화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.26, No.2, 354-358, March, 2009
DOI10.1007/s11814-009-0059-0  Export Citation
Onset of Soret convection in a nanoparticles-suspension heated from above
Min Chan Kim†, Lae Hyun Kim1, and Do-Young Yoon2
  • Department of Chemical Engineering, Jeju National University, Jeju 690-756, Korea
  • 1Department of Chemical Engineering, Seoul National University of Technology, Seoul 139-743, Korea
  • 2Department of Chemical Engineering, KwangWoon University, Seoul 139-701, Korea
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The onset of Soret-driven convection in a nanoparticles suspension heated from above is analyzed theoretically based on linear theory and relative instability concept. A new set of stability equations are derived and solved by using the dominant mode method. The dimensionless critical time τc to mark the onset of instability is presented here as a function of the Rayleigh number, the Lewis number and the separation ratio. Available experimental data indicate that for large Rayleigh number convective motion is detected starting from a certain time τ~3 τc. This means that the growth period of initiated instabilities is needed for convective motion to be detected experimentally. It seems evident that during τc≤τ ≤3 τc convective motion is relatively very weak and the primary diffusive transfer is dominant.
Keywords:Soret Convection;Nanoparticles Suspension;Dominant Mode Method
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