PERFORMANCE OF NANOPOROUS FILTRATION MEMBRANE WITH CONICAL PORES: FOR A LIQUID-PARTICLE SEPARATION

摘要

An analysis was developed for the flow resistance of the nanoporous filtration membrane with conical pores for a liquid-particle separation, based on the nanoscale flow model. The calculation results show that there exists the optimum cone angle of the conical pore which gives the lowest flow resistance and thus the highest flux of the membrane; This optimum cone angle of the conical pore depends on the radius of the small opening of the conical pore, the passing liquid-pore wall interaction and the membrane thickness. The equations were regressed out for calculating this optimum cone angle respectively for weak, medium and strong liquid-pore wall interactions. For the optimum cone angle of the conical pore, the dimensionless minimum flow resistance of the membrane was calculated and it is only dependent on the radius of the small opening of the conical pore and the passing liquid-pore wall interaction; The corresponding equations were regressed out for calculating the dimensionless minimum flow resistance of the membrane respectively for weak, medium and strong liquid-pore wall interactions.