the tank. I am having trouble getting the tanks I have designed to be analyzed in Fluent (the meshing is not correct and I keep getting errors). So, I am wondering if anyone has some advice for A) the best way to design the tank, and B) how to analyze the system in fluent. I am doing my best to teach the system to myself but have been having a hard time finding reference material. Any help you could throw my way would be greatly appreciated.

Best,
Benton Allen






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| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
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| Send administrative requests to xansys-mod@tynecomp.co.uk |
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Osman Buyukisik
Principal to Engineer
GE Aviation
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ayo.brimmo
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Joined: 01 Jul 2013
Posts: 38
Location: Masdar City, Abu Dhabi

PostPosted: Mon Apr 14, 2014 10:09 am  Reply with quote

Benton,

You have to be a little more specific about your problem. What errors are you getting? How do you know the meshing is not correct??

Plus it's a xansys netiquette to include your affiliation in your signature.

Best,
Ayo Brimmo
Masdar, UAE

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of benton.allen
Sent: Monday, April 14, 2014 8:40 PM
To: xansys@xansys.org
Subject: [Xansys] Shell and Tubbe Heat Exchanger Design - Fluent

Hello Community,

I am new to ANSYS and have been commissioned to design a modified shell and tube heat exchanger. Basically, it is an oil tank with an inlet and outlet at specific pressures. Then, the tank will have a number of open air tubes running through its length in order to cool the oil while it is in the tank. I am having trouble getting the tanks I have designed to be analyzed in Fluent (the meshing is not correct and I keep getting errors). So, I am wondering if anyone has some advice for A) the best way to design the tank, and B) how to analyze the system in fluent. I am doing my best to teach the system to myself but have been having a hard time finding reference material. Any help you could throw my way would be greatly appreciated.

Best,
Benton Allen






+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
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Ayo Brimmo
Research Engineer
Masdar Institute of Science and Technology
UAE.
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benton.allen
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Joined: 09 Apr 2014
Posts: 2

PostPosted: Mon Apr 14, 2014 10:38 am  Reply with quote

Osman,

Thanks for the information! I will reference some HE Design textbooks.


Benton Allen
West Texas A&M University
Cell: (806) 674-5807
bfallen1@buffs.wtamu.edu

On Apr 14, 2014, at 12:03 PM, Buyukisik, Osman (GE Aviation, US) <osman.buyukisik@ge.com> wrote:

Quote:
Benton,
Don't use conjugate CFD to design a heat exchanger. Just look it up in the undergrad heat transfer books. You really have to be familiar with CFD in order to do it using Fluent. Also it will take quite a bit longer than doing it by hand. Since you are affiliated with wtamu , go to the library look for "heat transfer pocket handbook". Any of the graduate heat transfer books will also have it.
N.B. Include your affiliation in your sig per the mail list requirements.

Osman Buyukisik
GE Aviation
Product Engineering Center - LPT/MS

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of benton.allen
Sent: Monday, April 14, 2014 12:40 PM
To: xansys@xansys.org
Subject: [Xansys] Shell and Tubbe Heat Exchanger Design - Fluent

Hello Community,

I am new to ANSYS and have been commissioned to design a modified shell and tube heat exchanger. Basically, it is an oil tank with an inlet and outlet at specific pressures. Then, the tank will have a number of open air tubes running through its length in order to cool the oil while it is in the tank. I am having trouble getting the tanks I have designed to be analyzed in Fluent (the meshing is not correct and I keep getting errors). So, I am wondering if anyone has some advice for A) the best way to design the tank, and B) how to analyze the system in fluent. I am doing my best to teach the system to myself but have been having a hard time finding reference material. Any help you could throw my way would be greatly appreciated.

Best,
Benton Allen






+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+
+-------------------------------------------------------------+
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| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+






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christopher.wright
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Joined: 17 Jun 2009
Posts: 927

PostPosted: Mon Apr 14, 2014 3:02 pm  Reply with quote

On Apr 14, 2014, at 12:37 PM, Benton Allen wrote:

Quote:
Thanks for the information! I will reference some HE Design
textbooks.

At some point you'll like be made aware of the need to comply with
the ASME pressure vessel codes as well. You should embrace the
opportunity to avoid using ANSYS for pressure vessel design until
you're familiar enough with the Code to know how to apply FEA to its
principles.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania
1864)
http://www.skypoint.com/members/chrisw/



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ayo.brimmo
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Joined: 01 Jul 2013
Posts: 38
Location: Masdar City, Abu Dhabi

PostPosted: Mon Apr 14, 2014 4:39 pm  Reply with quote

Just remembered I did some models of this a while back. Dug up the results and it turned out that in comparison to empirical correlation in Incopera my comsol model were more accurate than fluent. Couldn't figure out why though.

The major issue you might encounter in fluent is dealing with the tube's interface with both fluids. Try look at a tutorial that treats heat transfer from solid to fluid before attempting to creating the actual model.

Best,
Ayo Brimmo
Masdar, UAE

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of benton.allen
Sent: 14 April 2014 20:40
To: xansys@xansys.org
Subject: [Xansys] Shell and Tubbe Heat Exchanger Design - Fluent

Hello Community,

I am new to ANSYS and have been commissioned to design a modified shell and tube heat exchanger. Basically, it is an oil tank with an inlet and outlet at specific pressures. Then, the tank will have a number of open air tubes running through its length in order to cool the oil while it is in the tank. I am having trouble getting the tanks I have designed to be analyzed in Fluent (the meshing is not correct and I keep getting errors). So, I am wondering if anyone has some advice for A) the best way to design the tank, and B) how to analyze the system in fluent. I am doing my best to teach the system to myself but have been having a hard time finding reference material. Any help you could throw my way would be greatly appreciated.

Best,
Benton Allen






+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+

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_________________
Ayo Brimmo
Research Engineer
Masdar Institute of Science and Technology
UAE.
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