Thermal conductivity enhancement of ZnO nanofluid using a one-step physical method

Gyoung Ja Lee, Chang Kyu Kim, Min Ku Lee, Chang Kyu Rhee, Seokwon Kim, Chongyoup Kim

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

In the present work, an ethylene-glycol (EG) based nanofluid containing ZnO nanoparticles was prepared by a one-step physical method known as pulsed-wire evaporation (PWE). The structural properties of the ZnO nanoparticles were studied by X-ray diffraction method and high-resolution transmission electron microscopy. The thermal conductivity of the EG-based ZnO nanofluid at a higher concentration exhibited temperature-dependency due to the clustering and aggregation of nanoparticles in the fluid. Moreover, the experimentally measured value of the thermal conductivity was higher than the theoretically calculated value based on the Hamilton-Crosser model. From an analysis of the rheological behavior, it was found that all of the nanofluids showed Newtonian behavior. The viscosity increment did not show temperature-dependency, and its value increased with the ZnO volume fraction at a fixed temperature.

Original languageEnglish
Pages (from-to)24-27
Number of pages4
JournalThermochimica Acta
Volume542
DOIs
Publication statusPublished - 2012 Aug 20

Fingerprint

Thermal conductivity
thermal conductivity
Ethylene Glycol
Nanoparticles
Ethylene glycol
nanoparticles
augmentation
glycols
ethylene
High resolution transmission electron microscopy
Temperature
temperature
Structural properties
Volume fraction
Evaporation
Agglomeration
evaporation
wire
Wire
Viscosity

Keywords

  • Nanofluid
  • Pulsed wire evaporation
  • Thermal conductivity
  • Viscosity
  • ZnO

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Instrumentation

Cite this

Thermal conductivity enhancement of ZnO nanofluid using a one-step physical method. / Lee, Gyoung Ja; Kim, Chang Kyu; Lee, Min Ku; Rhee, Chang Kyu; Kim, Seokwon; Kim, Chongyoup.

In: Thermochimica Acta, Vol. 542, 20.08.2012, p. 24-27.

Research output: Contribution to journalArticle

Lee, Gyoung Ja ; Kim, Chang Kyu ; Lee, Min Ku ; Rhee, Chang Kyu ; Kim, Seokwon ; Kim, Chongyoup. / Thermal conductivity enhancement of ZnO nanofluid using a one-step physical method. In: Thermochimica Acta. 2012 ; Vol. 542. pp. 24-27.
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