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Two concentric sphere with radius R1 and R2.
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T, = 700K E 0.8 RI T, =900K 2 R2 E20.5 3. Two gray-diffuse spheres have...
3. Two gray-diffuse spheres have properties and temperatures shown below. R and R2 are 0.1 m and 0.3 m respectively. (i...
3. Two gray-diffuse spheres have properties and temperatures shown below. R and R2 are 0.1 m and 0.3 m respectively. (i) Compute heat transfer rate of sphere 1, q W]. Also, to minimize the heat loss, you decide to put a radiation shield in between the two spheres. (ii) Where do you prefer to place the radiation shield, i.e., close to sphere 1 or sphere 2 or right in the middle? (iii Somehow you place the radiation shield with R3...
4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of...
4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of 400 K and 300 K. IF the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 x 10-8 W/m3K4, the net radiation heat exchange rate in kW/m2 between the two plates is (a) 0.66 (c) 0.99 (b) 0.79 (d) 3.96
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)...
it’s heat transfer class.. quick answer and clear steps please 3. For a four-surface system, all surfaces are diffuse and gray. All surfaces have the same size of square 2 m2 and the emissivities...
it’s heat transfer class.. quick answer and clear steps
please
3. For a four-surface system, all surfaces are diffuse and gray. All surfaces have the same size of square 2 m2 and the emissivities are 0.7,0.5, 0.7 and 0.8 for surface 1-4, respectively. The temperature of these surfaces are 500K, 400K, 500K and 700K for surface 1-4 respectively. (30+10 PTS) (a) Build the entire resistance system. (b) What are the view factors between surface 1 to 2 and 2 to...
The heat question and would like to have work solution. The answers are (c) 136.6 (d)...
The heat question and would like to have work solution. The
answers are (c) 136.6 (d) < 2%. thank you.
An long cylindrical vaccuum chamber shown in Figure 1, is used to anneal single titanium rods by maintaining their temperature at 800 °C for an extended period of time. Heat is introduced into the rods internally by induction. The insulation surrounding the chamber has a thicknesss of 50 mm and thermal conductivity of 0.1 W/m.K. The convective heat transfer coefficient...
3. Two gray-diffuse spheres have properties and temperatures shown below. R and R2 are 0.1 m and 0.3 m respectively. (i) Compute heat transfer rate of sphere 1, q W]. Also, to minimize the heat loss, you decide to put a radiation shield in between the two spheres. (ii) Where do you prefer to place the radiation shield, i.e., close to sphere 1 or sphere 2 or right in the middle? (iii Somehow you place the radiation shield with R3...
4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of 400 K and 300 K. IF the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 x 10-8 W/m3K4, the net radiation heat exchange rate in kW/m2 between the two plates is (a) 0.66 (c) 0.99 (b) 0.79 (d) 3.96
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)...
it’s heat transfer class.. quick answer and clear steps
please
3. For a four-surface system, all surfaces are diffuse and gray. All surfaces have the same size of square 2 m2 and the emissivities are 0.7,0.5, 0.7 and 0.8 for surface 1-4, respectively. The temperature of these surfaces are 500K, 400K, 500K and 700K for surface 1-4 respectively. (30+10 PTS) (a) Build the entire resistance system. (b) What are the view factors between surface 1 to 2 and 2 to...
The heat question and would like to have work solution. The
answers are (c) 136.6 (d) < 2%. thank you.
An long cylindrical vaccuum chamber shown in Figure 1, is used to anneal single titanium rods by maintaining their temperature at 800 °C for an extended period of time. Heat is introduced into the rods internally by induction. The insulation surrounding the chamber has a thicknesss of 50 mm and thermal conductivity of 0.1 W/m.K. The convective heat transfer coefficient...
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