Pravinbhai Inconel® refers to a class of nickel-chromium-based superalloys that are used in high-temperature applications, such as gas turbineblades. For further improvement in the performance of gas turbine engines, the outer blade surface is coated with ceramic-basedthermal 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 μmon its surface. At the interface between the Inconel® and the TBC, the thermal contact conductance is 3500 W/m2K. The thermalconductivities 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 combustiongasses at 1500°C, and the convection heat transfer coefficient is 750 W/m2K. Determine the temperature at the mid-plane of theInconel plate if the outer surface temperature is 1175°C.The temperature is°C.

The objective of this question is to determine the temperature at the mid-plane of the Inconel…

Answered: Inconel® refers to a class of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Comparing the thermal barrier coatings (TBCs) with the superalloy components of high performance aerospace turbine blades, which of the following statements are true? Select one or more: a. The TBCs have the same thermal conductivity as the superalloys b. The ductility of the TBCs is lower than the superalloys □c. The ductility of the superalloys is lower than the TBCs d. The superalloys have higher thermal conductivity than the TBCs. The thermal expansion of the TBCs is lower than that of the superalloys e.
Two 0.5-cm-diameter rods of 1020 steel (σts = 395 MPa) are to be joined with a silver braze alloy 0.025 cm thick (σys = 145 MPa) to produce one long rod. The ultimate strength of this brazed structure is found to be approximately 345 MPa. If it is necessary to reduce the diameter of the rods to 0.25 cm with no change to the braze joint itself, will the strength (in MPa units) increase, decrease, or remain the same? If it changes, by how much?
PROBLEM: IIC - 12 BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD
Why should we avoid wet contact with electrical appliances? Provide a mathematical justification for your answer?
Presents the diagram of the problem, necessary formulas, clearance and numerical solution: How much heat must be applied to a 12-kg bar of silver to raise its temperature from 22°C to 90°C?
To ensure a tight fit, the aluminum rivet used in airplane construction are made slightly larger than the rivet holes and cooled by dry ice (solid CO2) before being driven. If the diameter of a hole is 0.500 cm, what should be the diameter of a rive at 20 degree Celsius if its diameter is equal that of a hole when the rivet is cooled to -78 degree Celsius, the temperature of dry ice? Assume the coefficient of expansion to remain constant. (Given and solutions)
Review Conceptual Example 5 before attempting this problem. To illustrate the effect of ice on the aluminum cooling plate, consider the drawing shown here and the data contained therein. Ignore any limitations due to significant figures. (a) Calculate the heat per second per square meter that is conducted through the ice-aluminum combination. (b) Calculate the heat per second per square meter that would be conducted through the aluminum if the ice were not present. Notice how much larger the answer is in (b) as compared to (a). (a) Number i (b) Number i -10.0°C Units Units Ice -0.0050 m Aluminum -25.0°C 0.0015 m
IDerive the value of thermal resistance in aCylindrical wall
The Diamond Ring Solution. The processing chip on the computer that controls the navigation equipment on your spacecraft is overheating. Unless you fix the problem, the chip will be damaged and the navigation system will shut down. You open the panel and find that the small copper disk that was supposed to bridge the gap between the smooth top of the chip and the cooling plate is missing, leaving a 2.0 mm gap between them. In this configuration, the heat cannot escape the chip at the required rate. You notice by the thin smudge of thermal grease (a highly thermally conductive material used to promote good thermal contact between surfaces) that the missing copper disk was 2.0 mm thick and had a diameter of 1.0 cm. You know that the chip is designed to run below 70 °C, and the copper cooling plate is held at a constant 5.0 °C. (a) What was the rate of heat flow from the chip to the copper plate when the original copper disk was in place and the chip was at its maximum operating…
The Diamond Ring Solution. The processing chip on the computer that controls the navigation equipment on your spacecraft is overheating. Unless you fix the problem, the chip will be damaged and the navigation system will shut down. You open the panel and find that the small copper disk that was supposed to bridge the gap between the smooth top of the chip and the cooling plate is missing, leaving a 2.0 mm gap between them. In this configuration, the heat cannot escape the chip at the required rate. You notice by the thin smudge of thermal grease (a highly thermally conductive material used to promote good thermal contact between surfaces) that the missing copper disk was 2.0 mm thick and had a díameter of 1.2 cm. You know that the chip is designed to run below 65 °C, and the copper cooling plate is held at a constant 5.0 °C. (a) What was the rate of heat flow from the chip to the copper plate when the original copper disk was in place and the chip was at its maximum operating…
Consider two types of thermal barrier coatings made of Zirconia. The first A is pure Zirconia and the second B has a small % of yttrium added to it. Upon cooling a coating of either type from high temperature to room temperature, what of the following is the most likely outcome? Select one: a. A: stays stable; B: stays stable b. A: stays stable; B: experiences high stress, phase transformation and undergoes cracking; c. A: experiences high stress, phase transformation and undergoes cracking; B: stays stable d. A: experiences high stress, phase transformation and undergoes cracking; B: undergoes cracking and distortion
Bebang owns a 830-mm-thick concrete brick table top that has an area of 10,000,000 mm^2 and a 0.750-cm-thick glass plate that has an area of 20,000 cm^2. Assuming the same temperature difference across each, what is the ratio of the rate of heat conduction through the plate with respect to the rate of heat conduction through the table top? Use Table 10.1(given below) for the value of Thermal Conductivity k. Table 10.1 Thermat Conductivities of Common Substances Values are given for temperatures near o °C. Substance Thermal Conductivity k (W/m-O Diamond 2000 Silver 420 Copper 390 Gold 318 Aluminum 220 Steel iron Steel (stainless) 14 Ice 2.2 Glass (average) 0.84 Concrete brick O.84 water 0.6 Fatty tissue (without blood) 0.2 Asbestos 0.16 Plasterboard 0.16 wood 0.08-0.16 Snow (dry) 0.10 Cork 0.042 Glass wool 0.042 wool 0.04 Down feathers 0.025 Air 0.023 Polystyrene foam 0.010

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