A). A 6.0 inch O.D tube with a wall thickness of 0.10 inch and an axial...

 

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A). A 6.0 inch O.D tube with a wall thickness of 0.10 inch and an axial length of 20 feet is located in a closed room. The tube is electrically heated and, at steady state, loses energy to its surroundings at the rate of 1,000 W/ft. Determine the rate of thermal energy loss in Btu/hr. B). In a chemical process, oil is flowing through a 2 inch I.D. iron pipe at a velocity of 3 ft/sec. The properties of the oil are; Density = 55 lbm/ft³, Heat capacity=0.518 Btu/lbm-F. Viscosity=5.08 lbm/ft-hr Conductivity = 2.17 x 10-5 Btu/sec-ft-F. Calculate the Prandtl number for this specific flow situation. A). A 6.0 inch O.D tube with a wall thickness of 0.10 inch and an axial length of 20 feet is located in a closed room. The tube is electrically heated and, at steady state, loses energy to its surroundings at the rate of 1,000 W/ft. Determine the rate of thermal energy loss in Btu/hr. B). In a chemical process, oil is flowing through a 2 inch I.D. iron pipe at a velocity of 3 ft/sec. The properties of the oil are; Density = 55 lbm/ft³, Heat capacity=0.518 Btu/lbm-F. Viscosity=5.08 lbm/ft-hr Conductivity = 2.17 x 10-5 Btu/sec-ft-F. Calculate the Prandtl number for this specific flow situation.

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