Water enters a tube of D=5-cm in diameter at Tm,=21°C with a flowrate of rm=0.18- kg/min. The tube is wrapped with a resistance heater pad providing a constant heat flux of q!=2.4-kW/m?. Assuming that the flow is both hydrodynamically and thermally full developed, determine the length of the tube (in meters) required to heat the water to Tm,o=123°C.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Water enters a tube of D=5-cm in diameter at Tmi=21°C with a flowrate of m=0.18-
kg/min. The tube is wrapped with a resistance heater pad providing a constant heat flux
of q'=2.4-kW/m?. Assuming that the flow is both hydrodynamically and thermally full
developed, determine the length of the tube (in meters) required to heat the water to
m,0=123 °C.
Use the following.properties for the mean temperature of water:
p=970.87 kg/m³, p=343×106N-s/m2 , k=0.671 W/m-K, cp=4200 J/kg-K, Pr=2.14.
Transcribed Image Text:Water enters a tube of D=5-cm in diameter at Tmi=21°C with a flowrate of m=0.18- kg/min. The tube is wrapped with a resistance heater pad providing a constant heat flux of q'=2.4-kW/m?. Assuming that the flow is both hydrodynamically and thermally full developed, determine the length of the tube (in meters) required to heat the water to m,0=123 °C. Use the following.properties for the mean temperature of water: p=970.87 kg/m³, p=343×106N-s/m2 , k=0.671 W/m-K, cp=4200 J/kg-K, Pr=2.14.
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