Question: Calculate the mass transfer coefficient, ky, during the spray drying of soluble coffee. The average air temperature during drying is 110C and the air flows

Calculate the mass transfer coefficient, ky, during the spray drying of

Calculate the mass transfer coefficient, ky, during the spray drying of soluble coffee. The average air temperature during drying is 110C and the air flows with velocity of 0.51m/s countercurrently to atomize coffee droplets which are 150m in diameter. Assume that the droplets are uniform in size, neither swell nor shrink and DAB=2.6105m2/s. Air density and viscosity can be taken as 0.922kg/m3 and 22.17106Pa.s(ky=0.0165kgmol/m2.s)

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