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1425 pts.) A cubic block (k-2.5 W/mK , α-1.15x106 m2/s) of size 5cmx5cmx5cm with initial temperature...
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is...
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is generating heat at a constant rate in W/m] inside another sphere of radius ry. The radius of the internal sphere is a 10 cm and the radius of the outer sphere is 40 cm. The outer surface is exposed to ambient air at 27°C and a convection coethicient -30 W/m-K. The thermal conductivity of the external sphere is 6.0 W/m-K. If the temperature at...
Example 5 • A cube (k=204W/mK, đ=8.4x10-5m-/s) of 11 cm on each side is initially at...
Example 5 • A cube (k=204W/mK, đ=8.4x10-5m-/s) of 11 cm on each side is initially at a temperature of 400° C. It is suddenly immersed in a tank of oil maintained at 85°C. The convection coefficient is 1100 W/m2 K. Determine the temperature at the center of one face after a time of 1 min by Heisler chart.
The upper surface of a 60-cm-thick solid plate (k = 237 W/m.K) is being cooled by...
The upper surface of a 60-cm-thick solid plate (k = 237 W/m.K) is being cooled by water with temperature of 20°C. The upper and lower surfaces of the solid plate maintained at constant temperatures of 60°C and 120°C, respectively. Given: The thermal conductivity of the solid plate is given as k = 237 W/ mK. (T..+) The thermal conductivity of water at the film temperature of T, = =(60°C + 20°C)/2 = 40°C is kfluid = 0.631 W/mK. 1. value...
interest. This alloy steel bracket (K-47 W/mK) is mounted securely to a worktable by its feet,...
interest. This alloy steel bracket (K-47 W/mK) is mounted securely to a worktable by its feet, while a hot cylindrical rod is placed within the bracket's cylindrical opening at the other end for processing work. It is known that when the rod is in contact with the bracket, it transfers a heat flux to the bracket of 1.2 W/cm2. Meanwhile, the large table upon which the bracket is mounted keeps its bottom surfaces at a constant 27 °C as shown...
An ordinary potato (k = 0.6 W/m.K and α = 0.13 × 10 -6 m2 /s)...
An ordinary potato (k = 0.6 W/m.K and α = 0.13 × 10 -6 m2 /s) can be approximated as a 6-cm diameter sphere. The potato is initially at a uniform temperature of 200 C and is to be baked in an oven with air temperature of 1800 C. The average convection coefficient between the potato and the air is experimentally determined to be 15 W/m2 .K. Determine how long it will take for the surface temperature of the potato...
During a fire, the trunks of some dry southern yellow pine trees (k = 0.94 W/m·K...
During a fire, the trunks of some dry southern yellow pine trees (k = 0.94 W/m·K and ? = 1.38 × 10?7 m2/s) that are initially at a uniform temperature of 30°C are exposed to hot gases at 600°C for a period of 3 hours, with a heat transfer coefficient of 65 W/m2·K on the surface. The ignition temperature of the trees is 400°C. Treating the trunks of the trees as long cylindrical rods of diameter 20 cm, determine the...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
Problem 2. A long 6.5 cm diameter solid cylinder steel (K 16.3 W/m. K,p 7817 kg/m3,...
Problem 2. A long 6.5 cm diameter solid cylinder steel (K 16.3 W/m. K,p 7817 kg/m3, Cp 460 J/kg.k). It's initially at a uniform temperature of T 150°C. It is suddenly exposed to a convection environment with h-285 W/m2 K and Too 50°C. Calculate the temperature at 1.) the axis of the cylinder, and 2.) a 2.5 cm radial distance after 5 min of exposure to the cooling flow. (20%)
please help me as soon as possible [20] SECTION B (Attempt any one Question) a) A...
please help me as soon as possible
[20] SECTION B (Attempt any one Question) a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 W/mK). The temperature at the root is 500 °C. The blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade surface and gas is 442 W/mK. Determine the temperature distribution and rate of heat...
Please help with the following problem and show work thank you 1. (40 pts) A spherical...
Please help with the following problem and show work thank
you
1. (40 pts) A spherical thermocouple (TC) is inserted into a duct to measure temperature of flowing air. The duct and TC were initially cold (27°C) and are exposed to sudden flow of hot air (77°C) at 3 m/s. a) (15 pts) What is the convective heat transfer coefficient on the TC surface? b) (15 pts) How long does it take for the TC to read the gas temperature...
P2) (50 pts.) A sphere of radius , and thermal conductivity of k=0.1 W/ mK is generating heat at a constant rate in W/m] inside another sphere of radius ry. The radius of the internal sphere is a 10 cm and the radius of the outer sphere is 40 cm. The outer surface is exposed to ambient air at 27°C and a convection coethicient -30 W/m-K. The thermal conductivity of the external sphere is 6.0 W/m-K. If the temperature at...
Example 5 • A cube (k=204W/mK, đ=8.4x10-5m-/s) of 11 cm on each side is initially at a temperature of 400° C. It is suddenly immersed in a tank of oil maintained at 85°C. The convection coefficient is 1100 W/m2 K. Determine the temperature at the center of one face after a time of 1 min by Heisler chart.
The upper surface of a 60-cm-thick solid plate (k = 237 W/m.K) is being cooled by water with temperature of 20°C. The upper and lower surfaces of the solid plate maintained at constant temperatures of 60°C and 120°C, respectively. Given: The thermal conductivity of the solid plate is given as k = 237 W/ mK. (T..+) The thermal conductivity of water at the film temperature of T, = =(60°C + 20°C)/2 = 40°C is kfluid = 0.631 W/mK. 1. value...
interest. This alloy steel bracket (K-47 W/mK) is mounted securely to a worktable by its feet, while a hot cylindrical rod is placed within the bracket's cylindrical opening at the other end for processing work. It is known that when the rod is in contact with the bracket, it transfers a heat flux to the bracket of 1.2 W/cm2. Meanwhile, the large table upon which the bracket is mounted keeps its bottom surfaces at a constant 27 °C as shown...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
Problem 2. A long 6.5 cm diameter solid cylinder steel (K 16.3 W/m. K,p 7817 kg/m3, Cp 460 J/kg.k). It's initially at a uniform temperature of T 150°C. It is suddenly exposed to a convection environment with h-285 W/m2 K and Too 50°C. Calculate the temperature at 1.) the axis of the cylinder, and 2.) a 2.5 cm radial distance after 5 min of exposure to the cooling flow. (20%)
please help me as soon as possible
[20] SECTION B (Attempt any one Question) a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 W/mK). The temperature at the root is 500 °C. The blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade surface and gas is 442 W/mK. Determine the temperature distribution and rate of heat...
Please help with the following problem and show work thank
you
1. (40 pts) A spherical thermocouple (TC) is inserted into a duct to measure temperature of flowing air. The duct and TC were initially cold (27°C) and are exposed to sudden flow of hot air (77°C) at 3 m/s. a) (15 pts) What is the convective heat transfer coefficient on the TC surface? b) (15 pts) How long does it take for the TC to read the gas temperature...
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