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Old   September 17, 2014, 03:09
Default Offset strip Fin_validation
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Tae Kyeong Lee
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Hi, I'm Tae Kyeong Lee from Republic of Korea.

I have a problem w/ validation for offset strip fin.

Actually, I read the paper written by Manglik(1995) and Kwan Soo Lee(2010), but I can't get a same tendency.

In Reynolds number = 500~600, it seems quite in accordance with papers.

But, Lower than Re=500, j factor looks higher than it in paper.

and Higher than Re=600, j factor is lower than it in paper.

boundary condition is like ,

velocity inlet, pressure outlet, periodic condition at both sides,

top and bottom is wall, constant temperature.

I used the same hydraulic diameter w/ papers and Nusselt number is also

considered by hydraulic diameter.

I use the mean velocity at fin inet and fin outlet to get a reynolds number.

F factors are almost in accordance w/ papers.

What should I consider about it?

Thx to read it. And If you get a solution or advice, I'll be grateful.
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Old   September 17, 2014, 03:14
Default Addition information
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Tae Kyeong Lee
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wall constant temperature is 380K. and Inlet temperature is 300K.

In Re=500, outlet air temperature is 379.1261K and Re=400, 379.0879K

Re=300, 379.7462K

fin's alpah = 05, sigma=0.033, gamma = 0.0833 Dh=0.001557(m)

should I set the air wall (at fin top and bottom) in adiabatic?
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