1. Assume steady-state, one-dimensional heat conduction through the symmetric shape shown. qx Assuming that there is no internal heat generation, derive an expression for the thermal conductivity k(x) for these conditions: A(x) = (1 - x), T(x) = 300(1 - 2x - x³), and q = 6000 W, where A is in square meters, T in kelvins, and x in meters. Answer: k = 20 (1-x)(2+3x²) 2. At a given instant of time, the temperature distribution within an infinite homogeneous body is given by the function T(x, y, z) = x² - 2y² + z² − xy +2yz Assuming constant properties and no internal heat generation, determine the regions where the temperature changes with time. Answer: T at = 0 3. The temperature distribution across a wall 0.3m thick at a certain instant of time is T(x) = a + bx + cx², where T is in degrees Celsius and x is in meters, a = 200°C, b = -200°C/m, and c = 30°C/m². The wall has a thermal conductivity of 1W/m.K. (a) On a unit surface area basis, determine the rate of heat transfer into and out of the wall and the rate of change of energy stored by the wall. (b) If the cold surface is exposed to a fluid at 100°C, what is the convection coefficient? Answer: (a). 18W/m² (b). 4.3W/m²*K

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Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.13P
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1. Assume steady-state, one-dimensional heat conduction through the symmetric shape shown.
qx
Assuming that there is no internal heat generation, derive an expression for the thermal
conductivity k(x) for these conditions: A(x) = (1 - x), T(x) = 300(1 - 2x - x³), and q = 6000 W,
where A is in square meters, T in kelvins, and x in meters.
Answer: k =
20
(1-x)(2+3x²)
2. At a given instant of time, the temperature distribution within an infinite homogeneous body is
given by the function
T(x, y, z) = x² - 2y² + z² − xy +2yz
Assuming constant properties and no internal heat generation, determine the regions where the
temperature changes with time.
Answer: T
at
= 0
3. The temperature distribution across a wall 0.3m thick at a certain instant of time is
T(x) = a + bx + cx², where T is in degrees Celsius and x is in meters, a = 200°C, b = -200°C/m,
and c = 30°C/m². The wall has a thermal conductivity of 1W/m.K.
(a) On a unit surface area basis, determine the rate of heat transfer into and out of the wall and the
rate of change of energy stored by the wall.
(b) If the cold surface is exposed to a fluid at 100°C, what is the convection coefficient?
Answer: (a). 18W/m² (b). 4.3W/m²*K
Transcribed Image Text:1. Assume steady-state, one-dimensional heat conduction through the symmetric shape shown. qx Assuming that there is no internal heat generation, derive an expression for the thermal conductivity k(x) for these conditions: A(x) = (1 - x), T(x) = 300(1 - 2x - x³), and q = 6000 W, where A is in square meters, T in kelvins, and x in meters. Answer: k = 20 (1-x)(2+3x²) 2. At a given instant of time, the temperature distribution within an infinite homogeneous body is given by the function T(x, y, z) = x² - 2y² + z² − xy +2yz Assuming constant properties and no internal heat generation, determine the regions where the temperature changes with time. Answer: T at = 0 3. The temperature distribution across a wall 0.3m thick at a certain instant of time is T(x) = a + bx + cx², where T is in degrees Celsius and x is in meters, a = 200°C, b = -200°C/m, and c = 30°C/m². The wall has a thermal conductivity of 1W/m.K. (a) On a unit surface area basis, determine the rate of heat transfer into and out of the wall and the rate of change of energy stored by the wall. (b) If the cold surface is exposed to a fluid at 100°C, what is the convection coefficient? Answer: (a). 18W/m² (b). 4.3W/m²*K
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