Heated water at 65C is flowing at 0.20 m/s inside of a steel pipe with internal...

 

Transcribed Image Text:

Heated water at 65C is flowing at 0.20 m/s inside of a steel pipe with internal diameter of 2.5 cm and external diameter 3.0 cm. Cool air at 12C is blowing perpendicular to the outside of the pipe at a velocity of 20 m/s. a. What is the convection coefficient for heat transfer from the water to the wall of the pipe? You can assume that the flow is fully-developed. b. What is the convection coefficient for heat transfer from the wall of the pipe into the air? C. What is the overall heat transfer coefficient (based on external pipe area) for this heat exchanger? Which layer (water or air) contributes the largest thermal resistance for heat transfer in this case? d. What is the heat flux (based on external pipe area)? Heated water at 65C is flowing at 0.20 m/s inside of a steel pipe with internal diameter of 2.5 cm and external diameter 3.0 cm. Cool air at 12C is blowing perpendicular to the outside of the pipe at a velocity of 20 m/s. a. What is the convection coefficient for heat transfer from the water to the wall of the pipe? You can assume that the flow is fully-developed. b. What is the convection coefficient for heat transfer from the wall of the pipe into the air? C. What is the overall heat transfer coefficient (based on external pipe area) for this heat exchanger? Which layer (water or air) contributes the largest thermal resistance for heat transfer in this case? d. What is the heat flux (based on external pipe area)?