PMID: 11308941Apr 20, 2001Paper

Temperature fluctuations in a convection cell with rough upper and lower surfaces

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Y B Du, P Tong

Abstract

A turbulent convection experiment is conducted in a cell with rough upper and lower surfaces. Temperature statistics, frequency power spectrum, and thermal dissipation are measured over varying Rayleigh numbers in the central region of the cell. The temperature histogram in the rough cell is found to have the same exponential shape as that in the smooth cell, but the width of the distribution is increased by approximately 25%. The measured power spectrum shows that temperature fluctuations in the rough cell are increased uniformly across the whole frequency range. The cutoff frequency f(c) of the power spectrum and the time averaged square temperature time derivative <( partial differentialT/ partial differentialt)(2)> are used to characterize the thermal dissipation in turbulent convection. It is found that the normalized f(c) as well as <( partial differentialT/ partial differentialt)(2)> in the smooth and rough cells with different aspect ratios can all be superposed onto a single curve, indicating that the thermal dissipation in these cells is determined by the same mechanism. The experiment suggests that the enhanced heat transport observed in the rough cell is determined primarily by the local dynamics near the upper and ...Continue Reading

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Citations

Apr 28, 2009·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Xiaozhou He, Penger Tong
Oct 4, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Kenichiro ChoToshiyuki Toriyama
Jun 13, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A Namiki, K Kurita
Nov 22, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Z A Daya, R E Ecke
Sep 28, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·X-D ShangK-Q Xia
Aug 27, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Yuanming Liu, Robert E Ecke
Apr 27, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Xiaozhou He, Penger Tong
Jul 23, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Quan Zhou, Ke-Qing Xia
Jul 23, 2008·Physical Review Letters·Xiao-Dong ShangKe-Qing Xia
Oct 4, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Thomas H van den BergDaniel P Lathrop
Oct 3, 2001·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·X L Qiu, P Tong
Sep 26, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Ping WeiKe-Qing Xia

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