Spherical glass beads coming out of a kiln are allowed to cool in a room temperature of 30°C. A glass bead with a diameter of 10 mm and an initial temperature of 400°C is allowed to cool for 3 minutes. If the convection heat transfer coefficient is 28 W/m2 ·K. determine the temperature at the center of the glass bead using (a) Table 18-2 and (b) the Heisler chart (Figure 18-17). The glass bead has properties of ρ = 2800 kg/m3 , cp = 750 J/kg·K, and k = 0.7 W/m·K.
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