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Heat transfer analysis of heat exchanger with complicated shape and irregular fins |
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September 28, 2016, 07:28 |
Heat transfer analysis of heat exchanger with complicated shape and irregular fins
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#1 |
New Member
Join Date: Sep 2015
Location: South Korea
Posts: 4
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Hi all,
I am working on a project in which I have to discuss the heat transfer characteristics of complicated heat exchanger which has varying diameter with irregular fins outside and inside. (I have three fluids and one solid heat exchanger). I tried earlier discussions and other books/documentation. But it seems very confusing. I have couple of doubts. 1) how to calculate the Reynolds number for this case? I know, Velocity scale = areaAve(Velocity)@inlet Length scale = the diameter of the cylinder or chord length density scale = areaAve(Density)@inlet Viscosity scale = areaAve(Viscosity)@inlet But, how to calculate characteristic length in this case. 2) How to calculate Nusselt number, heat transfer coefficient and heat transfer rate with varying Reynolds number? (This seems complicated due to complexity of geometry) Thanks, Mahesh Last edited by Mahesh Patil; September 28, 2016 at 07:30. Reason: missed one important factor |
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September 29, 2016, 12:07 |
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#2 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,184
Rep Power: 23 |
See the FAQ for some general info on HTC and Nusselt calcs if you have not already:
http://www.cfd-online.com/Wiki/Ansys...ficient_in_CFX You can pic any length scale you want, it is somewhat arbitrary for complex geometry. Diameter of tubes is appropriate for internal flows. |
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cfx, heat transfer coefficeint, heat transfer rate, nusselt number, reynolds number |
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