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A spherical device with 20 mm outer radius has to be covered with an insulation (k=0.2 W/mK). The atmosphere heat convection coefficient is h= 10 W/ K. Find the thickness of insulation for maximum heat transfer?
  • a)
    10mm
  • b)
    20mm
  • c)
    0 mm
  • d)
    None
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A spherical device with 20 mm outer radius has to be covered with an ...
critical radius for sphere = 2k/h
=40mm
thickness = 40 - 20 = 20mm
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A spherical device with 20 mm outer radius has to be covered with an insulation (k=0.2 W/mK). The atmosphere heat convection coefficient is h= 10 W/ K. Find the thickness of insulation for maximum heat transfer?a)10mmb)20mmc)0 mmd)NoneCorrect answer is option 'B'. Can you explain this answer?
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