Question

Please estimate the initial cooling rate from a cylindrical drink can, which is initially at 35 C, in a refrigerator at 5 C, for two configurations: (a) the can is put vertically, (b) the can is put horizontally. Assuming that the diameter and height of the can are 6 cm and 12 cm, respectively. Neglect the possible heat transfer from end surfaces. (20%) Hint: You may use the Churchill and Chu's correlation to evaluate the heat transfer coefficient due to natural convection. (a) Vertical surface: 0.387 Ral62 1/6 NuL = 10.825 + (0.492/Pr)9n)8/27 (b) For horizontal cylinder:

Answer 1

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