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November 6, 2022, 13:32 |
Reynolds number for tube bank
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#1 |
New Member
StanPH
Join Date: Oct 2022
Location: Slovakia
Posts: 2
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Dear all,
I'm doing heat transfer simulations of an in-line tube bank that has cylindrical tubes. When reading articles, some authors compute the Reynolds number based on the tube diameter and maximum velocity between the tubes. Other authors use inlet velocity and some of them compute the Reynolds number based on the inlet hydraulic diameter. How can I find out if there is "low" or "high" Re to choose appropriate computational model? Re based on the tube diameter and maximum velocity can be "low", while Re based on the inlet parameters can be "high" at the same physical parameters. Thank you. |
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November 6, 2022, 14:14 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73 |
Quote:
All choices produce a congruent non dimensional Re number. The key is to use the correct characteristic lenght and velocity that make the term in the non dimensional equation of O(1). In principle, the mean inlet velocity and the diameter of the tube would produce the correct Re number. |
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November 9, 2022, 12:21 |
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#3 | |
New Member
StanPH
Join Date: Oct 2022
Location: Slovakia
Posts: 2
Rep Power: 0 |
Quote:
Thank you. Is the mentioned approach applicable also for a channel with tubes inside? What if the tubes have different diameters? |
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November 9, 2022, 12:55 |
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#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73 |
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Tags |
hydraulic diameter, reynolds number, tube bank |
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