PROBLEM 1 Convection Heat Transfer Analysis (15 pts) In the convection heat transfer lab, the ambient air at 15°C and 1

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Problem 1 Convection Heat Transfer Analysis 15 Pts In The Convection Heat Transfer Lab The Ambient Air At 15 C And 1 1 (99.2 KiB) Viewed 35 times

PROBLEM 1 Convection Heat Transfer Analysis (15 pts) In the convection heat transfer lab, the ambient air at 15°C and 1 atm flows in a pipe of 1 cm inner diameter and uniformly heated by induction heating. The air temperature and the inner wall temperature are measured at various locations along the pipe under both laminar and turbulent flow conditions. Flow rate Cable T@ 0 mm [C] T@ 100 mm [C] T@ 1000 mm [C]T@ 1500 mm [C] Heater [L/min] Tums Air Wall Air Wall Air Wall Air Wall Volt V Amp [A] Laminar 10 2 15 3 Turbulent 80 3 100 4 120 5 Convection in laminar flow 1. Determine the convection heat transfer coefficient, hm, using the air temperature and the wall temperature measured at 1 m and 1.5 m. Report Reynolds number using gas properties at the average flow temperature. Assume uniform wall heat flux over 1-1.5 m. (2 pts) 2. Calculate the convection heat transfer coefficient, hc, using the equation in Chapter 7. (1 pt) 3. Compare hm and he. Does the theory for internal convection of laminar flow work? (2 pts) Convection in turbulent flow 4. Determine the convection heat transfer coefficient, hm, using the air temperature and the wall temperature measured at 1 m and 1.5 m. Report Reynolds number using gas properties at the average flow temperature. Assume uniform wall heat flux over 1-1.5 m. (2 pts) 5. Calculate the convection heat transfer coefficient, hc, using the equation in Chapter 7. (1 pt) 6. Compare hm and hc. Does the theory for internal convection of turbulent flow work? (2 pts) Temperature distribution along the flow 7. Plot the air and wall temperatures along the flow for the laminar case with 15 L/min and for the turbulent case with 120 L/min. Discuss the temperature distribution of each case and compare the two cases. (3 pts) 8. Discuss whether the pipe is well insulated. (2 pts)