A truncated cone 30 cm high is constructed of aluminum [k = 204 W/m 0C]. The...
A truncated cone 30 cm high is constructed of aluminum [k = 204 W/m 0C]. The diameter at the top is 7.5 cm, and the diameter at the bottom is 12.5 cm. The lower surface is maintained at 93 °C; the upper surface, at 540 °C. The other surface is insulated. Assuming one dimensional heat flow, what is the rate of heat transfer in watts?
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A truncated cone 30 cm high is constructed of aluminum [k = 204
W/m 0C]. The...
A truncated solid cone is of circular cross section, and its diameter is related to the...
A truncated solid cone is of circular cross section, and its
diameter is related to the axial coordinate by an expression of the
formD=ax3/2, wherea=1.0 m-1/2.
The sides are well insulated, while the top surface of the cone
atx1is maintained atT1and the bottom surface atx2is maintained
atT2.
What is the rate of heat transfer across the cone if it is
constructed of pure aluminum withx1=0.075 m,T1=240°C,x2=0.225 m,
andT2=20°C? Evaluate the properties of aluminum atT¯=333 K.
3. The left end of the truncated aluminum cone shown is maintained at T1 30 C,...
3. The left end of the truncated aluminum cone shown is maintained at T1 30 C, and the right end is at T280 C. The sides are insulated. What is T(x)? [T = Cix + C2, C2 = T1-(T1-T2)/(1-X1/X2)] What is q through the cone? [372 W The right end is exposed to fluid at 80 C with h = 100 W/m2-K, while the other is exposed to fluid at 30 C with h = 200 W/m2-K. What is the...
A cylinder, 12 cm high and 8 cm in diameter, k = 12.5 W/mK, maintained at...
A cylinder, 12 cm high and 8 cm in diameter, k = 12.5 W/mK,
maintained at 36 ºC, is to be placed horizontally inside an
environment filled with air at 1 atm and 4 ºC. What is the
convection heat transfer rate between the cylinder and the air?
(Note: assume the cylinder is surrounded by air at 4 ºC, and
neglect heat transfer through the left and right end surfaces.)
A cylinder, 12 cm high and 8 cm in diameter,...
Problem 2 A 4 mm diameter and 20 cm long aluminum fin (k 240 W/m-K) is...
Problem 2 A 4 mm diameter and 20 cm long aluminum fin (k 240 W/m-K) is attached to a surface. If the heat transfer coefficient is 12 W/m2 K, determine the percent error in the rate of heat transfer from the fin when the infiniely long fin assumption is used nstead of the adiabatic fin tip assumption. D-4 mm L- 10 cm Fig. 2 fin
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/m.K. (T1+T) The thermal conductivity of water at the film temperature of Tf =(60°C + 20°C)/2 = 40°C is kfluid = 0.631 W/m.K. = 2 1. value: 3.00...
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...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
LT An aluminum rod of diameter D 2.5 cm and of length from a wall maintained at T, 300"C. The.coovective heat coefficient h 17 W/m2-K with an ambie.t air temperature T Thermal conductivity k =...
LT An aluminum rod of diameter D 2.5 cm and of length from a wall maintained at T, 300"C. The.coovective heat coefficient h 17 W/m2-K with an ambie.t air temperature T Thermal conductivity k = 204 WmK. Assume there is e luid by convection from the end of the rod, which is at temperature Ta. Using 2. -38c. nergy transfer to the a finite difference method, with Ax = 5 cm, the fo be derived for the solution of the...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
A truncated solid cone is of circular cross section, and its
diameter is related to the axial coordinate by an expression of the
formD=ax3/2, wherea=1.0 m-1/2.
The sides are well insulated, while the top surface of the cone
atx1is maintained atT1and the bottom surface atx2is maintained
atT2.
What is the rate of heat transfer across the cone if it is
constructed of pure aluminum withx1=0.075 m,T1=240°C,x2=0.225 m,
andT2=20°C? Evaluate the properties of aluminum atT¯=333 K.
3. The left end of the truncated aluminum cone shown is maintained at T1 30 C, and the right end is at T280 C. The sides are insulated. What is T(x)? [T = Cix + C2, C2 = T1-(T1-T2)/(1-X1/X2)] What is q through the cone? [372 W The right end is exposed to fluid at 80 C with h = 100 W/m2-K, while the other is exposed to fluid at 30 C with h = 200 W/m2-K. What is the...
A cylinder, 12 cm high and 8 cm in diameter, k = 12.5 W/mK,
maintained at 36 ºC, is to be placed horizontally inside an
environment filled with air at 1 atm and 4 ºC. What is the
convection heat transfer rate between the cylinder and the air?
(Note: assume the cylinder is surrounded by air at 4 ºC, and
neglect heat transfer through the left and right end surfaces.)
A cylinder, 12 cm high and 8 cm in diameter,...
Problem 2 A 4 mm diameter and 20 cm long aluminum fin (k 240 W/m-K) is attached to a surface. If the heat transfer coefficient is 12 W/m2 K, determine the percent error in the rate of heat transfer from the fin when the infiniely long fin assumption is used nstead of the adiabatic fin tip assumption. D-4 mm L- 10 cm Fig. 2 fin
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/m.K. (T1+T) The thermal conductivity of water at the film temperature of Tf =(60°C + 20°C)/2 = 40°C is kfluid = 0.631 W/m.K. = 2 1. value: 3.00...
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...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
LT An aluminum rod of diameter D 2.5 cm and of length from a wall maintained at T, 300"C. The.coovective heat coefficient h 17 W/m2-K with an ambie.t air temperature T Thermal conductivity k = 204 WmK. Assume there is e luid by convection from the end of the rod, which is at temperature Ta. Using 2. -38c. nergy transfer to the a finite difference method, with Ax = 5 cm, the fo be derived for the solution of the...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
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