Inconel refers to a class of nickel-chromium-based superalloys that are used in high-temperature applications, such as gas turbine blades. For further improvement in the performance of gas turbine engines, the outer blade surface is coated with ceramic-based thermal barrier coating (TBC). A flat Inconel plate with a thickness of 12 mm is coated with a layer of TBC with a thickness of 300 um on its surface. At the interface between the Inconel and the TBC, the thermal contact conductance is 3500 W/m2 K. The thermal conductivities of the Inconel and the TBC are 25 W/m K and 1.5 W/m-K, respectively. The plate is in a surrounding of hot combustion gasses at 1500'C, and the convection heat transfer coefficient is 750 W/m K. Determine the temperature at the mid-plane of the Inconel plate if the outer surface temperature is 1175°C. The temperature is 1'C.

Inconel refers to a class of nickel-chromium-based superalloys that are used in high-temperature applications, such as gas turbine blades. For further improvement in the performance of gas turbine engines, the outer blade surface is coated with ceramic-based thermal barrier coating (TBC). A flat Inconel plate with a thickness of 12 mm is coated with a layer of TBC with a thickness of 300 um on its surface. At the interface between the Inconel and the TBC, the thermal contact conductance is 3500 W/m2 K. The thermal conductivities of the Inconel and the TBC are 25 W/m K and 1.5 W/m-K, respectively. The plate is in a surrounding of hot combustion gasses at 1500'C, and the convection heat transfer coefficient is 750 W/m K. Determine the temperature at the mid-plane of the Inconel plate if the outer surface temperature is 1175°C. The temperature is 1'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.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.1DP

See similar textbooks

Similar questions

A horizontal, 3-mm-thick flat-copper plate, 1-m long and 0.5-m wide, is exposed in air at 27C to radiation from the sun. If the total rate of solar radiation absorbed is 300 W and the combined radiation and convection heat transfer coefficients on the upper and lower surfaces are 20 and 15W/m2K, respectively, determine the equilibrium temperature of the plate.
(a) If the cost of producing the hot water is $0.10 per kWh, what is the representative daily costof heat loss from an uninsulated pipe to the air per meter of pipe length? The convectionresistance associated with water flow in the pipe may be neglected.(b) Determine the savings associated with application of a 10-mm-thick coating of urethaneinsulation (k = 0.026 W/m-K) to the outer surface of the pipe.
In addition , the space between the upper cap, the lower cap, and the cylindrical wall is filled with linear insulating material of permeability u.
The emissivity of galvanized steel sheet, a common roofing material, is ε = 0.13 at temperatures around 300 K, while its absorptivity for solar irradiation is αS = 0.65. Would the neighborhood cat be comfortable walking on a roof constructed of the material on a day when GS = 750 W/m2, T∞ = 16°C, and h = 7 W/m2 · K? Assume the bottom surface of the steel is insulated.
The door of a 1 m long by 27.5 cm wide oven is made up of 2 AISI 1010 carbon steel plates of identical thickness and an 8 mm thick mineral fiber board with resin binder (intermediate plate) . the composite plate considering the three plates is 5 cm. The temperature on the inner wall of the oven is 172 ° C and the surface temperature on the oven door (outer wall) is 35 ° C. The oven door is exposed in a room where the ambient air temperature is 30 ° C. Do the following: Estimate the convective heat transfer coefficient associated with ambient air.
7: horizontal steel pipe having a diameter of 5 cm is maintained at a temperature of 50◦C in a large room where the air and wall temperature are at 20◦C. The surface emissivity of the steel may be taken as 0.8. Using the data of Table 1-3, calculate the total heat lost by the pipe per unit length.
The author and his then 6-year-old son have conducted the following experiment to determine the thermal conductivity of a hot dog. They first boiled water in a large pan and measured the temperature of the boiling water to be 94°C, which is not surprising, since they live at an elevation of about 1650 m in Reno, Nevada. They then took a hot dog that is 12.5 cm long and 2.2 cm in diameter and inserted a thermocouple into the midpoint of the hot dog and another thermocouple just under the skin. They waited until both thermocouples read 20°C, which is the ambient temperature. They then dropped the hot dog into boiling water and observed the changes in both temperatures. Exactly 2 min after the hot dog was dropped into the boiling water, they recorded the center and the surface temperatures to be 59°C and 88°C, respectively. The density of the hot dog can be taken to be 980 kg/m3, which is slightly less than the density of water, since the hot dog was observed to be floating in water while…
What is thermal conductivity? How the thermal conductivity of Solid, liquid and gases are varying with temperatures and pressure? Explain the variation of thermal conductivity of metals and non-metals with temperatures?
A furnace wall is to consist in series of 7 in of kaolin firebrick, 6 in of kaolin insulating brick, and sufficientfireclay brick to reduce the heat loss to 100 Btu/ hr ft2 when the face temperatures are 1500 and 100°F,respectively.a) Show the figure of the systemb) What thickness of fireclay brick should be used?c) If an effective air gap of 1/8 in can be incorporated between the fireclay and insulating brick whenerecting the wall without impairing its structural support, what thickness of insulating brick will berequired?
Steam at a temperature of 723 K is flowing through a pipe with an outer diameter of 100 mm. The pipe is insulated with 30-mm thick mineral wool, the average thermal conductivity of which is 0.065 W/m.K. Determine the outside surface temperature of mineral wool if the ambient air temperature is 300 Assume the hot-surface temperature of the mineral wool is the same as that of the flowing steam and the value of the surface coefficient of the insulating material is 33 W/m2.K.
How does a fin enhance heat transfer at a surface?
If a 20 cm long and 0.4 mm diameter platinum wire is placed horizontally in a water container with a temperature of 35°C and the surface temperature is 90°C, calculate the heat lost by the wire.