A curved channel duct is designed, built and used specifically to produce Dean vortices as a result of flow around a 180℃ curve. We present evidence using optical reflection of the existmace of the vortices in the curved section and following flat section. Also, three different feed soludons(DI water, a monodispersed styrene-divinyl-benzene latex particle suspension and a yeast suspension) were used to determine the effectiveness of Dean instabilities to destabilize polarization layers. For each suspension, the flux data were compared as a function of time for flow conditions with and without Dean vortices, for a 0.2μm microfiltration membrane. Any permeation flux improvement was not sustained for 2.0Dec due to the vortex-decay in the flat section after the curved channel, but a 15~30% permeation improvement was obtained for 3.8Dec

• Chung Kun Yong(KIST, CFC 대체기술센터, 분리공정연구실) | 정건용
• Belfort Georges(Rensselaer 공대 화공과) | Georges Belfort