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

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

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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.
Transcribed Image Text: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.
Transcribed Image Text:S Lp Figure 5.7 Unit cell used to derive the Joshi and Webb [1987] analytical model for the OSF.
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