Breakup of Oil-in-Water Emulsion Droplets in Microchannel Array Devices at Low Applied Pressures

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Isao Kobayashi¹  Kunihiko Uemura¹  Mitsutoshi Nakajima¹ 

[1] Food Engineering Division, National Food Research Institute

关键词: Microchannel Array;    Droplet Breakup;    High-Speed Observation;    Microchannel Emulsification;    Monodisperse Emulsion;   

DOI  :  10.1252/jcej.07WE240

来源: Maruzen Company Ltd

【 摘 要 】

References(24)The breakup phenomena of large oil-in-water (O/W) emulsion droplets in silicon microchannel (MC) array devices at low applied pressures were investigated by microscopic and high-speed observations. This study used two sizes of MC arrays, each of which consisted of uniformly sized MCs, slit-like terraces, and deeply etched wells. Monodisperse feed O/W emulsion droplets that had entered the MC arrays were broken up into fine droplets primarily by snap-off that occurs due to localized shear inside the MCs and by pinch-off due to interfacial tension effects inside the MCs or on the inlet side of a terrace. The average droplet size of the permeate O/W emulsions depended significantly on the MC size and exceeded the MC size by 1.2 to 1.4 times. Their coefficients of variation were 18% to 21%. The results obtained from preceding work were compared with the results for direct generation of O/W emulsion droplets using the same MC array device.

【 授权许可】

Unknown