Author: Edmond M. Dewan
Publisher:
ISBN:
Category : Computer simulation
Languages : en
Pages : 54
Book Description
A self-consistent method of characterizing vertical turbulent transport by means of a diffusion parameter is demonstrated for the extremely inhomogeneous case of layered turbulence in a stratified fluid. Between the horizontal turbulent layers, horizontal laminar flow is assumed to occur, and molecular diffusion is ignored. The layers are assumed to occur at random heights with random thickness. An analogy is made between the process of random mixing layers and the finite difference representation of the diffusion equation. It is demonstrated by means of a series of digital computer experiments that, in the case where total mixing takes place within the turbulent layers, the diffusion parameter herein developed is the valid one to use (in contrast to 'eddy diffusivity'). The relation between this inhomogeneous diffusion parameter and practical experimental measurements is given. The motive behind this investigation involves vertical transport of pollution in the environment in general and in the stratosphere in particular.
A One-dimensional Vertical Diffusion Parameter for Extremely Inhomogeneous, Layered Turbulence in Stratified Fluids
Author: Edmond M. Dewan
Publisher:
ISBN:
Category : Computer simulation
Languages : en
Pages : 54
Book Description
A self-consistent method of characterizing vertical turbulent transport by means of a diffusion parameter is demonstrated for the extremely inhomogeneous case of layered turbulence in a stratified fluid. Between the horizontal turbulent layers, horizontal laminar flow is assumed to occur, and molecular diffusion is ignored. The layers are assumed to occur at random heights with random thickness. An analogy is made between the process of random mixing layers and the finite difference representation of the diffusion equation. It is demonstrated by means of a series of digital computer experiments that, in the case where total mixing takes place within the turbulent layers, the diffusion parameter herein developed is the valid one to use (in contrast to 'eddy diffusivity'). The relation between this inhomogeneous diffusion parameter and practical experimental measurements is given. The motive behind this investigation involves vertical transport of pollution in the environment in general and in the stratosphere in particular.
Publisher:
ISBN:
Category : Computer simulation
Languages : en
Pages : 54
Book Description
A self-consistent method of characterizing vertical turbulent transport by means of a diffusion parameter is demonstrated for the extremely inhomogeneous case of layered turbulence in a stratified fluid. Between the horizontal turbulent layers, horizontal laminar flow is assumed to occur, and molecular diffusion is ignored. The layers are assumed to occur at random heights with random thickness. An analogy is made between the process of random mixing layers and the finite difference representation of the diffusion equation. It is demonstrated by means of a series of digital computer experiments that, in the case where total mixing takes place within the turbulent layers, the diffusion parameter herein developed is the valid one to use (in contrast to 'eddy diffusivity'). The relation between this inhomogeneous diffusion parameter and practical experimental measurements is given. The motive behind this investigation involves vertical transport of pollution in the environment in general and in the stratosphere in particular.
A One-dimensional Vertical Diffusion Parameter for Extremely Inhomogeneous, Layered Turbulence in Stratified Fluids
Author: Edmond M. Dewan
Publisher:
ISBN:
Category : Stratosphere
Languages : en
Pages : 51
Book Description
Publisher:
ISBN:
Category : Stratosphere
Languages : en
Pages : 51
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1124
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1124
Book Description
R & D Abstracts
Author: Technology Reports Centre (Great Britain)
Publisher:
ISBN:
Category :
Languages : en
Pages : 924
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 924
Book Description
Vertical Transport by Small Scale Stratospheric Turbulence
Author: Edmond M. Dewan
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 36
Book Description
This paper reviews the estimates to date of the vertical 'effective diffusion coefficient' for stratospheric small scale turbulence transport, KB. These estimates range (in order of magnitude) from 1.0 sq. meter/s to 0.01 sq. meter/s, that is to say from a value which would make turbulence a dominant factor in stratospheric transport to a value which would make it totally insignificant. Such a large range implies much ignorance in this subject. The various techniques are closely examined and the unanswered experimental questions are exhibited. The conclusion is reached that more experimental work needs to be done before one has a reliable estimate for KB.
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 36
Book Description
This paper reviews the estimates to date of the vertical 'effective diffusion coefficient' for stratospheric small scale turbulence transport, KB. These estimates range (in order of magnitude) from 1.0 sq. meter/s to 0.01 sq. meter/s, that is to say from a value which would make turbulence a dominant factor in stratospheric transport to a value which would make it totally insignificant. Such a large range implies much ignorance in this subject. The various techniques are closely examined and the unanswered experimental questions are exhibited. The conclusion is reached that more experimental work needs to be done before one has a reliable estimate for KB.
Environmental Research Papers
Author:
Publisher:
ISBN:
Category : Environmental geology
Languages : en
Pages : 402
Book Description
Publisher:
ISBN:
Category : Environmental geology
Languages : en
Pages : 402
Book Description
Government Reports Announcements & Index
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 298
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 298
Book Description
Turbulence and Diffusion in Stable Environments
Author: Julian C. R. Hunt
Publisher: Oxford University Press, USA
ISBN:
Category : Science
Languages : en
Pages : 344
Book Description
Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Publisher: Oxford University Press, USA
ISBN:
Category : Science
Languages : en
Pages : 344
Book Description
Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Meteorological and Geoastrophysical Abstracts
Author:
Publisher:
ISBN:
Category : Cosmic physics
Languages : en
Pages : 1382
Book Description
Publisher:
ISBN:
Category : Cosmic physics
Languages : en
Pages : 1382
Book Description
Environmental Pollution & Control
Author:
Publisher:
ISBN:
Category : Pollution
Languages : en
Pages : 656
Book Description
Publisher:
ISBN:
Category : Pollution
Languages : en
Pages : 656
Book Description