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simulation in laminar convective heat transfer

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Old   December 12, 2017, 21:00
Default simulation in laminar convective heat transfer
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Dear all,

I am sorry to ask silly question. I am trying to simulate convective heat transfer in laminar flow by Using Ansys FLUENT 17.2.
Here is some details

•Plain tube
•Laminar flow (Velocity: 0.01209669 m/s)
•Working fluid: water liquid
•Internal diameter tube=15.88 mm
•Tube length =8.02 m (7.9 m is entrance region and 0.12 m is the test section)
•Inlet Temperature = 27 C
•Wall Temperature = 17 C
•Reference Temperature = Film Temperature = 22 C
•All Properties are calculated at Film Temperature

But the result is not good. The velocity and temperature profile should be parabolic. I attach some of results.

Do you have any suggestion?

Thank you so much
Attached Images
File Type: jpg mesh cross section.jpg (64.1 KB, 8 views)
File Type: jpg pressure grad.jpg (39.0 KB, 12 views)
File Type: jpg Surf-nusselt.jpg (39.8 KB, 7 views)
File Type: jpg temperature.jpg (51.2 KB, 9 views)
File Type: jpg velocity-y.jpg (53.2 KB, 6 views)
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heat transfer, laminar, plain pipe

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