A 5 mm diameter spherical ball at 50 deg C is covered by a 1 mm thick plastic insulation (k 0 13 W m middot K) The ball is exposed to a medium at 15 deg C, with a combined convection and radiation heat transfer coefficient of 20 W m 2 middot K Determine if the plastic insulation on the ball will he...

A spherical ball is covered with 1mm thick plastic insulation It is to be determi ...

A 5-mm-diameter spherical ball at 50°C is covered by a 1-mm-thick plastic insulation (k = 0.13 W/m·K).

Question:

A 5-mm-diameter spherical ball at 50°C is covered by a 1-mm-thick plastic insulation (k = 0.13 W/m·K). The ball is exposed to a medium at 15°C, with a combined convection and radiation heat transfer coefficient of 20 W/m²·K. Determine if the plastic insulation on the ball will help or hurt heat transfer from the ball.

Plastic Insulation 5 mm 1 mm