Answered: ater flowing at 0.1 kg/s through a…

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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Water flowing at 0.1 kg/s through a thin-walled 50-mm diameter pipe is cooled from 400 K to 300 K. Calculate the required length of pipe if the outside coolant moving cross ways over the pipe is atmospheric air at 250 K moving at 20 m/s.

Assume properties are:

Water: (k = 0.668 W/m K, density = 974 kg/m^3, Pr = 2.29, v = 3.75*10^-7 m^2/s, C_p = 4195 J/kg K).

Air: (k = 0.0263 W/m K, Pr = 0.707, v = 15.89*10^-6 m^2/s).

1. For the above problem the inside pipe heat transfer coefficient h_in=____ W/m^2 K.

a) 422

b) 451

c) 185

d) 493

e) 79

2. For the above problem the outside pipe heat transfer coefficient h_out=____W/m^2 K.

a) 126

b) 55

c) 238

d) 83

e) 326

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