Results 221 to 230 of about 15,562 (263)

Transport Phenomena in Turbulent Flows

2015
In this chapter we intend to provide a brief introduction to the study of transport phenomena in the presence of turbulent flows. This is a very large and quite specialized topic, and here we will confine our treatment to some basic features, above all in the context of pipe flow, referring the interested readers to more specialized texts (See, for ...
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Aspects of Turbulent Transport

Contributions to Plasma Physics, 2004
AbstractTurbulence is an ubiquitous phenomenon in plasmas, which usually have large amounts of free energy available to drive turbulent velocity fluctuations. A universal property of turbulence is its abilities to mix and to transport quantities. We discuss the relationship between passive particle transport due to turbulence and the turbulent plasma ...
V. Naulin, J. J. Rasmussen
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A theory of turbulent transport

Journal of Fluid Mechanics, 1989
A calculation is made of the turbulent transport terms (third moments) that occur in the Reynolds stress equation for buoyant and/or sheared fluids. This calculation is based on neglect of a two-time fourth-order cumulant – a weaker approximation than neglect of the usual single-time fourth-order cumulant.
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Wind and Turbulent Transport

2016
The flow of wind over crop canopies causes a transfer of momentum from the air to the canopy that generates turbulence which enhances the exchange of matter and energy between the atmosphere and crops. Turbulence increases with wind velocity and aerodynamic roughness which is proportional to crop height.
Francisco J. Villalobos, Elias Fereres, Luca Testi   +2 more
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Transport Phenomena in Rotating Turbulence

2017
The role of rotation on turbulence and some of its transport properties will be reviewed with emphasis on two specific cases: statistically steady or decaying rotating turbulence and rotating thermally driven turbulence. For this purpose we briefly address a few basic concepts relevant for understanding processes in rotating (turbulent) flows such as ...
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Turbulence, Transport and Reconnection

2019
Turbulence is a multi-scale phenomenon that is ubiquitous in our universe. Strong nonlinearity in a system enhances coupling among modes, leading to a very broad spectrum in the spatial domain which contains an energy cascade and dissipation. We have to deal with all the scales of motions from the largest energy-containing scale to the smallest ...
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Turbulent transport in flames

Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences, 1995
Abstract A review is presented of turbulent transport phenomena in flames. Both large-scale turbulent transport and small-scale mixing processes are considered and various mechanisms of interaction between combustion and turbulent flow are identified. Flame-surface density descriptions of turbulent combustion at high Damköhler numbers
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Turbulence Transport

2022
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Plasma Transport by Turbulence

2016
Particle diffusion coefficient due to drift fluctuation is given by (13.12) \(D = (\varDelta x)^2\gamma _k = (\varDelta x)^2/\tau _c =\gamma _k /k^2_x\) in Sect. 13.1. The more accurate radial width \(\varDelta x\) of eigenmode of ion temperature gradient driven drift turbulence depends on the shear.
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Renormalization group method for the turbulent mass transport two-equation model

Chemical Engineering Science, 2022
Shengkun Jia, Xuepu Cao, Kuo-Tsong Yu
exaly