Acceda
author
Alemán. José V.
author
Sangrá, P.
author
Carbó, rafael
2011-09-07
2011-09-07T04:00:20Z
2009
http://hdl.handle.net/10553/6288
[EN]A comprehensive description of ocean molecular flow and deformation is provided with the help of
hydrodynamic and ultrasonic principles. Hydrodynamic computation of true or natural viscosities shows that ocean shear
viscosity (?G), compression viscosity (?K), and extensional viscosity (?E) are interrelated. There are no experimental
methods available for the in situ measurement of these viscosities. Sound absorption coefficients (? obs) allow to know the
ultrasonic shear (?UG), compression (?UK), and longitudinal (?L) viscosities, which decrease with increasing frequency and
increase with increasing temperature, the flow activation energies having nearly equivalent values; pressure (depth)
increase/decrease them at low/high frequencies. The viscosities ?*
UG, ?*
UK, ?*
L are approached at about 1000 KHz. They
decrease with temperature and pressure, and increase with salinity. The ?*UG becomes equal to the true shear viscosity ? G
at the viscosity ratio ? = ?UK / ?UG = 0.
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Previous issue date: 2009
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The Open Acoustics Journal, ISSN 1874-8376, v. 2, p. 87-94
2510 Oceanografía
Chemical relaxation
ocean rheology
sound absorption
ultrasonic viscosity
viscosity ratio
Ocean Ultrasonic Shear and Compression Viscosities
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