Taiwan Mechanical Engineering Technologist Examination

Practice session

According to Chvorinov's rule for metal casting, total solidification time is given by ts = B * (V / A)², where B is the mold constant, V is casting volume, and A is surface area. If a spherical casting and a cubic casting made of the same alloy are poured into identical sand molds and have identical volume (V), what is the approximate ratio of their solidification times (ts,sphere / ts,cube)?

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