Boundary layer structure in confined turbulent thermal convection
نویسندگان
چکیده
منابع مشابه
Spatial structure of the thermal boundary layer in turbulent convection
We have measured the mean temperature profiles T̄(z) and the thermal layer thickness d th(x ,y) at various horizontal positions on the lower plate of a cylindrical convection cell, using water as the working fluid. The Rayleigh number Ra in the experiment varied from 2310 to 2310. The normalized vertical temperature profiles measured at various positions x along the direction of large scale circ...
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We report a new thermal boundary layer equation for turbulent Rayleigh-Bénard convection for Prandtl number Pr>1 that takes into account the effect of turbulent fluctuations. These fluctuations are neglected in existing equations, which are based on steady-state and laminar assumptions. Using this new equation, we derive analytically the mean temperature profiles in two limits: (a) Pr≳1 and (b)...
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We present Particle Image Velocimetry measurements in the boundary layer in turbulent Rayleigh-Bénard (RB) convection for the Rayleigh number RR = 1.4 × 1010 and the Prandtl number PP = 0.7 . The measurements have been undertaken in a large-scale RB experiment 7.15 m in diameter and 6.30 m in height which is called the “Barrel of Ilmenau”. They give detailed insight into the near-wall flow fiel...
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We present an experimental study of the spatial structure of the velocity field in the boundary layer region of a Rayleigh-Bénard convection cell, using water as the working fluid. Our results show that the mean flow, the shear rate, and the viscous boundary layer thickness all change significantly across the conducting horizontal surface of the cell. Moreover, the measurements reveal that the ...
متن کاملStructure of thermal boundary layers in turbulent RayleighBnard convection
We report high-resolution local-temperature measurements in the upper boundary layer of turbulent Rayleigh–Bénard (RB) convection with variable Rayleigh number Ra and aspect ratio Γ . The primary purpose of the work is to create a comprehensive data set of temperature profiles against which various phenomenological theories and numerical simulations can be tested. We performed two series of mea...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2012
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2012.309