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During the final stages of heat treatment of a AISI 347 Stainless Steel sphere of 30 cm diameter the temper- ature of sphere must be

During the final stages of heat treatment of a AISI 347 Stainless Steel sphere of 30 cm diameter the temper- ature of sphere must be maintained uniform throughout. The final stage is indicated by cooling from 600 K to 300 K. If you want the cooling process to be done by pure convection, what should be the maximum allowable convection coefficient?

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