A small body with surface area 0.1 m^2 and emissivity 0.8 is placed inside a large cavity. What is the radiation resistance between the small body and the large cavity?
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- 1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.Determine the total average hemispherical emissivity and the emissive power of a surface that has a spectral hemispherical emissivity of 0.8 at wavelengths less than 1.5m, 0.6 at wavelengths from 1.5to2.5m, and 0.4 at wavelengths longer than 2.5m. The surface temperature is 1111 K.
- Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.11.41 Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
- Two very large parallel plates are kept at uniform temperatures T1=800 K and T2=500 K, and have emissivities ε1=0.2 y ε2=0.7, respectively, as shown in the figure. Determine the net rate of radiation heat transfer between the two surfaces per unit surface area of the plates.Determine the fraction of the radiation leaving the base of the cylindrical enclosure that escapes through a coaxial ring opening at its top surface. The radius and the length of the enclosure are r1 5 10 cm and L = 10 cm, while the inner and outer radii of the ring are r2 = 5 cm and r3 = 8 cm, respectively.2. A thin aluminum sheet with an emissivity of 0.15 on both sides is placed between two very large parallel plates, which are maintained at uniform temperatures T1 = 900 K and T2 = 650 K and have emissivities ?1 = 0.5 and ?2 = 0.8, respectively. Determine the net rate of radiation heat transfer between two plates per unit surface area of the plates and compare the result with that without the shield
- Calculate the ratio of the radiant energy emitted from a surface at 37ºC and an adjacent surface of equal area and emissivity at 35ºC.Two large parallel plates are at temperatures T1 = 500 K, and T2 = 300 K. Their emissivities are ε1 = 0.85 and ε2 = 0.90. (a) What is the radiant flux between the plates? (b) If a polished aluminum sheet (ε = 0.10) is placed between the plates as a radiation shield, how much is the reduction in radiant heat transfer?What is the average or total emissivity of the given radiation shields? Note: the radiation shield are open-ended cylindrical shape