ater 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).
ater 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).
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.
Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.15P
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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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