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###### 1. Quenching is a widely used method to increase yield strength and hardness of various materials....

1. Quenching is a widely used method to increase yield strength and hardness of various materials. During this process, beside water and oil, air is also a widely used cooling fluid. With a knowledge of 4.5 °C/s average cooling rate's generating optimal results, determine the required roller diameter for this cooling rate of ductile iron from 825 °C to 300 °C while falling in 20 °C air with a speed of 1 m/s. Notes: - Use one of the suitable empirical correlations for convection coefficient around the cylindrical roller in crossflow. -Show validity of your assumptions and empirical correlations. -Refer the source of each property data that you use.

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