(Solution) - In a manufacturing process a long coated plastic rod p 2200 -(2025 Original AI-Free Solution)

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In a manufacturing process, a long coated plastic rod (p = 2200 kg/m J ? c = 800 J/kg ? K, k =1 W/m ? K) of diameter D = 20 mm is initially at a uniform temperature of 25°C and is suddenly exposed to a cross flow of air at T? = 350°C and V = 50 m/s.
(a) How long will it take for the surface of the rod to reach 175°C, the temperature above which the special coating will cure?
(b) Generate a plot of the time-to-reach 175°C as a function of air velocity for 5 < V < 50 m/s.