Agricultural Engineering > GATE 2015 > Evaporators
A single effect long-tube evaporator has ten tubes each of 2.5 cm diameter and 6 m length. It concentrates pineapple juice from 18 °Brix to 23 °Brix. The feed rate into the evaporator is 557 kg h⁻¹ at the boiling point of 70 °C (latent heat of vaporization = 2333.82 kJ kg⁻¹). Neglecting boiling point rise, the overall heat transfer coefficient in W m⁻² K⁻¹ for 12 °C temperature gradient across the tube walls is _______.
Correct : 1385
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