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

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 1.23P: Using the information in Problem 1.22, estimate the ambient air temperature that could cause...

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Using the information in Problem 1.22, estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes. 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35W/mKis35C and the air temperature is 20C. Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about 20W/m2K (see Table 1.4), but in a 40-mph wind it increases to 75W/m2K. If frostbite occurs when the skin temperature drops to about 10C, do you advise the skier to wear a face mask? What is the skin temperature drop due to the wind?
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Differantial Equations