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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) 0.406 1.626 Dh (mm) 7.518 10.897 0.0551 0.0434

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) 0.406 1.626 Dh (mm) 7.518 10.897 0.0551 0.0434

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.15P: 1.15 A thermocouple (0.8-mm-diameter wire) used to measure the temperature of the quiescent gas in a...
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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.
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.
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