We see that PAMH25 drastically affects the propagation properties and the structure of the vortex ring, while PEO400 shows a behaviour similar to water. We conclude that PAMH25 retards the roll-up process of the
Compressible vortex rings (CVRs) are one fundamental supersonic flow structure, which is usually generated by a compressible starting jet from a nozzle. Changes in the nozzle geometry provide efficient passive flow control to modulate the structures of CVRs. In this paper, a shock-tube apparatus ...
The formation of a vortex ring was simulated by injecting a quantity of a fluid through a tube centrally located near the free surface. Initially, the fluid in the tank was stably thermally stratified, with a low density in the upper half and higher density in the lower half. Buoyancy ...
The propeller propulsion system has traditionally been used in most UUV designs because of its stability and convenience for operation. Such designs have a characteristic that can generate constant thrust, so they can be used in environments where there is no space constraint or continuous work is ...
Based on the impulse law, it is speculated that the fluid force generated by the formation of the rear vortex rings can be enhanced. Therefore, the strong interaction between wake vortices can actually improve the propulsive efficiency of the biological systems by operating the formation of large-...
et al. Bosonic helium droplets with cationic impurities: onset of electrostriction and snowball effects from quantum calculations. J. Chem. Phys. 126, 124319 (2007). Article ADS CAS PubMed Google Scholar Issaoui, N. et al. Theoretical investigation of the relative stability of Na+Hen (n =...
In particular, the local structure index13 and the r5 parameter14—two order parameters that effectively measure the distance between the first and second coordination shells—have been routinely applied. However, along the years, it has become increasingly apparent that a proper description of the ...
A method and apparatus is disclosed for controlled mixing or agitation of fluids and slurries using the generation and propagation of vortex rings. The vortex rings are generated from a generator plate. The novelties are a central drive shaft which moderates the behavior of the vortex rings, the...
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M. A. Brutyan and P. L. Krapivskii, “The motion of a system of vortex rings in an incompressible fluid ,” J. Appl. Math. Mech. , 48, 365–368 (1984). MathSciNet View ArticleM. A. Brutyan and P. L. Krapivskii, “Motion of a system of vortex rings in an incompressible,...