dissipation

1 breaking up and scattering by dispersion; "the dissipation of the mist"

2 dissolute indulgence in sensual pleasure [syn: profligacy, dissolution, licentiousness]

3 useless or profitless activity; using or expending or consuming thoughtlessly or carelessly; "if the effort brings no compensating gain it is a waste"; "mindless dissipation of natural resources" [syn: waste, wastefulness]

English

Pronunciation

• /ˌdɪsəˈpeɪʃən/
• /%dIs@"peIS@n/
• Rhymes: -eɪʃǝn

Noun

1. The act of dissipating or dispersing; a state of dispersion or separation; dispersion; waste.
2. A dissolute course of life, in which health, money, etc., are squandered in pursuit of pleasure; profuseness in vicious indulgence, as late hours, riotous living, etc.; dissoluteness.
3. A trifle which wastes time or distracts attention.
4. A loss of energy as heat from a dynamic system

Translations

• Croatian: disipacija
• Greek: διάχυση, διασπορά

In physics, dissipation embodies the concept of a dynamical system where important mechanical modes, such as waves or oscillations, lose energy over time, typically due to the action of friction or turbulence. The lost energy is converted into heat, raising the temperature of the system. Such systems are called dissipative systems.

For example, a wave that loses amplitude is said to dissipate. The precise nature of the effects depends on the nature of the wave: an atmospheric wave, for instance, may dissipate close to the surface due to friction with the land mass, and at higher levels due to radiative cooling.

Dissipating forces are those which can not be described by Hamiltonian formalism. Loosely speaking, friction and all similar forces which result in decoherency of energy, that is, conversion of coherent or directed energy flow into an indirected or more isotropic distribution of energy.

In computational physics, a numerical dissipation is also known as "artificial dissipation" or "artificial diffusion" or "numerical diffusion". They all mean this: when the pure advection equation--which, by definition, is free of dissipation--is solved by a numerical approximation method that reduces the amplitude and changes the shape of the initial wave in a way analogous to a diffusional process, the method is said to contain 'dissipation'.

A formal, mathematical definition of dissipation, as commonly used in the mathematical study of measure-preserving dynamical systems, is given in the article wandering set.

In river hydrology

Dissipation is the process of converting mechanical energy of downward flowing water into thermal and acoustical energy. Various devices are designed in streambeds to reduce the kinetic energy of flowing waters to reduce their erosive potential on banks and river bottoms. Very often these devices look like small waterfalls or cascades, where water flows vertically or over riprap to lose some of its kinetic force.

See also

• Flood control
• Two dimensional gas

References

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