Question: solve in 60 mins I will thumb up Question #4: 25 Marks) Air at 100C and 1 atm flows at a Reynolds number of 70,000

solve in 60 mins I will thumb up

Question #4: 25 Marks) Air at 100C and 1 atm flows at a Reynolds number of 70,000 normal to 3cm diameter made of naphthalene. Determine 1. The mass transfer coefficient ke 2. The molar flux of sublimation of naphthalene if the naphthalene concentration in air bulk flow is 0.258x10-4 kmol/m?. Properties of air and naphthalene: Air viscosity: 0.0215x10-3 kg/m.s Molar density of air: 0.0327kmol/m3 and Mw(air)=29 g/mol. Vapor pressure: 12 mmHg Diffusivity of naphthalene in air: 0.94x10-5m sec Chilton-Colburn correlation: jp = kop (Sc)2/3 = 0.0266 Re-0195 for 40,000

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