Wyniki wyszukiwania - BazTech

1

Przygotowanie próbki podstawą sukcesu!

Bars B. F., Martinez E., Grzeski H. N.

LAB Laboratoria, Aparatura, Badania

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2018

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R. 23, nr 4

6--9

2

Dispersed phase breakup at emulsion boiling

Pavlenko A. M.

Journal of New Technologies in Environmental Science

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2017

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Vol. 1, nr 4

171--180

EN

The processes of breakup and deformation of the dispersed phase is considered by many researchers [1-7], but these data require further study, which will determine the most profitable in economic and environmental terms parameters for their implementation. The classical theory of drops deformation and destruction depending on the turbulence level belongs to [3]. He considered this process as a result of realization of a large number of random events and on the basis of the probability theory he obtained the logarithmic drops distribution basing on the drops size. In general, the problem of breakup of liquid dispersions in a continuous medium is divided into two [3-5]: liquid droplets breakup in the emulsions and gas streams. When considering these processes the drop stability to the effecting forces is important, as these forces tend to destroy it. In most cases presented in references calculations are based on Bond and Weber criteria [1-4, 9], i.e. they consider only the Rayleigh-Taylor and Kelvin-Helmholtz instability, which are more specific for emulsification or destabilization of dispersed media. The droplets breakup and deformation processes while moving in a liquid are described in [3-5]. However, the existing models do not consider the breakup process of the secondary fluid with taking into account the formation of vapor layer at the boundary between the two phases as well as the force interaction regarding several simultaneously boiling particles of dispersed phase [8, 10, 11]. The vapor cavity formation is assumed to be homogeneous and only the maximum dynamic effects are considered, while the destruction of the dispersed phase can occur at any time due to the fact that the hydrodynamic environment even in the vicinity of two growing bubbles is undefined and if a particle of the dispersed phase is at some distance from these bubbles (or between them at a certain distance), then the effect of the particle breakup will be on reaching the maximum force that will exceed a critical value, calculated by Weber or Bond criteria, but it won’t necessarily be equal to maximum which can act in this system. The process becomes even more complicated and requires further study if we consider the breakup process of dispersed phase which begins to boil by itself.

3

Wielkość kropel podczas rozpraszania cieczy wzajemnie nierozpuszczalnych w mieszalniku wibracyjnym

Kamieński J., Wójtowicz R.

Inżynieria Chemiczna i Procesowa

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2001

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T. 22, z. 3C

597--602

PL

Przedstawiono wyniki badań rozpraszania cieczy wzajemnie nierozpuszczalnych w mieszalniku wibracyjnym. Analizowano wpływ parametrów geometrycznych i kinematycznych mieszania oraz własności dyspergowanych cieczy na wielkość wytworzonych kropel. Uzyskane wyniki opracowano w postaci zależności korelacyjnych opisujących średnice kropel w funkcji liczby Webera i jednostkowej mocy mieszania P/V.

EN

In the paper the experimental results of dispersion of two immiscible liquids in a vibromixer are presented. The drop diameters are analysed as a function of both the operating parameters and the properties of dispersed liquids. The experimental data are worked out as the correlation of Weber number and power dissipation P/V.