Mass Transfer Characteristics through Alumina Membranes with Different Pores Sizes and Porosity

Different membranes covering the macroporous to nano-pororous range and having different porosities have been used study mass transfer of methane carbon dioxide single gases. The effect flow parameters on transport mechanisms through porous were reviewed in detail. characteristics gas macroporous, microporous, nano-porous investigated with several diffusion models 20–100 ◦C at pressure differences ranging from 0.2 3 bar. experimental permeation data analyzed using Darcy model. results clearly showed good agreement between model analysis data. that followed a parallel which behavior gases was governed by viscous Knudsen diffusion, although varied degrees. Permeation each membrane varies considering viscosity same temperature. Furthermore, configurational permeance increased increasing decreasing For measurements diameters 6000nm 15nm, indicate flux agrees well calculated (model) flows bulk stream shell side outer surface where coexist. shows is larger than contribution increases decrease diameter. On other hand, effects slippage are considerable as velocity near wall higher zero. slip length inversely proportional pore size driving pressure.