Numerical design of ammonia bubble absorber applying binary nanofluids and surfactants

Jin Kyeong Kim, Atsushi Akisawa, Takao Kashiwagi, Yong Tae Kang

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The objectives of this paper are to analyze the combined heat and mass transfer characteristics for the ammonia bubble absorption process and to study the effects of binary nanofluids and surfactants on the absorber size. The ammonia bubble absorbers applying binary nanofluids and surfactants are designed and parametric analyses are performed. In order to express the effects of binary nanofluids and/or surfactants on the absorption performance, the effective absorption ratios for each case are applied in the numerical model. The values of the effective absorption ratio are decided from the previous experimental correlations. The kinds and the concentrations of nano-particles and surfactants are considered as the key parameters. The considered surfactants are 2-ethyl-1-hexanol (2E1H), n-octanol, and 2-octanol and nano-particles are copper (Cu), copper oxide (CuO), and alumina (Al2O3). The results show that the application of binary nanofluids and surfactants can reduce the size of absorber significantly. In order to reach 16.5% ammonia solution under the considered conditions, for example, the addition of surfactants (2E1H, 700 ppm) can reduce the size of absorber up to 63.0%, while the application of binary nanofluids (Cu, 1000 ppm) can reduce it up to 54.4%. In addition, it is found that the effect of mass transfer resistance is more dominant than that of heat transfer resistance. That is, the enhancement of mass transfer performance is more effective than that of heat transfer performance.

Original languageEnglish
Pages (from-to)1086-1096
Number of pages11
JournalInternational Journal of Refrigeration
Volume30
Issue number6
DOIs
Publication statusPublished - 2007 Sep 1
Externally publishedYes

Fingerprint

bubbles
Ammonia
Surface-Active Agents
surfactants
Surface active agents
ammonia
mass transfer
heat transfer
octanol
Mass transfer
Hot Temperature
Heat transfer
Copper
copper
1-Octanol
Copper oxides
aluminum oxide
Aluminum Oxide
nanofluids
Oxides

Keywords

  • Absorption
  • Absorption system
  • Additive
  • Ammonia-water
  • Bubble
  • Design
  • Heat transfer
  • Mass transfer
  • Modelling

ASJC Scopus subject areas

  • Food Science
  • Mechanical Engineering

Cite this

Numerical design of ammonia bubble absorber applying binary nanofluids and surfactants. / Kim, Jin Kyeong; Akisawa, Atsushi; Kashiwagi, Takao; Kang, Yong Tae.

In: International Journal of Refrigeration, Vol. 30, No. 6, 01.09.2007, p. 1086-1096.

Research output: Contribution to journalArticle

Kim, Jin Kyeong ; Akisawa, Atsushi ; Kashiwagi, Takao ; Kang, Yong Tae. / Numerical design of ammonia bubble absorber applying binary nanofluids and surfactants. In: International Journal of Refrigeration. 2007 ; Vol. 30, No. 6. pp. 1086-1096.
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