1. A hollow tube is designed to be a heater with the ability to provide uniform surface heatflux of 2000 W/m2 to the water that flows in it. The water with a velocity of0.3 mis entersthe tube at a temperature of 15 °C and leaves the tube at a temperature of 45 °C. The tubeis 13 m long with a diameter of 5 mm.a.is the flow laminar or turbulent?b.Is the flow fully developed? Prove it with appropriate calculation.c. Calculate the heat transfer coefficient for water that flows inside the pipe.d. What is the temperature of the surface at the exit point of the tube?,e. Evaluate the heat transfer performance when the velocity of water increases to 3 m/s.Briefly discuss your answer.2. The double pipe, parallel flow heat exchanger is to be used to cool oil using sea water. Theoil enter the heat exchanger at 0.15 kg/s and at a temperature of 90 °C. Meanwhile, the seawater enters the heat exchanger at 0.3 kg/sand at a temperature of 10 °C. The area of theheat exchanger is 11. 5 m2 and the overall heat transfer coefficient is 21.9 W/m2.K. Whatare the exit temperatures of the sea water and the oil from the heat exchanger? Take oil,Cp=2131 J/kg-K and sea water, Cp=4178 J/kg.K.3. Explain how to determine the radiation energy emitted by a blackbody per unit area over aspecific wavelength band, says from A,= 0 μm to x µm? Use figure to illustrate youranswer.

a) To determine if the flow is laminar or turbulent, we can calculate the Reynolds number (Re). The…

1. A hollow tube is designed to be a heater with the ability to provide uniform surface heat flux of 2000 W/m2 to the water that flows in it. The water with a velocity of0.3 mis enters the tube at a temperature of 15 °C and leaves the tube at a temperature of 45 °C. The tube is 13 m long with a diameter of 5 mm. is the flow laminar or turbulent? a. b. Is the flow fully developed? Prove it with appropriate calculation. c. Calculate the heat transfer coefficient for water that flows inside the pipe. d. What is the temperature of the surface at the exit point of the tube?, e. Evaluate the heat transfer performance when the velocity of water increases to 3 m/s. Briefly discuss your answer.

1. A hollow tube is designed to be a heater with the ability to provide uniform surface heat flux of 2000 W/m2 to the water that flows in it. The water with a velocity of0.3 mis enters the tube at a temperature of 15 °C and leaves the tube at a temperature of 45 °C. The tube is 13 m long with a diameter of 5 mm. is the flow laminar or turbulent? a. b. Is the flow fully developed? Prove it with appropriate calculation. c. Calculate the heat transfer coefficient for water that flows inside the pipe. d. What is the temperature of the surface at the exit point of the tube?, e. Evaluate the heat transfer performance when the velocity of water increases to 3 m/s. Briefly discuss your answer.

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 6.40P

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