The heat and mass transfer rate is a function of temperature, humidity, air transfer characteristics around each droplet, droplet diameter, and relative velocity between droplets and air. The droplet drying process can be divided into two stages, namely the stage of constant rate of drying, and the drying phase, the actual evaporation time required for droplet and contact temperature of the air, depending on the droplet shape, chemical composition, physical structure and solid concentration. The actual evaporation time is the sum of the constant speed drying time and the drying time at which the required moisture content is reduced.
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