We wish to use the analytical model developed by Joshi and Webb to predict the heattransfer and friction characteristics (j and f) of the Offset Strip-Fin (OSF) array.Surface18α0.1230.2240.0160.064h (mm)38.138.1t (mm) Dh (mm)0.4067.5181.62610.8970.05510.04342. Use the Webb and Joshi model given in the notes to make a plot of Nu versusthe fin length (1) for 1 mm < 1 < 5 mm. You should use 0.5 mm incrementsof 1 or smaller. Use α= 0.184, t =0.102 mm, h = 4.98 mm, and Reph = 500.Explain why the Nu behaves as it does with respect to 1. Assume that the finefficiency is equal to 1.3. Convert the Nu data that you generated in Problem 2 above into j-factors byassuming that Pr = 0.7. Next calculate the friction factor for the samevalues of 1, the same Reph, and for the same geometric parameters as Problem2. Plot flj versus the fin length (1) for 1 mm <5 mm. Does your plotverify the Reynolds analogy for this case? Explain why this should beexpected. SLpFigure 5.7 Unit cell used to derive the Joshi and Webb[1987] analytical model for the OSF.

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S Lp Figure 5.7 Unit cell used to derive the Joshi and Webl [1987]analytical model for the OSE

Elements Of Electromagnetics

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Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.

Question

We wish to use the analytical model developed by Joshi and Webb to predict the heat
transfer and friction characteristics (j and f) of the Offset Strip-Fin (OSF) array.
Surface
1
8
α
0.123
0.224
0.016
0.064
h (mm)
38.1
38.1
t (mm) Dh (mm)
0.406
7.518
1.626
10.897
0.0551
0.0434
2. Use the Webb and Joshi model given in the notes to make a plot of Nu versus
the fin length (1) for 1 mm < 1 < 5 mm. You should use 0.5 mm increments
of 1 or smaller. Use α= 0.184, t =0.102 mm, h = 4.98 mm, and Reph = 500.
Explain why the Nu behaves as it does with respect to 1. Assume that the fin
efficiency is equal to 1.
3. Convert the Nu data that you generated in Problem 2 above into j-factors by
assuming that Pr = 0.7. Next calculate the friction factor for the same
values of 1, the same Reph, and for the same geometric parameters as Problem
2. Plot flj versus the fin length (1) for 1 mm </<5 mm. Does your plot
verify the Reynolds analogy for this case? Explain why this should be
expected.

S
Lp
Figure 5.7 Unit cell used to derive the Joshi and Webb
[1987] analytical model for the OSF.

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