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Problem 3 Consider a slab of thickness L as illustrated in the figure below. A fluid...
Problem 2: Consider a large plane slab of semi-thickness L = 0.3 m, thermal conductivity k...
Problem 2: Consider a large plane slab of semi-thickness L = 0.3 m, thermal conductivity k = 2.5 W/m K and surface area A = 20.0 m². Both sides of the slab is maintained at a constant wall temperature of 358°K while it is subjected to a uniform but constant heat flux of 950.0 W/m2 Evaluate the temperature distribution/profile within the wall. Calculate the heat flux and temperature at location x = 0.1m. Problem 3: Consider a 10.0 m long...
A concrete slab (k = 1.4 W/m·K) is subjected to a heat flux of 450 W/m2....
A concrete slab (k = 1.4 W/m·K) is subjected to a heat flux of 450 W/m2. The slab sits on the ground, which is at a temperature of -8°C, and it is desired to keep the temperature at the upper surface of the slab at 20°C. Determine the thickness of the slab. Ans: (a) L=
3. The wall shown in the figure below has thickness L 0.25 m and uniform thermal...
3. The wall shown in the figure below has thickness L 0.25 m and uniform thermal conductivity k-1 W/mK. It is exposed to circulating fluid on the surface at x = L, where the temperature ofthe fluid is T-= 30°C and the convection coefficient is h = 4 W/m2.K. The surface at x = 0 is maintained at constant temperature T-20 °C. Assume ID heat flux, and that the system is at steady state a) b) Determine the temperature distribution...
Supplemental Problem 2.003 A large plate of thickness 2L is at a uniform temperature of Tỉ-190°C,...
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Supplemental Problem 2.003 A large plate of thickness 2L is at a uniform temperature of Tỉ-190°C, when it is suddenly quenched by dipping it in a liquid bath of temperature To Heat transfer to the liquid is characterized by the convection coefficient h. Assume x = 0 corresponds to the midplane of the wall -20°C (a) If h = 100 w/m2, K, what is the heat flux atx = L and t = 0?...
Consider a cross-flow heat exchanger with a surface area of 10 m². The cold fluid has...
Consider a cross-flow heat exchanger with a surface area of 10 m². The cold fluid has a heat capacity rate of 2310 W/K and inlet and outlet temperatures of 25°C and 150°C respectively. The hot fluid has a heat capacity rate of 2000 W/K and an inlet temperature of 325°C. If the cold fluid can be considered mixed and the hot fluid unmixed, find the overall heat transfer coefficient, u, in W/m2.K, and the outlet temperature, in °C, of the...
The equation for the local heat transfer coefficient h, for a fluid flow of velocity Vin...
The equation for the local heat transfer coefficient h, for a fluid flow of velocity Vin the x direction over a specific constant temperature surface is Nuz = CRe: Prn where C and n are constants. Assume the fluid properties k, p, Pr, V, and Cp are constant and known. The heat transfer coefficient over the entire surface is governed by this equation. At a position x1 = 20 cm from the leading edge of the plate, the local heat...
The one-dimensional plane wall, shown in the figure below, is of thickness L =75 mm and...
The one-dimensional plane wall, shown in the figure below, is of thickness L =75 mm and thermal conductivity k = 15 W/ mK. The fluid temperatures are T, 200°C and T2 = 100°C, respectively. Using the minimum and maximum typical values of the convection heat! transfer coefficients listed in the table below, determine the minimum and maximum steady-state heat fluxes through the wall for free convection in gases and free convection in liquids. Typical values of the convection heat transfer...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water i...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
T. -20°C h 70 W/m2 °C Q5. A fluid at 20 °C flows over a hollow,...
T. -20°C h 70 W/m2 °C Q5. A fluid at 20 °C flows over a hollow, plain carbon-steel tube (3-mm LD., 6 mm OD., 100-mm long, k-60.5 W/m°C) connected to two walls, one of which is maintained at 100 C and the other at 50 °C. If the convective heat transfer coefficient is 70 W/m2°c, determine (a) The temperature of the tube midway between the plates. (b) The heat transfer rate from the plate at 100 °C. (c) The heat...
Consider a rectangular fin (k = 180 W/m-K) of length L =10 mm, thickness i =1...
Consider a rectangular fin (k = 180 W/m-K) of length L =10 mm, thickness i =1 mm, and width w» t. The base temperature of the finis Ty = 150°C, and the finis exposed to a fluid of temperature T, =25°C. Assuming a uniform convection coefficient of h = 110 W/m2.K over the entire fin surface, determine the fin heat transfer rate per unit width 4; efficiency ng: effectiveness es, thermal resistance per unit width and the tip temperature T...
Problem 2: Consider a large plane slab of semi-thickness L = 0.3 m, thermal conductivity k = 2.5 W/m K and surface area A = 20.0 m². Both sides of the slab is maintained at a constant wall temperature of 358°K while it is subjected to a uniform but constant heat flux of 950.0 W/m2 Evaluate the temperature distribution/profile within the wall. Calculate the heat flux and temperature at location x = 0.1m. Problem 3: Consider a 10.0 m long...
3. The wall shown in the figure below has thickness L 0.25 m and uniform thermal conductivity k-1 W/mK. It is exposed to circulating fluid on the surface at x = L, where the temperature ofthe fluid is T-= 30°C and the convection coefficient is h = 4 W/m2.K. The surface at x = 0 is maintained at constant temperature T-20 °C. Assume ID heat flux, and that the system is at steady state a) b) Determine the temperature distribution...
I will rate. Thanks so much
Supplemental Problem 2.003 A large plate of thickness 2L is at a uniform temperature of Tỉ-190°C, when it is suddenly quenched by dipping it in a liquid bath of temperature To Heat transfer to the liquid is characterized by the convection coefficient h. Assume x = 0 corresponds to the midplane of the wall -20°C (a) If h = 100 w/m2, K, what is the heat flux atx = L and t = 0?...
Consider a cross-flow heat exchanger with a surface area of 10 m². The cold fluid has a heat capacity rate of 2310 W/K and inlet and outlet temperatures of 25°C and 150°C respectively. The hot fluid has a heat capacity rate of 2000 W/K and an inlet temperature of 325°C. If the cold fluid can be considered mixed and the hot fluid unmixed, find the overall heat transfer coefficient, u, in W/m2.K, and the outlet temperature, in °C, of the...
The equation for the local heat transfer coefficient h, for a fluid flow of velocity Vin the x direction over a specific constant temperature surface is Nuz = CRe: Prn where C and n are constants. Assume the fluid properties k, p, Pr, V, and Cp are constant and known. The heat transfer coefficient over the entire surface is governed by this equation. At a position x1 = 20 cm from the leading edge of the plate, the local heat...
The one-dimensional plane wall, shown in the figure below, is of thickness L =75 mm and thermal conductivity k = 15 W/ mK. The fluid temperatures are T, 200°C and T2 = 100°C, respectively. Using the minimum and maximum typical values of the convection heat! transfer coefficients listed in the table below, determine the minimum and maximum steady-state heat fluxes through the wall for free convection in gases and free convection in liquids. Typical values of the convection heat transfer...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
T. -20°C h 70 W/m2 °C Q5. A fluid at 20 °C flows over a hollow, plain carbon-steel tube (3-mm LD., 6 mm OD., 100-mm long, k-60.5 W/m°C) connected to two walls, one of which is maintained at 100 C and the other at 50 °C. If the convective heat transfer coefficient is 70 W/m2°c, determine (a) The temperature of the tube midway between the plates. (b) The heat transfer rate from the plate at 100 °C. (c) The heat...
Consider a rectangular fin (k = 180 W/m-K) of length L =10 mm, thickness i =1 mm, and width w» t. The base temperature of the finis Ty = 150°C, and the finis exposed to a fluid of temperature T, =25°C. Assuming a uniform convection coefficient of h = 110 W/m2.K over the entire fin surface, determine the fin heat transfer rate per unit width 4; efficiency ng: effectiveness es, thermal resistance per unit width and the tip temperature T...
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