A Simple Method for Calculation of the Permeability Coefficient of Porous Media

摘要: orous media, such as paper andpaperboard, contain small openspaces, voids and pores, distributedthroughout solid matrices [6].Adsorption absorption of liquidsthrough these pores have repercussionswith respect to the barrier propertiesand ultimate strength thesheet [7-9].Moreover,the aneffect on interaction between print-ing inks [10-12].Paper is laminated,surface sized orextruded with a variety film formersand plastics lower its permeability tomoisture,water vapor,water othersolvents,and internally toprevent excessive spreading [13-15].In addition,in many converting op-erations,where liquids are forced into by action nip,the porousstructure base sheet important.Thus,the characterization porousproperty,i.e.,permeability,is major im-portance for predicting andprinting properties products.PERMEABILITY AND POROSITYPermeability most importantphysical property porous medi-um, while porosity mostimportant geometrical property. Thepermeability describes conductivi-ty medium tofluid flow,whereas meas-ure fluid storage capacity aporous material. Permeabilitydescribes how easily able tomove through material.Thus, it related connected-ness void spaces thepore size paper. It calculatedusing formula widely known asDarcy’s Law [1].For quality control, units meas-urement may be irrelevant, but sci-entific research essential ableto express results in absolute [3].Permeability measurements expressedin airflow or time cannot becompared directly pore dimen-sions.For this reason,there need forcalculating ap-propriate units,which area squareof length.As such,it can interpretedin terms an effective capillary crosssectional diameter [16].DARCY’S LAWCurrent equations describing fluidtransport media basedon semi-empirical derivedin 19th century Darcy [1] forsingle- phase flow 20th cen-tury multi-phase flow.These equa-tions describe average behavior ofa mixture andone more fluids. Darcy’s lawdescribes kinetics flowthrough thedriving force ofthe medium.Darcy’s ( 1 )Where:Q = rate (m