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Problem 2: A 25 mm thick glass sheet needs to be rapidly quenched by air jets...
finite element method 2. Aluminum fins with rectangular profiles (5 mm wide and 1 mm thick) are used to remove heat...
finite element method
2. Aluminum fins with rectangular profiles (5 mm wide and 1 mm thick) are used to remove heat from a surface whose temperature is 150°C. The temperature of ambient air is 20°C. The thermal conductivity of aluminium is 168 W/m.K. The natural convective coefficient associated with the surrounding air is 35 W/m2.K. The fins are 150 mm long and the heat loss from the tip of the fin may be neglected. (a) Determine the temperature distribution along...
Problem 5.09 A sheet of steel 3.6 mm thick has nitrogen atmospheres on both sides at...
Problem 5.09 A sheet of steel 3.6 mm thick has nitrogen atmospheres on both sides at 1200°C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6.9 x 10-11 m2/s, and the diffusion flux is found to be 3.9 x 10 kg/m2-s Also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4.7 kg/m3. How far into the sheet from this high...
5.09 Problem 5.09 A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides...
5.09
Problem 5.09 A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 12 OC and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 5.5 × 10-11 m2/s and the diffusion flux s found to be 4.)× 10 7 kg/m2-s Also, t is known that the concentration of nit ogen in the steel at the high pressure surface s 60 kg m3 Ho far into...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k =...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Problem 5.10 A sheet of BCC iron 4.9-mm thick was exposed to a carburizing atmosphere on...
Problem 5.10
A sheet of BCC iron 4.9-mm thick was exposed to a carburizing
atmosphere on one side and a decarburizing atmosphere on the other
side at 725°C. After having reached steady state, the iron was
quickly cooled to room temperature. The carbon concentrations at
the two surfaces were determined to be 0.011 and 0.0074 wt%.
Calculate the diffusion coefficient if the diffusion flux is 2.6 ×
10-8 kg/m2-s, given that the densities of
carbon and iron are 2.25 and...
Problem 5.056 A soda lim e glass sphere of diameter Di = 25 mm is encased...
Problem 5.056 A soda lim e glass sphere of diameter Di = 25 mm is encased in a bakelite spherical shell of thickness = 10 mm. The composite sphere is initially at a uniform temperature T, = 36" and is exposed to a fluid at T. 10°C with h 30 W/m2. K. Determine the center temperature of the glass at 110 sec. Neglect the thermal contact resistance at the interface between the two materials. The center temperature is eC.
A 70-mm diameter hot solid rod is suspended in a room in which the air and walls are at 25°C
A 70-mm diameter hot solid rod is suspended in a room in which the air and walls are at 25°C., The surface temperature of the rod and its emissivity are 200°C and 0.8, respectively. The associated coefficient of convective heat transfer from the rod surface to the air is 15 W/m2.K. If the total heat loss from the surface area of the rod is estimated to be 947 W, what is the length of the rod? Area of both sides of the...
Problem 1 Consider a 15-mm by 15-mm chip that is cooled on its top surface by a 6 m/s flow of 25 ...
Problem 1 Consider a 15-mm by 15-mm chip that is cooled on its top surface by a 6 m/s flow of 25 °C air. Any heat transfer from its bottom surface to the circuit board is ignored. Because of the chip construction, the electrical power dissipated in the chip results in a uniform heat flux over the surface of the chip. If the maximum temperature that any part of the chip can experience is 80 "C, determine the maximum allowable...
A 50 mm thick steel plate (AISI347) has a uniform heat flux applied to its bottom...
A 50 mm thick steel plate (AISI347) has a uniform heat flux
applied to its bottom surface by a heater. The heater is in contact
with the steel plate, and the interface between the heater and
steel has a contact resistance of 2.0 x 10-4
m2*K/W. The top surface of the plate is exposed to
surrounding air (T = 20oC, h = 10 W/m2*K) and
exchanges radiation with surroundings at Tsur =
10oC. The emissivity of the plate is 0.85....
1. Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm a W/m C) separated...
1. Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm a W/m C) separated by a 12-mm-wide stagnant air space thick layers of glass ( 0.78 (0.026 W/m C). Determine the steady rate of heat transfer through this double- pane window and the temperature of its inner surface for a day during which the room is maintained at 24 C while the temperature of the outdoors is 5 C. Take the convection heat transfer coefficients on the inner...
finite element method
2. Aluminum fins with rectangular profiles (5 mm wide and 1 mm thick) are used to remove heat from a surface whose temperature is 150°C. The temperature of ambient air is 20°C. The thermal conductivity of aluminium is 168 W/m.K. The natural convective coefficient associated with the surrounding air is 35 W/m2.K. The fins are 150 mm long and the heat loss from the tip of the fin may be neglected. (a) Determine the temperature distribution along...
Problem 5.09 A sheet of steel 3.6 mm thick has nitrogen atmospheres on both sides at 1200°C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6.9 x 10-11 m2/s, and the diffusion flux is found to be 3.9 x 10 kg/m2-s Also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4.7 kg/m3. How far into the sheet from this high...
5.09
Problem 5.09 A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 12 OC and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 5.5 × 10-11 m2/s and the diffusion flux s found to be 4.)× 10 7 kg/m2-s Also, t is known that the concentration of nit ogen in the steel at the high pressure surface s 60 kg m3 Ho far into...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Problem 5.10
A sheet of BCC iron 4.9-mm thick was exposed to a carburizing
atmosphere on one side and a decarburizing atmosphere on the other
side at 725°C. After having reached steady state, the iron was
quickly cooled to room temperature. The carbon concentrations at
the two surfaces were determined to be 0.011 and 0.0074 wt%.
Calculate the diffusion coefficient if the diffusion flux is 2.6 ×
10-8 kg/m2-s, given that the densities of
carbon and iron are 2.25 and...
Problem 5.056 A soda lim e glass sphere of diameter Di = 25 mm is encased in a bakelite spherical shell of thickness = 10 mm. The composite sphere is initially at a uniform temperature T, = 36" and is exposed to a fluid at T. 10°C with h 30 W/m2. K. Determine the center temperature of the glass at 110 sec. Neglect the thermal contact resistance at the interface between the two materials. The center temperature is eC.
Problem 1 Consider a 15-mm by 15-mm chip that is cooled on its top surface by a 6 m/s flow of 25 °C air. Any heat transfer from its bottom surface to the circuit board is ignored. Because of the chip construction, the electrical power dissipated in the chip results in a uniform heat flux over the surface of the chip. If the maximum temperature that any part of the chip can experience is 80 "C, determine the maximum allowable...
A 50 mm thick steel plate (AISI347) has a uniform heat flux
applied to its bottom surface by a heater. The heater is in contact
with the steel plate, and the interface between the heater and
steel has a contact resistance of 2.0 x 10-4
m2*K/W. The top surface of the plate is exposed to
surrounding air (T = 20oC, h = 10 W/m2*K) and
exchanges radiation with surroundings at Tsur =
10oC. The emissivity of the plate is 0.85....
1. Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm a W/m C) separated by a 12-mm-wide stagnant air space thick layers of glass ( 0.78 (0.026 W/m C). Determine the steady rate of heat transfer through this double- pane window and the temperature of its inner surface for a day during which the room is maintained at 24 C while the temperature of the outdoors is 5 C. Take the convection heat transfer coefficients on the inner...
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