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Heat Ex-changer Meshing and BC Setups

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Old   November 23, 2017, 10:09
Default Heat Ex-changer Meshing and BC Setups
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sivakumar selvaraju
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Hi CFD Experts,
Currently I started working on the heat ex-changer.

I have attached the figure for reference, please have a look and help me to sort out the problem.

I have few questions,

In actual there are two zones first one is hot fluid ( exhaust gas ), second one is coolant (water).

I am using Gambit for meshing (95 % Hex mesh). the issue what i am facing is that,
1) is there any special way to treat this two zones in Gambit?
I have defined zones in Gambit, but in fluent I unable to see them.
2) In my case I have extended surfaces (fins), how to treat them? I have given it as wall.
3) Also I need to know, how to separate them (two zones)

If anybody is interested to see the mesh, I can send the link.

Please have a look at the fig, and help me to solve it.

Thanks,
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File Type: jpg IMG-20170927-WA0005.jpg (53.1 KB, 8 views)
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Old   December 4, 2017, 12:09
Default Heat Exchanger issue
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sivakumar selvaraju
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Hi All,
I tried to fix the problem which I posted early, but no success.
The problem what I want to solve is Engine exhaust heat ex-changer
I am using Gambit for pre processing, Ansys 17.2 for processing
Pre processing

I defined 3 zones i) hot fluid ii) cold fluid iii) Fins
the mesh is good enough for initial stage.

hot fluid - Fluid zone
cold Fluid - Fluid zone
Fins - Wall

it is a counter flow HE,

I couldn't see the cold fluid moments and temperature distribution.
I am not sure where i am doing mistake.

I kindly request the heat transfer experts please help me to solve the problem.

I have attached the case for your check.

Please find the case folder in the below link

https://www.sendspace.com/file/nw4t70


Thanks,
Sivakumar
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Old   May 14, 2018, 05:59
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utkucancolak
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Hello
I want to do an evaporator analysis.(cooling) In this study improving thermal performance and heat transfer effectiveness.(fin pitch,fin thickness,tube diameter of tubes)
Water inlet temperature 14 degrees
Water outlet temperature 20 degrees
Velocity1.0933 Kg / s
Air Inlet Temperature 38 degrees
Air outlet temperature 16.6 degrees
Velocity 4.45 m / s
Fin pitch: 1.8mm
Fin Thickness: 0.12mm
Coil Lenght 1665mm
I save the file solidworks step. Then I make boolean subtract air and evaporator(Shell preserve yes). 3 part (air,water,shell) Shell=evaporatar
1)Shell water
2)Shell air
3)Water air I delete this contact because not mix air and water
How can I reduce mesh number? Do I something else wrong during this time.Could you help me?</SPAN>
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