Semi-empirical Theory of Mineral and Radioisotopic Exchange of Living and Inert Matter in the Marine Environment

2021 ◽  
pp. 57-161
Author(s):  
Victor Egorov
Keyword(s):  
Marine Environment ◽  
Empirical Theory ◽  
Semi Empirical

Numerical Study on Air-Reed Instruments With LES

2011 ◽  
Author(s):  
Kin’ya Takahashi ◽  
Masataka Miyamoto ◽  
Yasunori Ito ◽  
Toshiya Takami ◽  
Taizo Kobayashi ◽  
...  
Keyword(s):  
Numerical Study ◽  
Sound Field ◽  
Acoustic Analogy ◽  
Empirical Theory ◽  
Sound Sources ◽  
Aerodynamic Sound ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Semi Empirical ◽  
2D And 3D

The acoustic mechanisms of 2D and 3D edge tones and a 2D small air-reed instrument have been studied numerically with compressible Large Eddy Simulation (LES). Sound frequencies of the 2D and 3D edge tones obtained numerically change with the jet velocity well following Brown’s semi-empirical equation, while that of the 2D air-reed instrument behaves in a different manner and obeys the semi-empirical theory, so called Cremer-Ising-Coltman theory. We have also calculated aerodynamic sound sources for the 2D edge tone and the 2D air-reed instrument relying on Ligthhill’s acoustic analogy and have discussed similarities and differences between them. The sound source of the air-reed instrument is more localized around the open mouth compared with that of the edge tone due to the effect of the strong sound field excited in the resonator.

scholarly journals Modeling of Deposition of Solid Particles at Cleaning of Oil in Gravitational Separator

2020 ◽  
Vol 126 (1) ◽  
pp. 8-10
Author(s):  
А. А. Gasanov ◽  
◽  
N. Kh. Gamzaeva ◽  
Keyword(s):  
Particle Deposition ◽  
Stationary Process ◽  
Viscous Friction ◽  
Added Mass ◽  
Solid Particles ◽  
Mass Force ◽  
Empirical Theory ◽  
Friction Forces ◽  
Proposed Model ◽  
Semi Empirical

The non-stationary process of sedimentation of a solid spherical particle in a fluid at rest in a gravitational separator is considered. To describe this process, we propose a mathematical model that takes into account viscous friction forces, which is determined on the basis of the Prandtl semi-empirical theory of turbulence, Basse hereditary force, as well as the added mass force. To implement the proposed model, a difference method is used. Using a numerical experiment, the effects of various forces on the particle deposition rate are investigated.

Axisymmetric laminar wake behind a slender body of revolution

1976 ◽  
Vol 76 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Francis R. Hama ◽  
Leigh F. Peterson
Keyword(s):  
Experimental Information ◽  
The Body ◽  
Body Of Revolution ◽  
Empirical Theory ◽  
Mean Velocity ◽  
Laminar Wake ◽  
Flow Field Characteristics ◽  
The Mean ◽  
Semi Empirical ◽  
Slender Body Of Revolution

At the body-diameter Reynolds number 2000, the axisymmetric wake behind a slender streamlined body of revolution remained laminar without any indication of breakup far beyond the five-body-lengths test section. The mean-velocity profiles were measured with close spacings in order to obtain experimental information on the transient process from boundary layer to fully developed wake. A semi-empirical theory was developed to describe the flow-field characteristics.

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