Air at p = 1 atm enters a thin-walled (D = 5-mm diameter) long tube (L = 2 m) at an inlet temperature of Tm₂ 100°C. A constant heat flux is applied to the air from the tube surface. The air mass flow rate is m = 105 x 10" the tube surface temperature at the exit is Ts,o= 160°C, determine the heat rate entering the tube, in W. Evalua properties at T = 400 K. q= W

Air at p = 1 atm enters a thin-walled (D = 5-mm diameter) long tube (L = 2 m) at an inlet temperature of Tm₂ 100°C. A constant heat flux is applied to the air from the tube surface. The air mass flow rate is m = 105 x 10" the tube surface temperature at the exit is Ts,o= 160°C, determine the heat rate entering the tube, in W. Evalua properties at T = 400 K. q= W

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.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.32P

See similar textbooks

Similar questions

6.1 Determine the heat transfer coefficient at the stagnation point and the average value of the heat transfer coefficient for a single 5-cm-OD, 60-cm-long tube in cross-flow. The temperature of the tube surface is , the velocity of the fluid flowing perpendicular to the tube axis is 6 m/s, and the temperature of the fluid is . Consider the following fluids: (a) air, (b) hydrogen, and (c) water.
Fluid flows at an ambient temperature of 87 oC at a speed of 0.4 m/s through a smooth pipe with a diameter of 20 mm, a length of 24 m and placed horizontally, and heats a medium. Considering that the pipe surface temperature remains constant, inside the pipe; a) In case of water flow,b) In case of engine oil leakage Calculate the heat transfer coefficient and the friction factor in the in-pipe flow and compare and interpret the results.
A constant heat flux q = 200 W / m2 is applied to a circular section pipe with a diameter D = 50 mm and a length L = 8 m, and water flows at a flow of 0.01 kg / s under the pipe. The entrance temperature of the water to the pipe is 29 oC. Which of the following is the average fluid temperature at the outlet of the pipe (x = L) with the fluid transmission at 30 oC? a. 39.21 oC b. 84,23 oC c. 66,59 oC D. 61.43 oC e. 83,28 oC
Heat transfers Air is to be heated from 15 C to 270 C, as it flows through a tube 25mm diameter at average velocity 30 m/s. The tube surface is maintained at 280 C and the air is to be provided at rate 0.013 kg/s. Take the water properties k=0.0336 W/m.C , υ = 25.9× 10-6 m2/s , Cp=1.014 kJ/kg.C , ρ = 0.8826 kg/ m3 , Pr=0.689 . Determine the following The necessary tube length Heat transfer coefficient Heat transfer rate
What is the value of the heat transfer coefficient for air at 37 ° C flowing at 5 m / s perpendicular to a 10 cm x 10 cm square pipe at 93 ° C? h = 23kcal / hm ^ 2 ° C around this value
Engine oil flows through a 50 mm diameter tube at an average temperature of147°C. The flow velocity is 80 cm/s. Calculate the average heat transfer coefficient if the tube wall is maintained at a temperature of 200°C and it is 2 m long. Hint: Area can be assumed to be equal to the vertical projectiion of the tube , i.e. LD. Ans.: h = 377.36 W/m2.K . Draw an illustration. Note: use the formula on the picture