A long cylinder of 30-mm diameter, initia1ly at a uniform temperature of 1000 K. is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are k = 1.7 W/m ú? K, c = 1600 J/kg ú? K, and p = 400 kg/m3, while the convection coefficient is 50 W/m2 ú? K. (a) Calculate the time required for the surface of the cylinder to reach 500 K. (b) Compute and plot the surface temperature history for 0 < t=>< 300s.= if= the= oil= were= agitated,= providing= a= convection= coefficient= of= 250= w/m2= ú?= k,= how= would= the= temperature= history= change?=>
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