Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Flow Characteristics of Al2O3 Nanofluids with Nanoparticles of Various Shapes

나노입자 형상 변화에 따른 알루미나 나노유체의 유동 특성

  • Hwang, Kyo-Sik (School of Aerospace and Mechanical Engineering, Korea Aerospace Univ.) ;
  • Ha, Hyo-Jun (School of Aerospace and Mechanical Engineering, Korea Aerospace Univ.) ;
  • Jang, Seok-Pil (School of Aerospace and Mechanical Engineering, Korea Aerospace Univ.)
  • 황교식 (한국항공대학교 항공우주 및 기계공학부) ;
  • 하효준 (한국항공대학교 항공우주 및 기계공학부) ;
  • 장석필 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2010.10.22
  • Accepted : 2010.11.16
  • Published : 2011.03.01
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Abstract

To study the flow characteristics of water-based $Al_2O_3$ nanofluids according to the shape of the nanoparticles, we measure the pressure drop in a fully developed laminar flow regime. Water-based $Al_2O_3$ nanofluids of 0.3 Vol.% with sphere-, rod-, platelet-, and brick-shaped nanoparticles are manufactured by the two-step method. Zeta potential is measured to examine the suspension and dispersion characteristics, and TEM image is considered to confirm the shape characteristics of the nanoparticles. The experimental results show that the pressure drop of $Al_2O_3$ nanofluids depends on the shape of the nanoparticles although the nanofluids has same volume fraction of nanoparticles. This is explained by the surface area per unit mass of the nanoparticles and the size of the nanoparticles suspended in the base fluids.

본 연구에서는 다양한 형상의 나노입자를 분산시킨 알루미나 나노유체의 유동 특성을 실험적으로 조사하기 위하여 나노입자의 형상 변화에 따른 알루미나 나노유체의 압력강하를 층류영역에서 측정하였다. 이를 위해 Sphere, Rod, Platelet, 그리고 Brick 의 형태를 갖는 알루미나 나노입자를 물에 분산시켜 부피비 0.3%를 갖도록 Two-step 방법으로 제작하였다. 제작된 나노유체의 분산성을 파악하기 위하여 제타포텐셜을 조사하였으며, 나노입자의 형상을 파악하기 위하여 TEM 사진을 측정하였다. 다양한 형상의 나노입자를 분산시켜 0.3%의 부피비를 갖는 나노유체의 압력강하를 측정하였을 때, 입자 형상이 나노유체의 유동특성에 영향을 미치는 것을 확인하였다. 실험 결과를 바탕으로 나노입자의 단위질량당 표면적과 분산된 나노입자의 크기를 이용하여 나노유체의 압력강하 특성을 설명하였다.

Keywords

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