Temperature effect on microchannel oil-in-water emulsification |
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Authors: | Katerina Butron Fujiu Isao Kobayashi Kunihiko Uemura Mitsutoshi Nakajima |
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Affiliation: | (1) Food Engineering Division, National Food Research Institute, 2-1-12 Kannondai, Tsukuba Ibaraki, 305-8642, Japan;(2) Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba Ibaraki, 305-8572, Japan; |
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Abstract: | Microchannel (MC) emulsification is a promising technique to produce monodisperse emulsions by spontaneous interfacial-tension-driven
droplet generation. The purpose of this study was to systematically characterize the effect of temperature on droplet generation
by MC emulsification, which is a major uncharted area. The temperature of an MC emulsification module was controlled between
10 and 70°C. Refined soybean oil was used as the dispersed phase and a Milli-Q water solution containing sodium dodecyl sulfate
(1 wt%) as the continuous phase. Monodisperse oil-in-water (O/W) emulsions with a coefficient of variation below 4% were produced,
and at all the operating temperatures, their average droplet diameter ranged from 32 to 38 μm. We also investigated the effect
of flow velocity of the dispersed phase on droplet generation characteristics. The maximum droplet generation rate (frequency)
from a channel at 70°C exceeded that at 10°C by 8.1 times, due to the remarkable decrease in viscosity of the two phases.
Analysis using dimensionless numbers indicated that the flow of the dispersed phase during droplet generation could be explained
using an adapted capillary number that includes the effect of the contact angle of the dispersed phase to the chip surface. |
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