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Thermodynamics Forum
Radiation Heat Transfer Network - GATE ME '03
A plate having a 10 cm^2 area on each side is hanging in the middle of a room of a 100 m^2 total surface area. The plate temperature and emissivity are respectively 800 K and 0.6. The temperature and emissivity values for the surfaces of the room are 300 K and 0.3 respectively. Boltzmann constant σ
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Thermodynamics Forum
Radiation View Factors - GATE ME '08
A hollow enclosure is formed between two infinitely concentric cylinders of radii 1 m and 2 m respectively. Radiative heat exchange takes place between the inner surface of the larger cylinder (surface −2) and the outer surface of the smaller cylinder (surface−1) the radiating surfaces are diffuse a
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Thermodynamics Forum
Radiation View Factor - GATE ME '12
Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If D1 and D2 are the diameters of the inner and outer tubes respectively, then the view factor F22 is given by A. (D2/D1)−1 B. Zero C. (D1/D2) D. 1−(D1/D2)
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Sep 21
Thermodynamics Forum
What is the value of Stefan-Boltzman's constant?
What are the different units of Stefan-Boltzman's constant? What is the dimensional formula for Stefan-Boltzman's constant?
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Jun 21
Thermodynamics Forum
Total Emissive Power - GATE ME '15 S1
The total emissive power of a surface is 500 W/m2 at a temperature T1 and 1200 W/m2 at a temperature T2, where the temperatures are in Kelvin. Assuming the emissivity of the surface to be constant, the ratio of the temperatures T1/T2 is ________
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Thermodynamics Forum
Radiation Heat Transfer - GATE ME '09
Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and is the warmer one being maintained at 727 C, the lower plate (plate 2) is a diffuse and gray surface with an emissiv
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Thermodynamics Forum
View Factor in Sphere - GATE ME '14
A solid sphere of radius r1 = 20 mm is placed concentrically inside a hollow sphere of radius r2 = 30 mm. The view factor F21 for radiation heat transfer is A. 2/3 B. 4/9 C. 8/27 D. 9/4
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Sep 21
Thermodynamics Forum
Why radiation does not require a material medium?
How radiation heat transfer can occur in space?
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Jun 21
Thermodynamics Forum
Radiation Shield - GATE ME '14 S4
Two infinite parallel plates are placed at a certain distance apart. An infinite radiation shield is inserted between the plates without touching any of them to reduce heat exchange between the plates. Assume that the emissivities of plates and radiation shield are equal. The ratio of the net heat e
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Thermodynamics Forum
Radiation configuration factor - GATE ME '05
A solid cylinder (surface 2) is located at the center of a hollow sphere (surface 1). The diameter of the sphere is 1 m, while the cylinder has a diameter and length of 0.5 m each. The radiation configuration factor F11 is ______ A. 0.375 B. 0.625 C. 0.75 D. 1
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Sep 21
Thermodynamics Forum
What is the heat rate equation for radiation heat transfer?
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Jun 22