Air at 2 bar and 40°C is heated as it flows through tube of diameter 30mm at a velocity of 10 m/s. Calculate the heat transfer per unit length of the tube when wall temperature is maintained at 100° C all along length of the tube. How much would be the bulk temperature increase over one metre length of the tube ? Use the following relation : Nu = 0.023 Re8 P4 u = 20.6 x 106 N- s/m2: Pr = 0.694 c, 1.009 kJ/kg°C; k = 0.0297 kg/m°C;

Air at 2 bar and 40°C is heated as it flows through tube of diameter 30mm at a velocity of 10 m/s. Calculate the heat transfer per unit length of the tube when wall temperature is maintained at 100° C all along length of the tube. How much would be the bulk temperature increase over one metre length of the tube ? Use the following relation : Nu = 0.023 Re8 P4 u = 20.6 x 106 N- s/m2: Pr = 0.694 c, 1.009 kJ/kg°C; k = 0.0297 kg/m°C;

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 7.22P

See similar textbooks

Similar questions

6.3 Steam at 100 kPa and is flowing across a 5-cm- OD tube at a velocity of 6 m/s. Estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at .
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
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.
Hot water, k=48 W/m. It flows at a speed of 1.4 m/s along the cast iron pipe at oC. The inner and outer diameters of the pipe are 3.0 and 3.5 cm, respectively. The pipe is located within 15 m of a basement with a temperature of 15 °C. If the temperature of the water drops from 70 oC to 67 oC while passing through the basement and the film heat transfer coefficient on the inner surface of the pipe is 400 W/m2. Calculate the convective heat transfer coefficient on the outer surface of the pipe and the heat to be transferred.
an oil at average temperature of 100 F flows at 1.2 ft/s velocity 0.834in inside diameter horizontal tube. The tube is heated by uniform heat flux the average surface temperature is 120F. Determine the heat transfer coefficient, Then the rate of heat transfer per length of the heating tube. Please write assumptions and do a sketch
Example 4: Hot air at atmospheric pressure and 80°C enters an 8–m-long uninsulated square duct of cross section 0.2 m  0.2 m that passes through the attic of a house at a rate of 0.15 m3/s (Figure). The duct is observed to be nearly isothermal at 60°C. Determine the exit temperature of the air and the rate of heat loss from the duct to the attic space.
Air at 1 atm and 300 °C is cooled as it flows at a velocity of 5.0 m/s through a tube with a diameter of 2.54 cm. Calculate the heat transfer coefficient if a constant heat flux condition is maintained at the wall and the wall temperature is 20 °C above the temperature along the entire length of the tube. (see attached)
Water flows through a tube of 5mm inside diameter with a volumetric flow rate of 7.8 cm3/s. Wall temperature of the tube is kept constant at 80oC. In a fully developed velocity and temperature profile region of 5m length, calculate the bulk temperature of exiting water if its inlet temperature is 20oC
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
Water at a flow rate of 0.215 kg/s is cooled from 70°C to 30°C by passing it through a thin-walled tube of diameter of 50 mm and maintaining a coolant at 15°C in cross flow over the tube. What is the required tube length if the coolant is air and its velocity is V = 20 m/s?Water : cp = 4181 J/kg⋅K, μ = 548 × 10-6 N⋅s/m2, k = 0.643 W/m⋅K, Pr = 3.56.Air : ν = 15.89 × 10-6 m2/s, k = 0.0263 W/m⋅K, Pr = 0.707.(Hint: For external flow use Churchill/Bernstein correlation.)
Hot water, k=48 W/m. It flows along the cast iron pipe, which is oC, at a speed of 1.4 m/s. The inner and outer diameter of the pipe are 3.0 and 3.5 cm, respectively. The pipe is located in a 15 m section of a basement floor with a temperature of 15 oC. If the water temperature drops from 70 OC to 67 OC when passing through the basement, and the film heat transfer coefficient on the inner surface of the pipe is 400 W/m2. If oC is, calculate the convective heat transfer coefficient on the outer surface of the pipe and the heat that will be transferred.
Water flows inside the tube 45mm diameter and 3.5 meters long at a velocity 1m/s. Determine the heat transfer coefficient and the rate of heat transfer if the mean water temperature is 50 degree celsius and the tube wall is 70 degree celsius. kfor water is 0.68W/m degree celsius and the kinematic viscocity is 0.478x10^-6 m2/s and the Pr= 2.98. use the Dittus and Boelter equation to solve for Nu.