Temperature fluctuations and heat transport in partitioned supergravitational thermal turbulence
隔板超重力热湍流中的温度脉动和热输运作者机构：Beijing Key Laboratory of Space Thermal Control TechnologyBeijing Institute of Spacecraft System EngineeringBeijing100094China Center for Combustion EnergyKey Laboratory for Thermal Science and Power Engineering of MoEand Department of Energy and Power EngineeringTsinghua UniversityBeijing100084China Department of Engineering MechanicsSchool ofAerospace EngineeringTsinghua UniversityBeijing100084China
出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)
年 卷 期：2024年第40卷第6期
页 面：20-30页
核心收录：
基 金：supported by the National Natural Science Foundation of China(Grant No.11988102) the New Cornerstone Science Foundation through the XPLORER PRIZE
主 题：Partitioned turbulent convection Supergravity Probability density function Power spectra Heat transfer
摘 要：We report an experimental study of the local temperature fluctuationsδT and heat transport in a partitioned supergravitational turbulent convection *** 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 *** partitioned system,zonal flow is suppressed and the PDFs indicate that the single-plume effect is ***,statistical analysis shows that the PDF ofδT is sensitive to ***,the thermal spectra follow P(f)∼f^(-5) in the normal system,which is relevant to the zonal *** 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 ***,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 *** work may provide insights into the flow and heat transport control of some engineering and geophysical flows.
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