scholarly journals Turbulent Environment: Introduction

10.5334/bbk.a ◽  
2019 ◽  
pp. 3-4
Author(s):  
Rodica Milena Zaharia
Keyword(s):  
Turbulent Environment

Turbulent buoyant convection from a source in a confined region

1969 ◽  
Vol 37 (1) ◽  
pp. 51-80 ◽  
Author(s):  
W. D. Baines ◽  
J. S. Turner
Keyword(s):  
Point Source ◽  
Cross Section ◽  
Laboratory Experiments ◽  
Region Of Interest ◽  
Constant Cross Section ◽  
General Shape ◽  
Turbulent Environment ◽  
Starting Conditions ◽  
Upward Velocity ◽  
Local Mean

This paper considers the effect of continuous convection from small sources of buoyancy on the properties of the environment when the region of interest is bounded. The main assumptions are that the entrainment into the turbulent buoyant region is at a rate proportional to the local mean upward velocity, and that the buoyant elements spread out at the top of the region and become part of the non-turbulent environment at that level. Asymptotic solutions, valid at large times, are obtained for the cases of plumes from point and line sources and also periodically released thermals. These all have the properties that the environment is stably stratified, with the density profile fixed in shape, changing at a uniform rate in time at all levels, and everywhere descending (with ascending buoyant elements).The analysis is carried out in detail for the point source in an environment of constant cross-section. Laboratory experiments have been conducted for this case, and these verify the major predictions of the theory. It is then shown how the method can be extended to include more realistic starting conditions for the convection, and a general shape of bounded environment. Finally, the model is applied quantitatively to a variety of problems in engineering, the atmosphere and the ocean, and the limitations on its use are discussed.

scholarly journals Stretching of polymers in a turbulent environment

2002 ◽  
Vol 147 (1-2) ◽  
pp. 538-543 ◽  
Author(s):  
Bruno Eckhardt ◽  
Jochen Kronjäger ◽  
Jörg Schumacher
Keyword(s):  
Turbulent Environment

Testing resistance modulation formats for FSO communication in turbulent environment, with used simulation box

2015 ◽  
Author(s):  
Ales Vanderka ◽  
Lukas Hajek ◽  
Jan Latal ◽  
Jan Vitasek ◽  
Stanislav Hejduk ◽  
...  
Keyword(s):  
Modulation Formats ◽  
Turbulent Environment ◽  
Testing Resistance ◽  
Resistance Modulation

scholarly journals Organic / Inorganic Brand Growth: the Two Faces of Expansion (Case Study of Indian Multinational Videocon Group)

2009 ◽  
Vol 8 (1) ◽  
pp. 20-29
Author(s):  
Ravi Bhasin
Keyword(s):  
Turbulent Environment

The terms organic and inorganic looks very simple as of organic and inorganic food that we consume in our diet, but when we transform our growth in terms of our business these two terms becomes very vast and multidisciplinary. The turbulent environment and slowdown of the economy in the recent times makes organic and inorganic growth more conceptual and complex than before.

scholarly journals Buoyant Motion in a Turbulent Environment

1953 ◽  
Vol 6 (3) ◽  
pp. 279 ◽  
Author(s):  
CHB Priestley
Keyword(s):  
Vertical Velocity ◽  
Initial Conditions ◽  
Simultaneous Equations ◽  
Lapse Rate ◽  
Turbulent Environment ◽  
Continuous Mixing ◽  
Ascent Rate ◽  
Damped Oscillations ◽  
Equilibrium Level ◽  
Lapse Rates

Solutions are given of the simultaneous equations for the vertical velocity and temperature of an element of fluid moving under buoyancy and subject to continuous mixing of heat and momentum with its environment. Three distinct modes of behaviour result: (A) ascent followed by damped oscillations, (B) asymptotic ascent to an equilibrium level, (C) absolute buoyancy in which the ascent rate increases indefinitely. For an environment in which the lapse rate is subadiabatic the motion is of type A for sufficiently large elements but may become B for the smaller elements; in super-adiabatic lapse rates the mode is C for sufficiently large elements, and B for the smaller elements, which are in no way unstable. The mode of motion is independent of the initial conditions but the scale of the motion is not.

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