Results 151 to 160 of about 1,327 (186)

Turbulent Prandtl number and spectral characteristics of a turbulent mixing layer

International Journal of Heat and Mass Transfer, 1985
Abstract Measurements have been made of all three velocity fluctuations and of the temperature fluctuations in a thermal mixing layer associated with a turbulent plane jet. In a region of the flow for which the Reynolds stresses and heat fluxes are large, the turbulent Prandtl number is equal to about 0.4. The small magnitude of the turbulent Prandtl
A.J. Chambers, R.A. Antonia, L. Fulachier   +2 more
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The turbulent Prandtl number in the near-wall region for low-Prandtl-number gas mixtures

International Journal of Heat and Mass Transfer, 1996
Results of experiments for binary gas mixtures, with molecular Prandtl numbers in the range 0.18–0.7 in flow in a smooth circular tube with constant transport properties were employed to examine models hypothesized for the distribution of the turbulent Prandtl number, Prt,{{y+, Pr, Re}}.
D.M. McEligot, M.F. Taylor
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Modeling of turbulent Prandtl number in stationary and homogeneous stratified turbulence

OCEANS'10 IEEE SYDNEY, 2010
The dependency of turbulent Prandtl number on the stratification stability was numerically investigated by means of direct numerical simulation of homogeneous and stratified turbulence in which the gradient Richardson number ranged from 0.05 to 0.15.
S. Hirabayashi, T. Sato
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Turbulente Prandtl-Zahl Prt (turbulent Prandtl number Prt)

2000
Es handelt sich urn eine Stromungsgrose (keine Stoffgrose), die in Analogie zur molekularen Prandtl-Zahl (einer Stoffgrose) eingefuhrt worden ist. Sie ist keine dimensionslose Kennzahl im Sinne der Dimensionsanalysis.
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On the variation of the turbulent prandtl number in shear flows

International Communications in Heat and Mass Transfer, 1984
Abstract Although the rapid distortion formulation proposed by Townsend (1976) qualitatively describes the variation in the turbulent Prandtl number Pr t among different shear flows, direct measurements of Pr t indicate that the experimental variation of Pr t is underestimated by his formulation.
K.R. Sreenivasan, R.A. Antonia, A.J. Chambers   +2 more
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The prediction of turbulent Prandtl and Schmidt numbers

International Journal of Heat and Mass Transfer, 1975
Abstract This paper examines more than thirty ways of predicting the relationship between turbulent transfers of momentum and a passive contaminant such as heat or dissolved matter. The models are divided into seven classes, on the basis of method of derivation or field of application.
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Effect of the Prandtl number on a stratified turbulent wake

Physics of Fluids, 2010
Direct numerical simulation is employed to study the effect of the Prandtl number, Pr=ν/α with ν the molecular viscosity and α the molecular diffusivity, on a turbulent wake in a stratified fluid. Simulations were conducted at a Reynolds number of 10 000, Re=UD/ν with U the velocity of the body and D the diameter of the body, for a range of Prandtl ...
de Stadler, Matthew B., Sarkar, Sutanu, Brucker, Kyle A.   +2 more
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Thermal turbulence at very small Prandtl number

Journal of Geophysical Research, 1962
The equations of thermal turbulence are derived for the case of small Prandtl number, a case of a relatively simple realizable turbulent flow. The power spectrum of velocity is described using the transfer functions of Heisenberg and of Kovasznay. It is seen that these do not give uniformly good approximations, since they force spectral energy to flow ...
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A Model for Eddy Conductivity and Turbulent Prandtl Number

Journal of Heat Transfer, 1973
This paper presents a model for eddy conductivity and turbulent Prandtl number based on the considerations of a Stokes-type flow. The expressions obtained by the model provide continuous velocity and temperature distributions for turbulent flows and are applicable to flows with pressure gradients, mass transfer, and heat transfer. Close to the wall the
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Patterns of convective turbulence: an effect of Prandtl number

Physics of the Earth and Planetary Interiors, 1995
Abstract Direct numerical modeling is used to study the influence of Prandtl number (Pr) on the style of high Rayleigh number thermal convection. The spline-characteristic method, an algorithm for direct numerical simulation of turbulent flows, is employed to simulate 3-D convection in the Boussinesq limit.
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