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Find the solidification time of the two iron castings when both are poured (with no
superheats) into the sand molds at initial temperature 28 C.
(i) A slab shaped casting of 10 cm thickness, (ii) a sphere of 10 cm in dia.
Iron: freezing temp: 1540 C; L= 272 kJ/kg; density = 7850 kg/m3
Sand: c = 1.17 kJ/kg-K; k = 0.865 W/mk; density = 1600 kg/m3

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