9-94 A hot liquid (c, = 950 J/kg-K) flows at a flow rate PtD of 0.005 kg/s inside a tube with a diameter of 25 mm. At the tube exit, the liquid temperature decreases by 8°C from its temperature at the inlet. The hot liquid causes the tube surface temperature to be 120°C. To prevent thermal burn hazards, the tube is enclosed with a concentric outer cover of 5 cm in diameter. Determine whether the outer cover temperature is below 45°C to prevent thermal burns in contact with human skin. Evaluate the properties of air in the concentric enclosure at 80°C and 1 atm pressure. Is this a good assumption? Outer cover at T,

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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9-94
A hot liquid (c, = 950 J/kg-K) flows at a flow rate
PtD
%3D
of 0.005 kg/s inside a tube with a diameter of
25 mm. At the tube exit, the liquid temperature decreases by
8°C from its temperature at the inlet. The hot liquid causes the
tube surface temperature to be 120°C. To prevent thermal
burn hazards, the tube is enclosed with a concentric outer
cover of 5 cm in diameter. Determine whether the outer cover
temperature is below 45°C to prevent thermal burns in contact
with human skin. Evaluate the properties of air in the
concentric enclosure at 80°C and 1 atm pressure. Is this a
good assumption?
Outer cover at T
D;
D.
Tube at T;
FIGURE P9-94
Transcribed Image Text:9-94 A hot liquid (c, = 950 J/kg-K) flows at a flow rate PtD %3D of 0.005 kg/s inside a tube with a diameter of 25 mm. At the tube exit, the liquid temperature decreases by 8°C from its temperature at the inlet. The hot liquid causes the tube surface temperature to be 120°C. To prevent thermal burn hazards, the tube is enclosed with a concentric outer cover of 5 cm in diameter. Determine whether the outer cover temperature is below 45°C to prevent thermal burns in contact with human skin. Evaluate the properties of air in the concentric enclosure at 80°C and 1 atm pressure. Is this a good assumption? Outer cover at T D; D. Tube at T; FIGURE P9-94
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