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  3. 2. initially, the steel sphere with a diameter of

2. Initially, the steel sphere with a diameter of 15 cm with a temperature of 200°C...

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Mechanical Engineering

2. Initially, the steel sphere with a diameter of 15 cm with atemperature of 200°C was left to cool in the airflow at atemperature of 6 m/s. By making the necessary acceptances,calculate the amount of time the aluminum sphere will fall to atemperature of 50°C.

The relevant correlation for forced transport on the sphere;

NuD = 2 + (0.4 ReD 0.5+ 0.06 ReD 2/3) Pr 0.6 (μo/μy)1/4

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