Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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In the effort to find the best way to cool a smooth thin-walled copper tube, an engineer decided to flow air either through the tube or across the outer tube surface. The tube has a diameter of 6 cm, and the surface temperature is maintained constant.
Determine the convection heat transfer coefficient when air is flowing through a thin-walled tube at 25 m/s with bulk mean temperature of 50°C.
_____ w/m^2k
A 50-cm diameter pipeline in the Arctic carries hot oil where the outer surface is maintained at 30 °C and is exposed to a surrounding temperature of -17 °C. The convection heat-transfer coefficient on the outside of the pipe is 9 W/m2 °C. Estimate the energy loss from the pipe per meter of length.
Estimate the natural convection heat transfer coefficient of the horizontal pipe. The outer surface temperature of the pipe is 80 ° C. The ambient air temperature is 40 ° C. The outer diameter of the pipe is 18 cm. Convection coefficient = Answer W / m² ° C.
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- 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.arrow_forwardIn the effort to find the best way to cool a smooth thin-walled copper tube, an engineer decided to flow air either through the tube or across the outer tube surface. The tube has a diameter of 5 cm, and the surface temperature is maintained constant. Determine (a) the convection heat transfer coefficient when air is flowing through its inside at 25 m/s with bulk mean temperature of 50°C and (b) the convection heat transfer coefficient when air is flowing across its outer surface at 25 m/s with film temperature of 50°C.arrow_forwardHot air leaving the stove in the kitchen of a house at 70 0C, with a square section of 22 cm x 22 cm.sheet metal enters the 12 m long section of the channel with a speed of 6 m/s. Emissivity 0.3The outer surface of the duct, whose thermal resistance is neglected, is located in the basement of the house at 14 0C and 12 W/m2.It is in contact with cold air with 0C convection heat transfer coefficient. Basementtaking the wall temperatures of the floor to 14 0C.Find the rate of heat loss from the hot air in the duct to the floor.arrow_forward
- Q3: Air flows across a 20-cm-square plate with a velocity of $ m/s. Free-stream conditions are 10-C and 0.2 atm. A heater in the plate surface furnishes a constant heat-flux condition at the wall so that the average wall temperature is 100-C. Calculate the surface heat flux and the value of h at an x position of 10 cm. Answers: Q= 1414 W, b= 13.3 Wm?.Carrow_forwardAir at 350C flows across a cylinder of 50 mm diameter at a velocity of 50 m/s. The cylinder surface is maintained at 1450C. Determine the heat loss per unit length of the cylinder. Use Nu = 0.0266 Re 0.8 Pr 0.3arrow_forwardEngine oil at 54oC54oC flows over the upper surface of a 5m5m long plate whose temperature is 20oC20oC with a velocity of 2m/s2m/s. What is the heat transfer rate per unit width of the plate?arrow_forward
- Water at a temperature of 25oC flows parallel over a flat plate with free-stream velocity of 2 m/s. The plate surface temperature is uniform at 86oC. Calculate: a) Thermal boundary layer thickness at x = 8 cm from leading edge; b) Local heat flux on x = 8 cm from leading edge; c) Total heat transfer rate in the area of plate L = 8 cm from the leading edge and width w = 10 cm.arrow_forwardHot exhaust gases leaving a stationary diesel engine at450°C enter a l5-cm-diameter pipe at an average velocity of3.6 m/s. The surface temperature of the pipe is 180°C. Deter-mine the pipe length if the exhaust gases are to leave the pipeat 250°C after transferring heat to water in a heat recovery unit.Use properties of air for exhaust gases.arrow_forwardConsider a house that is maintained at a constanttemperature of 22°C. One of the walls of the house has threesingle-pane glass windows that are 1.5 m high and 1.8 mlong. The glass (k = 0.78 W/m·K) is 0.5 cm thick, and theheat transfer coefficient on the inner surface of the glass is8 W/m2·K. Now winds at 35 km/h start to blow parallel to thesurface of this wall. If the air temperature outside is -2°C,determine the rate of heat loss through the windows of thiswall. Assume radiation heat transfer to be negligible. Evaluatethe air properties at a film temperature of 5°C and 1 atm.arrow_forward
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