• Title/Summary/Keyword: Binary nanoemulsion

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Droplet Size and Thermal conductivity Measurements of Binary Nanoemulsion (이성분 나노에멀전의 입도 및 열전도도 측정)

  • Cho, Chang-Hwan;Sul, Hea-Youn;Jung, Jung-Yeul;Kang, Yong-Tae
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.815-820
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    • 2009
  • Binary nanoemulsions which are defined as the, oil-droplet suspensions in binary solution ($H_2O$/LiBr), are developed to enhance the heat and mass transfer performance of absorption refrigeration systems. In this study, a novel two-step method is proposed to prepare the stable oil-in-binary solution (O/S) emulsion. Polymer is used as a steric stabilizer to stabilize the oil-droplets in a strong electrolyte ($H_2O$/LiBr). It is found that the thermal conductivity of the binary nanoemulsion is inversely proportional to the emulsion size while the concentrations of oil and $H_2O$/LiBr are less dominant for the thermal conductivity of binary nanoemulsions.

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Evaluation of Dispersion Stability and Absorption Performance Enhancement of Binary Nanoemulsion Fluids (이성분 나노에멀전 유체의 분산안정성 및 흡수성능 촉진실험)

  • Lee, Jin-Ki;Kim, Young-Jin;Shin, Myung-Chul;Kim, Se-Won;Kang, Yong-Tae
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.9
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    • pp.895-900
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    • 2012
  • This paper aims to examine the effect of nanodroplets on pool-type absorption heat transfer enhancement and to find the relationship between the dispersion stability and the absorption performance. The concentrations of oil and surfactant are considered as the key parameters. $C_{12}E_4$ and Tween20 are used as the surfactants and N-decane oil is added to the $NH_3/H_2O$ solution to make the binary nanoemulsion fluids. Binary nanoemulsion fluids are dispersed by the ultrasonic vibrator and the stirrer under specific conditions. The dispersion stability of binary nanoemulsion fluids for each oil concentrations is evaluated from the droplet size and Tyndall effect analysis. The absorption performance of binary nanoemulsion fluids is compared with the result of dispersion stability. In addition, it is found that the binary nanoemulsion fluid is a strong candidate as a new working fluid for absorption applications.