In a production facility, 3-cm-thick large brass plates (k = 110 W/m · °C, ρ = 8530 kg/m3, cp = 380 J/kg · °C, and α = 33.9 × 10–6 m2/s) that are initially at a uniform temperature of 25°C are heated by passing them through an oven maintained at 700°C. The plates remain in the oven for a period of 10. min. Taking the convection heat transfer coefficient to be h = 80 W/m2 · °C, determine the surface temperature of the plates when they come out of the oven.
FIGURE P18-39
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