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7. (20 pts) A sphere with 30 mm in diameter initially at 800 K is quenched...
5.61 Spheres A and B are initially at 800 K, and they are simultaneously quenched in...
5.61 Spheres A and B are initially at 800 K, and they are simultaneously quenched in large constant temperature baths, each having a temperature of 320 K. The follow- ing parameters are associated with each of the spheres and their cooling processes. Sphere A Sphere B Diameter (mm) Density (kg/m) Specific heat (kJ/kg .K) Thermal conductivity (W/ m K ) Convection coefficient (W/m²K) 300 1600 0.400 170 5 30 400 1.60 1.70 50 (a) Show in a qualitative manner. on...
Spheres A and B are initially at 800 K, and they are simultaneously quenched in large...
Spheres A and B are initially at 800 K, and they are simultaneously quenched in large constant temperature baths, each having a temperature of 320 K. The following parameters are associated with each of the spheres and their cooling processes Round numbers off to the nearest 100 to look up tables Fluid h&T 320K h&T=320K Sphere, A T-800 K Sphere, T =800 K Parameter Sphere B Sphere A 03 0.03 1600 400 Diameter, D [m] Density.p [kg/m] Mass, M [kg]...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K,...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K, is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are -1.7 W/m-K, 1600 J/kg-K, and 400 kg/m2, while the convection coefficient is 53 W/m2-K. Step 1 When deciding if the lumped capacitance method can be used, what is the value of the Biot number? the tolerance is +/-296 By accessing this Question Assistance, you will learn whille you...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is i...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is inserted into water stream having a temperature of 25°C. A thermocouple on the outer surface of the sphere indicates 55°C, 100 sec after the sphere is inserted into the water. Assume the sphere behaves as an isothermal object. (Pure gold: k = 400 W/m K, ρ = 9000 kg/m3,G-400 J/kg K, Volume of sphere (V)--, Lc = (3) Determine total...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
2 Two spheres, A and B, both initially at 700K, are quenched in liquid baths at...
2 Two spheres, A and B, both initially at 700K, are quenched in liquid baths at 300K. They have diameters 300 and 30 mm, density 1600 and 400 kg/m3, specific heat 0.4 and 1.6 kJ kg1 K1, thermal conductivities 170 and 3.4 Wm-1.K, and convection coefficients 5 and 50 Wm- 2K-1, respectively. Sketch the temperature histories of each sphere on T-t axes, calculate the time taken for the surface of each sphere to reach 400 K, and calculate the energy...
Supplemental Problem 2.003 A large plate of thickness 2L is at a uniform temperature of Tỉ-190°C,...
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?...
5. A flaked cereal is of thickness 2L=1.2 mm (or the characteristic length Lc = V/A=...
5. A flaked cereal is of thickness 2L=1.2 mm (or the characteristic length Lc = V/A= 0.6 mm). The density, specific heat, and thermal conductivity of the flake are p 700 kg/m3,cp = 2400J/kg K, and k = 0.34 W/m K, respectively. The product is to be baked by increasing its temperature from Ti = 20 °C to Tr = 220 °C in a convection oven, through which the product is carried on a conveyor. If the oven is Lo...
Solve quickly and carry units please rroblem I) A perfect sphere (Diameter-1 cm) of a gold...
Solve quickly and carry units please
rroblem I) A perfect sphere (Diameter-1 cm) of a gold alloy is placed in a special type o microwave oven. The sphere has a uniform initial temperature of 300 K. The microwave then turned on, which pr oduces u niform generation u-3,000,000 W/m2 within the sphere, and a fan produces convection heat transfer evenly over the surface of the sphere with convection coefficient h-6 W/m2 K and with air temperature Too- 300 K. Radiation...
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...
5.61 Spheres A and B are initially at 800 K, and they are simultaneously quenched in large constant temperature baths, each having a temperature of 320 K. The follow- ing parameters are associated with each of the spheres and their cooling processes. Sphere A Sphere B Diameter (mm) Density (kg/m) Specific heat (kJ/kg .K) Thermal conductivity (W/ m K ) Convection coefficient (W/m²K) 300 1600 0.400 170 5 30 400 1.60 1.70 50 (a) Show in a qualitative manner. on...
Spheres A and B are initially at 800 K, and they are simultaneously quenched in large constant temperature baths, each having a temperature of 320 K. The following parameters are associated with each of the spheres and their cooling processes Round numbers off to the nearest 100 to look up tables Fluid h&T 320K h&T=320K Sphere, A T-800 K Sphere, T =800 K Parameter Sphere B Sphere A 03 0.03 1600 400 Diameter, D [m] Density.p [kg/m] Mass, M [kg]...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K, is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are -1.7 W/m-K, 1600 J/kg-K, and 400 kg/m2, while the convection coefficient is 53 W/m2-K. Step 1 When deciding if the lumped capacitance method can be used, what is the value of the Biot number? the tolerance is +/-296 By accessing this Question Assistance, you will learn whille you...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is inserted into water stream having a temperature of 25°C. A thermocouple on the outer surface of the sphere indicates 55°C, 100 sec after the sphere is inserted into the water. Assume the sphere behaves as an isothermal object. (Pure gold: k = 400 W/m K, ρ = 9000 kg/m3,G-400 J/kg K, Volume of sphere (V)--, Lc = (3) Determine total...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
2 Two spheres, A and B, both initially at 700K, are quenched in liquid baths at 300K. They have diameters 300 and 30 mm, density 1600 and 400 kg/m3, specific heat 0.4 and 1.6 kJ kg1 K1, thermal conductivities 170 and 3.4 Wm-1.K, and convection coefficients 5 and 50 Wm- 2K-1, respectively. Sketch the temperature histories of each sphere on T-t axes, calculate the time taken for the surface of each sphere to reach 400 K, and calculate the energy...
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?...
5. A flaked cereal is of thickness 2L=1.2 mm (or the characteristic length Lc = V/A= 0.6 mm). The density, specific heat, and thermal conductivity of the flake are p 700 kg/m3,cp = 2400J/kg K, and k = 0.34 W/m K, respectively. The product is to be baked by increasing its temperature from Ti = 20 °C to Tr = 220 °C in a convection oven, through which the product is carried on a conveyor. If the oven is Lo...
Solve quickly and carry units please
rroblem I) A perfect sphere (Diameter-1 cm) of a gold alloy is placed in a special type o microwave oven. The sphere has a uniform initial temperature of 300 K. The microwave then turned on, which pr oduces u niform generation u-3,000,000 W/m2 within the sphere, and a fan produces convection heat transfer evenly over the surface of the sphere with convection coefficient h-6 W/m2 K and with air temperature Too- 300 K. Radiation...
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...
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