3-96 A 0.21-cm-diameter electrical wire at 32°C is covered by 0.05-cm-thick plastic insulation (k = 0.13 W/m·°C). The wire is exposed to a medium at 10°C, with a combined convection and radiation heat transfer coefficient of 14 W/m²·°C. Determine if the plastic insulation on the wire will increase or decrease heat transfer from the wire.
3-97 Repeat Prob. 3-96. assuming a thermal contact resistance of 0.000176 m²·°C/W at the interface of the wire and the insulation.