Question: 1. Apples, which may be considered as being spherical in shape with a diameter of 8 cm, are exposed to medium at -18 C. Determine

1. Apples, which may be considered as being spherical in shape

1. Apples, which may be considered as being spherical in shape with a diameter of 8 cm, are exposed to medium at -18 C. Determine whether the apples will be frozen at the end of 1 hour, if they were initially at a uniform temperature of 25 C and the convective heat transfer coefficient is 10 W/mK. (Properties of the apple: p = 840 kg/m, cp = 3.81 kJ/kg.K, k = 0.418 W/m.K, and a = 1.3x10-7 m/s)

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