Question: URGENT! PLEASE ANSWER STEP BY STEP Milk is extremely perishable. The removal of water could help to prevent the growth of micro-organisms and facilitate preservation

URGENT! PLEASE ANSWER STEP BY STEP

Milk is extremely perishable. The removal of water could help to prevent the growth of micro-organisms and facilitate preservation of milk constituents. In dairy processing plant, the milk is dried in a spray dryer to produce milk powder. Depending on the nozzle operating conditions, the diameter of the atomized milk droplet that falls through the hot air in the spray dryer may vary from 100m to 300m. The relative velocity between the hot air and the droplet is 50m/s. The hot air temperature is 180C and the surface temperature of the milk droplet is 60C. a. Analyse the effect the droplet diameter on the convective mass transfer coefficient. (10 marks) b. Compare the effect of increasing the droplet diameter to the effect of increasing the velocity of hot air on the evaporation flux. (10 marks) [Total =20 marks ]

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