Temperature fluctuations and heat transport in partitioned supergravitational thermal turbulence
王东璞 1刘婧 2赖茹诗 2孙超3
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作者信息
1. Beijing Key Laboratory of Space Thermal Control Technology,Beijing Institute of Spacecraft System Engineering,Beijing 100094,China;Center for Combustion Energy,Key Laboratory for Thermal Science and Power Engineering of MoE,and Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China
2. Center for Combustion Energy,Key Laboratory for Thermal Science and Power Engineering of MoE,and Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China
3. Center for Combustion Energy,Key Laboratory for Thermal Science and Power Engineering of MoE,and Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Department of Engineering Mechanics,School of Aerospace Engineering,Tsinghua University,Beijing 100084,China
We report an experimental study of the local temperature fluctuations δT and heat transport in a partitioned supergravitational tur-bulent convection system.Due to the dynamics of zonal flow in the normal system without partition walls,the probability density function(PDF)at a position in the mixing zone exhibits a downward bending shape,suggesting that the multi-plume clustering effect plays an important role.In partitioned system,zonal flow is suppressed and the PDFs indicate that the single-plume effect is dominant.Moreover,statistical analysis shows that the PDF of δT is sensitive to supergravity.Additionally,the thermal spectra follow P(f)～f-5 in the normal system,which is relevant to the zonal flow.The absolute value of the scaling exponent of P(f)and the scaling range become small in the partitioned system,which provides another evidence for the influence of zonal flow on the energy cascade.Further,heat transfer enhancement is found in the partitioned system,which may result from zonal flow being restricted and then facilitating the radial movement of thermal plumes to the opposite conducting cylinder.This work may provide insights into the flow and heat transport control of some engineering and geophysical flows.
关键词
Partitioned turbulent convection/Supergravity/Probability density function/Power spectra/Heat transfer
Key words
Partitioned turbulent convection/Supergravity/Probability density function/Power spectra/Heat transfer
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基金项目
National Natural Science Foundation of China(11988102)
New Cornerstone Science Foundation through the XPLORER PRIZE()
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