Mass Transfer and Diffusion

Na = kcA(cai – ca) Na = kcAΔc Na = kcA(cai – ca)mean Na = kcA(cai – ca)log mean hµ/k hρ/k hL/k hΔTL/k Ratio of convective heat transfer to conductive heat transfer Ratio of convective heat transfer to conductive heat transfer Ratio of total heat transfer to conductive heat transfer Ratio of total transfer to convective heat transfer Npr = Cpµ/k Npr = Cpk/µ Npr = Cvµ/k Npr = Cpµ Momentum conductivity and thermal conductivity Coefficient of convection to thermal conductivity Momentum diffusivity and thermal diffusivity Interfacial force and viscous force µd2uy/dx2 + ρg =0 µd2uy/dy2 + ρg =0 µd2uy/dz2 + ρg =0 µd2uy/dx2 = 0 Gravitational force and interfacial force Interfacial force and viscous force Thermal conductivity and electrical conductivity Conduction and convection 8 16 25 50 3 2500 5000 78 500 700 2500 6000 Slow mass transfer Less mass transfer Eddy currents Eddy diffusion It is drag force divided by projected area and velocity head It is the ratio of pipe wall shear stress and velocity head It is the ratio of inertial forces to viscous force It is the ratio of inertial force to surface tension force It is drag force divided by projected area and velocity head It is the ratio of pipe wall shear stress and velocity head It is the ratio of inertial forces to viscous force It is the ratio of inertial force to surface tension force It is the ratio of bulk transfer mass and molecular diffusion It is the ratio of thermal diffusivity to mass diffusivity It is the ratio of conductive mass transfer to molecular diffusion It is the ratio of mass transfer to mass capacity

3 less than re less than 1200

3 less than re less than 1600

25 less than re less than 1200

8 less than re less than 1200