Quartz-glass spheres 2 cm in diameter and initially at 70C are cooled by a large toluene stream

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Quartz-glass spheres 2 cm in diameter and initially at 70°C are cooled by a large toluene stream at 20°C flowing over the spheres at a velocity of 0.01 m/s. Determine:

(a) The heat transfer coefficient at the solid/toluene interface.

(b) The time required to lower the temperature at center of the spheres to 25°C.

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