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Ronus Question ) A sod steel sphnie. 300 mm in diameter s coated with a delectric...
7. (20 pts) A sphere with 30 mm in diameter initially at 800 K is quenched...
7. (20 pts) A sphere with 30 mm in diameter initially at 800 K is quenched in a large bath having a constant temperature of 320 K with a convection heat transfer of 75 W/m2.K. The thermophysical properties of the sphere material are: p=400 kg/mº, c=1600 J/kg-K, and k=1.7 W/mK. (Use characteristic length Lc=VIA to determine applicability of lumped method; Use radius of the sphere for one term approximation) a) Calculate the time required for the surface of the sphere...
Please show Every Step and As Soon as Possible. Protective layer A 25-mm diameter, spherical fuel...
Please show Every Step and As Soon as Possible.
Protective layer A 25-mm diameter, spherical fuel element (27.6 W/m·K) with a volumetric rate of generation of 15 x 106 W/m² is coated with a 1-mm thick protective layer that has a thermal conductivity of 0.375 W/m·K. If the fuel element has a surface temperature of 314.15°C, determine the temperature of the outer surface of the protective layer. 25 mm 1 mm
[15] A 3 mm diameter wire of material A is coated with a 0.5 mm layer...
[15] A 3 mm diameter wire of material A is coated with a 0.5 mm layer of material B in order to improve the interface properties with the body. Use the following data to answer the questions below. Material Density (g/cm3) Young's Modulus (GPa) 225 170 Yield Strength (MPa) 480 250 6.9 Α B 4.2 a) What is the Young's modulus of the composite? b) How much load (in N) can the composite carry in tension before plastic deformation occurs?...
A stainless-steel-bottomed kettle, its bottom 28 cm in diameter and 1.6 mm thick, sits on a...
A stainless-steel-bottomed kettle, its bottom 28 cm in diameter and 1.6 mm thick, sits on a burner. The kettle holds boiling water, and energy flows into the water from the kettle bottom at 800 W . What is the temperature of the bottom surface of the kettle? Thermal conductivity of stainless steel is 14 W/(m⋅K). Express your answer in degrees Celsius to four significant figures.
5. A steel post (10 mm diameter, 0.5 m length) is placed vertically on top of a heated block of steel (steel thermal conductivity 50 Wm K1) with perfect contact. The core temperature of the block...
5. A steel post (10 mm diameter, 0.5 m length) is placed vertically on top of a heated block of steel (steel thermal conductivity 50 Wm K1) with perfect contact. The core temperature of the block is Th. However, placing the steel post on the block reduces the temperature at the interface between the post and the block to T 195 C, since the post acts as a fin (assume that it is infinitely long with respect to its diameter)...
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...
Gas at a temperature of 300°C with a convective coefficient h=75 W/m2 K flows through a...
Gas at a temperature of 300°C with a convective coefficient h=75 W/m2 K flows through a packed bed of aluminum (2024) spheres that is used as a thermal energy storage system. If the initial temperature of the spheres is 25°C and the diameter of each sphere is 75-mm, find the time, in seconds, required to for a sphere to reach 80% of the maximum possible thermal energy as well as the surface temperature and the centerline temperature at this time,...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
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)...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with a plastic insulation (thickness 2.0 mm; thermal conductivity: 0.4 W/m K) is exposed to air at 300 K. The heat loss per meter of wire generated is 200 W/m. Determine: ) Convective heat-transfer coefficient between the insulation and the surrounding air, h (25 pt) 2) Temperature of the insulation surface T2. (15 pt) HINT: T2 is a value between 320K and 400K To T2...
7. (20 pts) A sphere with 30 mm in diameter initially at 800 K is quenched in a large bath having a constant temperature of 320 K with a convection heat transfer of 75 W/m2.K. The thermophysical properties of the sphere material are: p=400 kg/mº, c=1600 J/kg-K, and k=1.7 W/mK. (Use characteristic length Lc=VIA to determine applicability of lumped method; Use radius of the sphere for one term approximation) a) Calculate the time required for the surface of the sphere...
Please show Every Step and As Soon as Possible.
Protective layer A 25-mm diameter, spherical fuel element (27.6 W/m·K) with a volumetric rate of generation of 15 x 106 W/m² is coated with a 1-mm thick protective layer that has a thermal conductivity of 0.375 W/m·K. If the fuel element has a surface temperature of 314.15°C, determine the temperature of the outer surface of the protective layer. 25 mm 1 mm
[15] A 3 mm diameter wire of material A is coated with a 0.5 mm layer of material B in order to improve the interface properties with the body. Use the following data to answer the questions below. Material Density (g/cm3) Young's Modulus (GPa) 225 170 Yield Strength (MPa) 480 250 6.9 Α B 4.2 a) What is the Young's modulus of the composite? b) How much load (in N) can the composite carry in tension before plastic deformation occurs?...
5. A steel post (10 mm diameter, 0.5 m length) is placed vertically on top of a heated block of steel (steel thermal conductivity 50 Wm K1) with perfect contact. The core temperature of the block is Th. However, placing the steel post on the block reduces the temperature at the interface between the post and the block to T 195 C, since the post acts as a fin (assume that it is infinitely long with respect to its diameter)...
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...
Gas at a temperature of 300°C with a convective coefficient h=75 W/m2 K flows through a packed bed of aluminum (2024) spheres that is used as a thermal energy storage system. If the initial temperature of the spheres is 25°C and the diameter of each sphere is 75-mm, find the time, in seconds, required to for a sphere to reach 80% of the maximum possible thermal energy as well as the surface temperature and the centerline temperature at this time,...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
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)...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with a plastic insulation (thickness 2.0 mm; thermal conductivity: 0.4 W/m K) is exposed to air at 300 K. The heat loss per meter of wire generated is 200 W/m. Determine: ) Convective heat-transfer coefficient between the insulation and the surrounding air, h (25 pt) 2) Temperature of the insulation surface T2. (15 pt) HINT: T2 is a value between 320K and 400K To T2...
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