Consider a thin-walled tube of 10 mm diameter and 2 m length. Water enters the tube from a large reservoir at m = 0.2 kg/s and Tm,i = 47°C. (a) If the tube surface is maintained at a uniform temperature of 27°C, what is the outlet temperature of the water, Tm,o? To obtain the properties of water, assume an average mean temperature of Tm = 300 K. (b) What is the exit temperature of the water if it is heated by passing air at T = 100°C and V = 10 m/s in cross flow over the tube? The properties of air may be evaluated at an assumed film temperature of Trim = 350 K. To obtain the heat transfer coefficients, use Dittus - Boelter correlation for internal flow and the correlation for flow around cylinder as given in previous HW.

Elements Of Electromagnetics
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5. Consider a thin-walled tube of 10 mm diameter and 2 m length. Water enters the tube
from a large reservoir at m = 0.2 kg/s and Tm,i = 47°C. (a) If the tube surface is maintained
at a uniform temperature of 27°C, what is the outlet temperature of the water, Tm,o? To
obtain the properties of water, assume an average mean temperature of Tm = 300 K. (b)
What is the exit temperature of the water if it is heated by passing air at T = 100°C and V
= 10 m/s in cross flow over the tube? The properties of air may be evaluated at an
assumed film temperature of Tfilm = 350 K. To obtain the heat transfer coefficients, use
Dittus - Boelter correlation for internal flow and the correlation for flow around cylinder
as given in previous HW.
Transcribed Image Text:5. Consider a thin-walled tube of 10 mm diameter and 2 m length. Water enters the tube from a large reservoir at m = 0.2 kg/s and Tm,i = 47°C. (a) If the tube surface is maintained at a uniform temperature of 27°C, what is the outlet temperature of the water, Tm,o? To obtain the properties of water, assume an average mean temperature of Tm = 300 K. (b) What is the exit temperature of the water if it is heated by passing air at T = 100°C and V = 10 m/s in cross flow over the tube? The properties of air may be evaluated at an assumed film temperature of Tfilm = 350 K. To obtain the heat transfer coefficients, use Dittus - Boelter correlation for internal flow and the correlation for flow around cylinder as given in previous HW.
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