The schlieren system was used to capture the onset of transition to turbulence and the interfacial turbulence in desorbing surface of tension-lowering solutes from aqueous solution. Convective structure in ethanol-water solution

isopropanol-water solution and acetone-water solution was alike. When the mass transfer process started

a rapidly growing turbulent region was observed on the surface. Several small round cells appeared on the edge of the expanding turbulent region. These small cells gradually developed into polygon structures as reported by many investigators. After the short instability process

the structures changed into ring-like shapes. In ethyl acetate-water solution

the structures remained clustered shape

and turbulence intensity was stronger. Structural features and turbulence intensity of interfacial convection depended on experimental operating conditions and physical properties of the system.