Logarithmic mean sectional area

O. Shell side of microporous hollow fiber module for solvent extraction Na, = V[dha-)/L]N%N°s M Nsh- D Nlt = K = overall mass-transfer coefficient (3 = 5.8 for hydrophobic membrane. (3 = 6.1 for hydrophilic membrane. [E] Use with logarithmic mean concentration difference. dh = hydraulic diameter 4 x cross-sectional area of flow wetted perimeter (p = packing fraction of shell side. L = module length. Based on area of contact according to inside or outside diameter of tubes depending on location of interface between aqueous and organic phases. Can also be applied to gas-liquid systems with liquid on shell side. [118]... [Pg.70]

In the case where the equilibrium curve is straight, the logarithmic mean driving potential (which is similar to the log-mean temperature difference used in heat transfer calculations) can be used to calculate the mass transfer rates in the column. The mass transfer rate r (kg or kmol h-1) in a column of height Z per unit cross-sectional area of the column is given by ... [Pg.89]

Conductive heat transfer through concentric circular surfaces is very common. Examples include tubing, piping, equipment surfaces, and insulation. Here, a logarithmic-mean cross-sectional area should be used ... [Pg.1064]