Turbulent transfer in the lower atmosphere.
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Turbulent transfer in the lower atmosphere.

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Published by University of Chicago Press in [Chicago] .
Written in English

Subjects:

  • Atmospheric turbulence.,
  • Thermodynamics.

Book details:

Classifications
LC ClassificationsQC880 .P73
The Physical Object
Pagination130 p.
Number of Pages130
ID Numbers
Open LibraryOL6272883M
LC Control Number59010427

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Get this from a library! An investigation of turbulent transport in the extreme lower atmosphere. [Chester A Koper; Willy Z Sadeh; Colorado State University. Fluid Dynamics and Diffusion Laboratory.]. Atmospheric turbulence near the Earth’s surface differs from that at higher levels. At low levels (within a few hundred metres of the surface), turbulence has a marked diurnal variation under partly cloudy and sunny skies, reaching a maximum about midday. This occurs because, when solar radiation heats the surface, the air above it becomes warmer and more buoyant, and cooler, denser air. This book provides an up-to-date and rigorous introduction to turbulence in the atmosphere and in engineering flows for advanced students, and a reference work for researchers in the atmospheric sciences. With student exercises at the end of each chapter and worked solutions online, this is an invaluable resource for any related by: Turbulent Diffusion. Turbulent diffusion is the dominant transfer process in the free atmosphere, although molecular diffusion continues to operate and is responsible for the ultimate degradation of turbulent energy into heat. From: Principles of Environmental Physics (Fourth Edition), Related terms: pH; Turbulence; Molecular Diffusion.

The objective of this study was to investigate the turbulent transfer mechanism near the surface. ‘Direct’ measurements of the turbulent fluxes of momentum, heat, and moisture were made in the atmospheric surface layer 2 m above a grass surface at Ladner, Canada. The mixing‐length theory of turbulent thermal convection in a gravitationally unstable fluid is extended to yield the dependence of Nusselt number H/H0 on both Prandtl number σ and Rayleigh number Ra. The analysis assumes a layer of Boussinesq fluid contained between infinite, horizontal, perfectly conducting, rigid plates. Also obtained is the dependence of mean temperature deviation T̄(z Cited by:   Interaction between sensible heat and water vapor diffusion in the lower atmosphere leads to the necessity of solving two simultaneous turbulent diffusion equations. This solution is obtained by the construction of Green's function which when incorporated in the boundary conditions produces two integral equations. These are solved by transformation into two algebraic equations by means of the Cited by: Answer: Heat Transfer rate is better in a Turbulent Flow. (If you want to understand why, then delve further into the answer) Reason: Laminar and Turbulent Flow regimes in cigarette smoke The flow regime near the cigarette butt is said to be Lamin.

This is because turbulent exchange of fluid masses acts on a much larger scale than the molecular motions involved in the viscous shear stress and therefore transports momentum much more efficiently. Figure \(\PageIndex{4}\) is a plot of the distribution of turbulent shear stress and viscous shear stress in steady uniform flow down a plane. Turbulent Transport Near the Ground in Stable Conditions. The relationships suggest that the decay of turbulent motion in the lower atmosphere begins at Ri=, and completely ceases at Ri> The transition from laminar to turbulent flow takes place at Reynolds numbers in the range , Flows in the atmosphere are generally turbulent because the relevant values of U and L are large. This turbulence is evident when one observes the dispersion of a combustion plume emanating from a cigarette, a barbecue, or a smokestack. Turbulent fluxes are an essential part of any ocean–atmosphere model. For example, the turbulent transport of water vapor from the surface to the atmosphere is equal to the global precipitation. Equations of turbulent fluxes can be formulated if higher order subgrid transport terms are known.