Sequential Production of mm-Sized Spherical Shells in Liquid-Liquid Gas Systems

Abstract

A new device has been developed for sequential production of mm-sized solid spherical shells using liquid-liquid gas systems. This device comprises a cylindrical vessel, for containing two kinds of immiscible liquids, and a gas injection orifice, set at the center of the vessel’s bottom. Solid spherical shells are successfully and sequentially produced by solidifying rising liquid spherical shells, formed sequentially at the horizontal interface between two immiscible liquids.

A study of an arbitrary Stokes flow past a fluid coated sphere in a fluid of a different viscosity

“…Spherical solid shells coated with a thin layer of a fluid which are produced by solidifying liquid shells have applications in high performance solid fuels, artificial organs with filtration, high functional medicines, foods and compound structural materials which were discussed by Lee et al [15] and Kawano et al [11]. Kawano et al [12] discussed the sequential production of spherical rigid shells by solidifying liquid shells. Kondo and Koishi [14] discussed the production of multilayer rigid shells or balls with diameter of micrometer size called microcapsules by controlling the interfacial polymerization in the physicochemical method.…”

Feasibility of N2/sunflower oil compound drop formation in methanol induced by bubble train

“…A bubble train can also perform the penetration if the total buoyancy force acting on it is sufficient. A successful penetration can cause a transport of a lower liquid into an upper liquid in the form of entrained droplets following behind the bubble (Greene et al 8 , Reiter and Schwerdtfeger, 9 Kemiha et al 10 and Dietrich et al 11 ) or a lower liquid film engulfing around the bubble (Hashimoto and Kawano, 12 Kawano et al 13,14 ). The results for the dynamic cases obtained from this work appear also to support the earlier predictions based on the static compound drop configurations.…”

Deformations of thin liquid spherical shells in liquid-liquid-gas systems

“…[22][23][24][25][26][27][28][29][30][31] Therefore, it is necessary to investigate deformation characteristics and heat/mass transfer characteristics around liquid shells moving at intermediate Reynolds numbers to develop an effective solidification system for liquid shells. 8 This study addresses deformation of a liquid shell in a uniform stream numerically as a moving boundary problem of incompressible Navier-Stokes equations. Here, based on the previous experimental result, 8 thickness of the liquid shell is assumed to be very thin, particularly in the case of a molten metal shell.…”

“…8 This study addresses deformation of a liquid shell in a uniform stream numerically as a moving boundary problem of incompressible Navier-Stokes equations. Here, based on the previous experimental result, 8 thickness of the liquid shell is assumed to be very thin, particularly in the case of a molten metal shell. The flow field around the deformed liquid shell and the shell shape are obtained as steady solutions.…”

“…[3][4][5] Furthermore, spherical solid shells, which are produced by solidifying liquid shells, are applicable to high-performance solid fuels, artificial organs with filtration, lightweight structural materials, storage systems for energy and environmental pollutants, and buoyant catalytic agents. [6][7][8] However, although the much smaller microcapsules can be produced chemically, mass production of the millimeter-sized shells using fluid dynamical techniques is quite difficult mainly because of gravitational force and decrease of interfacial tension effects as a result of their relatively large radius. We investigated the unique phenomenon whereby the liquid spherical shells are produced sequentially in liquid-liquid-gas systems under specific conditions of gas flow rate and the liquid physical properties as shown in Fig.…”