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Kinetic relaxing processes in collective dynamics of pure liquids
The role of nonhydrodynamic relaxing processes in collective dynamics of pure liquids is studied within a generalized collective modes approach. A five-variable model of generalized hydrodynamics is solved analytically in long-wavelength limit. Among five collective modes we found three hydrodynamic...
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Main Authors: | , |
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Format: | Article |
Language: | English |
Published: |
Інститут фізики конденсованих систем НАН України
2004
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Series: | Condensed Matter Physics |
Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/119036 |
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Summary: | The role of nonhydrodynamic relaxing processes in collective dynamics of pure liquids is studied within a generalized collective modes approach. A five-variable model of generalized hydrodynamics is solved analytically in long-wavelength limit. Among five collective modes we found three hydrodynamic and two relaxing kinetic excitations. Two latter ones describe the viscous and heat relaxation in liquid. A comparison of analytical results and molecular dynamics data is performed for a Lennard-Jones fluid and a liquid metal. A crossover from standard hydrodynamics to molecular regime in relaxational behaviour of simple liquids is discussed. |
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