Results 11 to 20 of about 1,327 (186)
Turbulent Prandtl number from isotropically forced turbulence
Journal of Fluid Mechanics, 2022 Turbulent motions enhance the diffusion of large-scale flows and temperature gradients. Such diffusion is often parameterized by coefficients of turbulent viscosity ( $\nu _{t}$ ) and turbulent thermal diffusivity ( $\chi _{t}$ ) that are analogous to their microscopic counterparts.
Petri J. Käpylä, Nishant K. Singh
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Propulsion and Power Research, 2020 This experiment used a parallel array of hot wire probes to simultaneously measure the temperature and velocity fields in the non-isothermal turbulent boundary layer of a rotating straight channel. The Reynolds numbers are 15,000 and 25,000, respectively.
Ran Gao +4 more
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Turbulent Transport in a Stratified Shear Flow
Journal of Marine Science and Engineering, 2023 Within the framework of the theory of unsteady turbulent flows in a stratified fluid, a new parameterization of the turbulent Prandtl number is proposed.
Daria Gladskikh +4 more
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Numerical Investigation of Turbulent Heat Transfer Properties at Low Prandtl Number
Frontiers in Energy Research, 2020 The sodium-cooled fast reactor (SFR), which is one of the most promising candidates for meeting the goal declared by the Generation IV International Forum (GIF), has drawn a lot of attention.
Xiang Chai +3 more
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On the turbulent Prandtl number in homogeneous stably stratified turbulence [PDF]
Journal of Fluid Mechanics, 2010 In this paper, we derive a general relationship for the turbulent Prandtl number Prt for homogeneous stably stratified turbulence from the turbulent kinetic energy and scalar variance equations. A formulation for the turbulent Prandtl number, Prt, is developed in terms of a mixing length scale LM and an overturning length scale LE, the ratio of the ...
Venayagamoorthy, Subhas K. +1 more
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The anisotropy of low prandtl number turbulent convection [PDF]
Geophysical & Astrophysical Fluid Dynamics, 1992 A model for homogeneous anisotropic incompressible turbulence is proposed. The model generalizes the GISS model of homogeneous isotropic turbulence; the generalization involves the solution of the GISS equations along a set of integration paths in wavenumber (k-) space.
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Frontiers in Energy Research, 2022 In the simple gradient diffusion hypothesis, the turbulent Prandtl number (Prt) with a constant of 0.85 is difficult to accurately predict for liquid metals having low Prandtl numbers (Pr), while a four-equation model can improve this solution by ...
Xingkang Su +12 more
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Estimating turbulent energy flux vertical profiles from uncrewed aircraft system measurements: exemplary results for the MOSAiC campaign [PDF]
Atmospheric Measurement Techniques, 2023 This study analyzes turbulent energy fluxes in the Arctic atmospheric boundary layer (ABL) using measurements with a small uncrewed aircraft system (sUAS).
U. Egerer +21 more
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Impact of Prandtl numbers on turbulence modeling
Journal of Physics: Conference Series, 2019 Abstract A low-Reynolds number (LRN) k - ε ˜
Md Mizanur Rahman, Ming LV, Zefei Zhu
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Rayleigh and Prandtl number scaling in the bulk of Rayleigh–Bénard turbulence [PDF]
Physics of Fluids, 2005 The Ra and Pr number scaling of the Nusselt number Nu, the Reynolds number Re, the temperature fluctuations, and the kinetic and thermal dissipation rates is studied for (numerical) homogeneous Rayleigh–Bénard turbulence, i.e., Rayleigh–Bénard turbulence with periodic boundary conditions in all directions and a volume forcing of the temperature field ...
Calzavarini E. +3 more
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