Results 271 to 280 of about 113,224 (304)

A Linear- Eddy Model of Turbulent Scalar Transport and Mixing

Combustion Science and Technology, 1988
Abstract Transport and mixing of diffusive scalars in turbulent flows are simulated computationally based on a novel representation of the temporal evolution along a transverse line moving with the mean fluid velocity. The scalar field along this line evolves by Fickian diffusion, representing molecular processes, and by randomly occurring events ...
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On the relationship between mixing length and strong turbulence estimates for transport due to drift turbulence

Plasma Physics and Controlled Fusion, 2001
For a simple two-dimensional nonlinear model of the collisional drift instability the relationship between mixing length and strong turbulence fluxes investigated. Calculation of the turbulent wavenumber spectrum within a strong turbulence model shows that the transport is dominated by an inertial range contribution; this yields a similar result for ...
J W Connor, O P Pogutse
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A modification of the mixing length approach to turbulent transport

Journal of Applied Physics, 1986
It is known that the usual development of the mixing length approach to the transport of a passive physical quantity in a turbulent fluid is only valid if the proportional change in concentration of the quantity over a mixing length l is small. In the present paper we formulate a modification of the theory which is not subject to this constraint and ...
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Transport of Heat Across a Plane Turbulent Mixing Layer

1975
Publisher Summary A well-known characteristic of turbulent shear flows is that the spread of scalar quantities—that is, heat or matter, is faster than the spread of momentum. This chapter describes a model for the transport mechanism of a scalar quantity in typical turbulent shear flows.
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Dynamics of Conserved Scalar Mixing and Transport in Gas-Phase Turbulent Jets

52nd Aerospace Sciences Meeting, 2014
Using a next generation pulse-burst laser system mixture fraction data of an axisymmetric propane jet issuing into air was collected at 10 kHz. Planar Rayleigh scattering measurements were taken for Red = 10,000; 20,000; 30,000 at axial locations ranging from x/d = 10 40.
Michael Papageorge, Frederik Fuest, Jeffrey A. Sutton   +2 more
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Linear-eddy modeling of turbulent transport. II: Application to shear layer mixing

Combustion and Flame, 1989
Abstract The linear-eddy modeling approach involves the representation of a spatially developing flow by a simulation of the time development along a transverse line moving with the mean flow. Scalar quantities evolve by Fickian (molecular) diffusion and by randomly occurring spatial rearrangements, representing turbulent convection.
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Turbulent transport properties in subsonic coaxial free mixing systems

2nd Fluid and Plasma Dynamics Conference, 1969
D. CHRISS, R. PAULK
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Experimental Studies of Scalar Transport and Mixing in a Turbulent Shear Flow

2015
High resolution, multi-sensor, hot/cold-wire measurements were made in passively heated, uniformly sheared turbulence in a wind-tunnel. Measurements were focused on terms that are important for modelling of the scalar probability density function (PDF) equation.
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Turbulent transport coefficients for compressible heterogeneous mixing

International Journal of Heat and Mass Transfer, 1973
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PDF models for particle transport, mixing and collisions in turbulent gas flows

2016
The Probability Density Function (PDF) approach has proved very useful in studying the behavior of stochastic systems. Examples of its usage occur in the study of Brownian Motion e.g. Chandrasekhar (1943) and in the kinetic theory of gases e.g. Chapman & Cowling (1952).
Reeks, Michael W., Simonin, Olivier, Fede, Pascal   +2 more
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