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Principle of operation the new generation air-jet spinners were presented. Based on Murata Jet Spinner (MJS), MTS (Murata Twin Spinner) and MVS (Murata Vortex Spinner) offered by Japanese company MURATA and air-jet JW and J20 spinners offered by Swiss company RIETER. The principle of yam formation in double helix vortex was discussed, as well as pneumatic spinning using the principle of false twisting. In the classic two-jet pneumatic spinning air jets MJS air-jetthe principle of false twist was used. Element which impart the yarn twist in the pneumatic one-jet MVS spinning is a specially formed air jet having inside a hollow channel and additional air intakes to allow for a helical vortex. The most innovative air-jet pneumatic spinner is the MVS VORTEX III 870 working on the so-called „self-spinning" technology.
Hydrodynamic flow regulators are used for diversion and/or limiting excess discharge in wastewater and stormwater systems as a replacement for traditional flow throttling devices. They are highly efficient, reliable and free from common disadvantages of traditional devices. Recent research of the authors indicated that atomization of a liquid by vortex flow regulators accelerates oxygenation and prevents the putrefaction process in wastewater and storm water collection systems. The study presents experimental results of the oxygen transfer measurements for basic designs of cylindrical hydrodynamic flow regulators in a closed-circuit experimental setup at the semi-commercial scale. The oxygen mass transfer coefficient, standard oxygen transfer rate and standard aeration efficiency were determined for the range of tested configurations by the clean water test.
Content available remote Influence of vortices on a progressive quasi-plane acoustic wave
The projecting of the quasi-plane flow into specific modes yields in a set of coupled equations accounting for all possible interactions of the basic types of motion. A particular case of interaction considers vortices affecting the character of sound propagation. The new dynamic equations describing the propagation of a progressive acoustic beam interacting with a vortex background are derived and discussed. Since two acoustic branches become separated, these equations include the first order derivative with respect to time. It is the main result of the present paper. Illustrations on the scattered acoustic pressure referring to the different types of vortex flow are presented.
The paper describes the problem of discrete formulation of plane fluid flows in material description. The investigation is confined to chosen cases of stationary potential and vortex motion of an incompressible inviscid fluid within circular domains with perfect boundaries. The paths of fluid particles are obtained by numerical integration of momentum equations within a discrete time space. Brownian type random disturbances are attached to the displacement field obtained by the integration. It has been shown, that the discrete formulation may lead to solutions in which a small distance between two material points may grow to a relatively large value after a finite elapse of time. The last feature of the procedure may be a serious drawback of the discrete formulation in the material variables.
Content available remote On the viscoelastic core of a line vortex embedded in a stagnation point flow
The viscoelastic core of a line vortex embedded in a radially inward axisymmetric stagnation point flow for a Maxwell fluid and an Oldroyd B fluid is considered. Velocity, vorticity and stress distributions are calculated and compared with those of the Newtonian fluid. It is found that there are pronounced effects of viscoelastic properties on these distributions with respect to those of the Newtonian fluid.
Przedmiotem pracy jest analiza skuteczności wydzielania cząstek aerozolowych w odpylaczach mokrych, działających w oparciu o zjawisko zderzania strug cieczy. Zderzające się strumienie generują osiowosymetryczny strumień kropel, pełniący funkcję kolektorów cząstek aerozolowych. W pracy rozważono i przebadano dwie konfiguracje procesowe - przepływ skrzyżowany i przepływ wirowy strumieni aerozolu i kropel.
The subject of this work is to compare the efficiency of dust capture for the cases of axial and radial flow from gas stream in the space impinging water jets for various process configurations. Cylindrical, coaxial impinging liquid jets serve as an axisymmetrical drop stream generator used here for dust collection.
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