セルロース分散流中のナノ繊維静電配向に関する数値シミュレーション

抄録

Cellulose Nano-fibrils (CNFs) are the fundamental building blocks of wood and paid special attentions because of their outstanding mechanical and thermal propeties. The mechanical properties of cellulose filament made from CNFs can be improved by their orientation control. In this study, the complex behavior of CNFs in the elongational flow and electric field were clarified by solving the equation of motion for indivisual CNFs. When the electric field of 700 V/cm is applied for 1 μm CNF in the upstream of flow focusing point, the CNF order parameter increases from 0.15 to 0.33 between the electrodes and then decreases to 0.26 by Brownian rotation at 5 mm downstream of the electrode. The CNF order parameter increases by injection of sheath flow and separation of CNF dispersion from the wall. The maximum order parameter of 1 μm CNF increases from 0.45 to 0.52 in the elongation flow with upstream electrostatic alignment.