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3 Consider a circular grill whose diameter is 0.3 m. pottom of the grill is covered with hot coal bricks at <, while the wire mesh on top of the grill is covered steaks initially at 5°C. The distance between the coal s and the steaks is 0.20 m. Treating both the steaks and pal bricks as blackbodies, determine the initial rate of ion heat transfer from the coal bricks to the steaks. determine the initial rate of radiation heat transfer esteaks if the side opening of the grill is covered by

3 Consider a circular grill whose diameter is 0.3 m. pottom of the grill is covered with hot coal bricks at <, while the wire mesh on top of the grill is covered steaks initially at 5°C. The distance between the coal s and the steaks is 0.20 m. Treating both the steaks and pal bricks as blackbodies, determine the initial rate of ion heat transfer from the coal bricks to the steaks. determine the initial rate of radiation heat transfer esteaks if the side opening of the grill is covered by

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question 21-113

D2 = 0.4 m are maintained at uniform temperatures T, = 700 K and T, = 500 K and have emissivities & = 0.5 and ɛ, = 0.7, respectively. Determine the net rate of radiation heat transfer between the two spheres. Also, determine the convection heat transfer coefficient at the outer surface if both the surrounding medium and the surrounding surfaces are at 30°C. Assume the emissivity of the outer surface is 0.35. 21–113 Consider a circular grill whose diameter is 0.3 m. The bottom of the grill is covered with hot coal bricks at 950 K, while the wire mesh on top of the grill is covered with steaks initially at 5°C. The distance between the coal bricks and the steaks is 0.20 m. Treating both the steaks and the coal bricks as blackbodies, determine the initial rate of radiation heat transfer from the coal bricks to the steaks. 21–108 A spherical tank of diameter D = 2 m that is filled with liquid nitrogen at 100 K is kept in an evacuated cubic enclosure whose sides are 3 m long. The emissivities of the spherical tank and the enclosure are ɛ = 0.1 and ɛ, = 0.8, Also, determine the initial rate of radiation heat transfer to the steaks if the side opening of the grill is covered by aluminum foil, which can be approximated as a reradiating surface. Answers: 928 W, 2085 W 914 RADIATION HEAT TRANSFER 21–119 The spectral emissivity of an opaque surface at 1500 K is approximated as Steaks E = 0 E, = 0.85 Ez = 0 1< 2 µm 2 λ 6 μ for 0.20 m for for λ>6 μη Coal Determine the total emissivity and the emissive flux of the- surface. bricks 21–120 The spectral absorptivity of an opaque surface is as shown on the graph. Determine the absorptivity of the surface for radiation emitted by a source at (a) 1000 K and (b) 3000 K. FIGURE P21–113
Transcribed Image Text:D2 = 0.4 m are maintained at uniform temperatures T, = 700 K and T, = 500 K and have emissivities & = 0.5 and ɛ, = 0.7, respectively. Determine the net rate of radiation heat transfer between the two spheres. Also, determine the convection heat transfer coefficient at the outer surface if both the surrounding medium and the surrounding surfaces are at 30°C. Assume the emissivity of the outer surface is 0.35. 21–113 Consider a circular grill whose diameter is 0.3 m. The bottom of the grill is covered with hot coal bricks at 950 K, while the wire mesh on top of the grill is covered with steaks initially at 5°C. The distance between the coal bricks and the steaks is 0.20 m. Treating both the steaks and the coal bricks as blackbodies, determine the initial rate of radiation heat transfer from the coal bricks to the steaks. 21–108 A spherical tank of diameter D = 2 m that is filled with liquid nitrogen at 100 K is kept in an evacuated cubic enclosure whose sides are 3 m long. The emissivities of the spherical tank and the enclosure are ɛ = 0.1 and ɛ, = 0.8, Also, determine the initial rate of radiation heat transfer to the steaks if the side opening of the grill is covered by aluminum foil, which can be approximated as a reradiating surface. Answers: 928 W, 2085 W 914 RADIATION HEAT TRANSFER 21–119 The spectral emissivity of an opaque surface at 1500 K is approximated as Steaks E = 0 E, = 0.85 Ez = 0 1< 2 µm 2 λ 6 μ for 0.20 m for for λ>6 μη Coal Determine the total emissivity and the emissive flux of the- surface. bricks 21–120 The spectral absorptivity of an opaque surface is as shown on the graph. Determine the absorptivity of the surface for radiation emitted by a source at (a) 1000 K and (b) 3000 K. FIGURE P21–113
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