Thermal conductivity enhancement of binary nonoemulsion(O/S)

Hea Youn Sul, Jung Yeul Jung, Yong Tae Kang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Binary nanoemulsions, nano-sized oil-droplet suspensions in binary solution (H2O/LiBr), are developed to enhance the heat and mass transfer performance of absorption refrigeration systems. In this study, a novel four-step method is proposed to prepare the stable oil-in-binary solution (O/S) emulsion. To stabilize the nanoemulsions in a strong electrolyte, a polymeric stabilizer (Gum Arabic) is used as a steric stabilizer. The droplet size and the thermal conductivity of binary nanoemulsions are measured by the dynamic light scattering method and the transient hot-wire method, respectively. It is concluded that the ratio of 2:1 (oil: surfactant) is the best condition for distribution stability. It is also found that the measured thermal conductivity of the oil-in-water nanoemulsion enhances up to 6.4 % at 0.1 vol% of oil, and the binary nanoemulsion enhances up to 3.6 % at 1.0 vol % of oil in 30 wt % H2O/LiBr compared with the estimated one from the Maxwell's model. This result is compared with electric conductivity of LiBr solution and it is found both conductivities have similar trend. It is finally proposed that the thermal conductivity of the binary nanoemulsion could be enhanced by adding nano-sized droplets of n-decane oil, which has a lower thermal conductivity than that of the base fluid.

Original languageEnglish
Title of host publication2010 14th International Heat Transfer Conference, IHTC 14
Pages625-630
Number of pages6
Volume6
DOIs
Publication statusPublished - 2010 Dec 1
Externally publishedYes
Event2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, United States
Duration: 2010 Aug 82010 Aug 13

Other

Other2010 14th International Heat Transfer Conference, IHTC 14
CountryUnited States
CityWashington, DC
Period10/8/810/8/13

Keywords

  • Absorption system
  • Electric conductivity
  • Emulsion
  • Stability
  • Thermal conductivity
  • Water-lithium bromide

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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  • Cite this

    Sul, H. Y., Jung, J. Y., & Kang, Y. T. (2010). Thermal conductivity enhancement of binary nonoemulsion(O/S). In 2010 14th International Heat Transfer Conference, IHTC 14 (Vol. 6, pp. 625-630) https://doi.org/10.1115/IHTC14-22556