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P.J. Sell E. Maisch J. Siekmann 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1984,4(5):49-52
The wetting kinetics of model tubes of different geometrical shape has been investigated theoretically and experimentally under conditions of simulated zero-gravity (earthbound laboratory experiments) and low gravity (sounding rocket experiments within the TEXUS-programme). The present note deals with the hydrodynamic forces (capillary-, friction-, inertia forces, etc.) resulting from capillary rise in cylindrical, conical and sinusoidal tubes. The rôle of these forces is studied numerically in some detail. 相似文献
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The recent result of an orbit continuation algorithm has provided a rigorous method for long-term numer- ical integration of an orbit on the unstable manifold of a periodic solution. This algorithm is matrix-free and em- ploys a combination of the Newton-Raphson method and the Krylov subspace method. Moreover, the algorithm adopts a multiple shooting method to address the problem of orbital instability due to long-term numerical integra- tion. The algorithm is described through computing the extension of unstable manifold of a recomputed Nagata~s lower-branch steady solution of plane Couette flow, which is an example of an exact coherent state that has recently been studied in subcritical transition to turbulence. 相似文献
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Julius H. Cahn 《Space Science Reviews》1980,27(3-4):457-466
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Fluid transport in capillary systems under microgravity 总被引:1,自引:0,他引:1
The wetting kinetics of model tubes of different geometries has been investigated experimentally and theoretically under conditions of simulated zero-gravity and microgravity. Numerical calculations of meniscus configurations and the rise of the menisci in tubes of different shape are compared with photographic pictures obtained from sounding rocket experiments (TEXUS-Programme). It is demonstrated that menisci under microgravity conditions are essentially different from those of simulated zero-g-experiments. These results, together with observed streamline patterns, yield valuable information with respect to the hydrodynamic deformation of phase interfaces and dynamic contact angles. 相似文献
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