Summary
The natural damped coupled frequencies of a solidly rotating visco-elastic infinite liquid column with no axial dependency (∂/∂z=0, two-dimensional problem) have been determined. The frequency equation is numerically evaluated for a single visco-elastic liquid column, where the influence of the tension parameterTa/ϱv 2, the relaxation parameter τ*/a 2 and the rotational Reynoldsnumber\(\tilde Re = \Omega _0 a^2 /v(\tilde Re \equiv \sqrt {\tilde T} a,\tilde Ta\)=Taylornumber) has been determined. It was found that the liquid column becomes unstable for a rotational speed\(\Omega _0^2 \geqq \frac{T}{{\rho a^3 }}(m^2 - 1)\), which is much earlier than in the case of frictionless liquid, where\(\Omega _0^2 \geqq \frac{T}{{\rho a^3 }}m(m + 1)\). In addition the stability boundary does neither depend on the magnitude of the viscosity nor the Maxwell relaxation time τ* of the liquid. The complex frequencies are presented for the modem=2, where the cross-section of the liquid column assumes during its oscillation an elliptic shape.
Zusammenfassung
Es werden die gekoppelten gedämpften Frequenzen einer rotierenden visko-elastischen Flüssigkeitssäule ohne axiale Abhängigkeit (zweidimensionales Problem) aus nichtmischbaren Flüssigkeiten bestimmt. Die Frequenzgleichung einer einfachen viskoelastischen Säule wird numerisch ausgewertet, wobei der Einfluß des OberflächenspannungsparametersTa/ϱv 2, des Relaxationparameters τ* v/a 2 und der rotierenden Reynoldszahl\(\tilde Re = \Omega _0 a^2 /v\) untersucht wird. Die Flüssigkeitssäule wird instabil bei\(\Omega _0^2 \geqq \frac{T}{{\rho a^3 }}(m^2 - 1)\), unabhängig von der Größe der Viskosität und der Relaxationszeit. Bei reibungsfreier Flüssigkeit tritt diese Instabilität erst für größeres\(\Omega _0^2 \geqq \frac{T}{{\rho a^3 }}m(m + 1)\) auf. Es werden die komplexen Frequenzen für die elliptische Querschnitts-Schwingungsform m=2 berechnet.
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Die Veröffentlichung wurde aus Haushaltsmitteln der Universität der Bundeswehr München gefördert.
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Bauer, H.F. Surface- and interface oscillations of a rotating viscoelastic liquid column of immiscible liquids. Z. angew. Math. Phys. 37, 514–537 (1986). https://doi.org/10.1007/BF00945428
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DOI: https://doi.org/10.1007/BF00945428