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A solid sphere (ε1 = 0.8) of radius, r1 = 15 cm maintained at 700 K and is placed concentrically inside a hollow sphere (ε2  = 0.6) of radius r2 = 25 cm maintained at 500 K as shown in figure.

The net radiative heat transfer from surface 1 to 2 is (Stefan- Boltzmann constant = 5.67×10-8 W/m2K4)
  • a)
    1.91 kW
  • b)
    5.81 kW
  • c)
    10.07 kW
  • d)
    2.85 kW
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A solid sphere (ε1= 0.8) of radius, r1= 15 cm maintained at 70...
Given, ε1 = 0.8, ε
2
 = 0.6, r1 = 0.15 m, r2 = 0.25 m T1 = 700 K, T2 =500 K, σ =5.67×10-8 W/m2K4
A1 = 4πr12 = 4π×0.152 = 0.283 m2,
A2 = 4πr22 = 4π×0.252 = 0.785 m2

Radiative heat transfer from surface 1 to 2,

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A solid sphere (ε1= 0.8) of radius, r1= 15 cm maintained at 700 K and is placed concentrically inside a hollow sphere (ε2= 0.6) of radius r2= 25 cm maintained at 500 K as shown in figure.The net radiative heat transfer from surface 1 to 2 is (Stefan- Boltzmann constant = 5.67×10-8W/m2K4)a)1.91 kWb)5.81 kWc)10.07 kWd)2.85 kWCorrect answer is option 'A'. Can you explain this answer?
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A solid sphere (ε1= 0.8) of radius, r1= 15 cm maintained at 700 K and is placed concentrically inside a hollow sphere (ε2= 0.6) of radius r2= 25 cm maintained at 500 K as shown in figure.The net radiative heat transfer from surface 1 to 2 is (Stefan- Boltzmann constant = 5.67×10-8W/m2K4)a)1.91 kWb)5.81 kWc)10.07 kWd)2.85 kWCorrect answer is option 'A'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about A solid sphere (ε1= 0.8) of radius, r1= 15 cm maintained at 700 K and is placed concentrically inside a hollow sphere (ε2= 0.6) of radius r2= 25 cm maintained at 500 K as shown in figure.The net radiative heat transfer from surface 1 to 2 is (Stefan- Boltzmann constant = 5.67×10-8W/m2K4)a)1.91 kWb)5.81 kWc)10.07 kWd)2.85 kWCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A solid sphere (ε1= 0.8) of radius, r1= 15 cm maintained at 700 K and is placed concentrically inside a hollow sphere (ε2= 0.6) of radius r2= 25 cm maintained at 500 K as shown in figure.The net radiative heat transfer from surface 1 to 2 is (Stefan- Boltzmann constant = 5.67×10-8W/m2K4)a)1.91 kWb)5.81 kWc)10.07 kWd)2.85 kWCorrect answer is option 'A'. Can you explain this answer?.
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