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Cavitation Rates in Water with Dissolved Gas and Other impurities

Journal of Thermal Science 2003年第2期12卷 151-156,170页

作者： PatrikZima Franti■ekMar■ík MilanSedlá■ Institute of Thermomechanics Academy of Sciences of CRDolejkova 518200Praha 8Czech RepublicInstitute of ThermomechanicsAcademy of Sciences of CRDolejkova 518200Praha 8Czech RepublicSIGMA Research and Development InstituteJana Sigmunda 7978350 LutínCzech Republic

Our objective is a better understanding of the role of physical properties of real fluids in the thermodynamics of cavitation in impure water. An extension to the classical homogenous nucleation theory suitable for mixtures is presented in attempt to address the discrepancy between the theoretical predictions and practical observations of cavitation rates in water at normal temperatures. The extension takes into account the non-equilibrium (dissipative) effects involved in nuclei formation through a substance dependent correction coefficient to be determined experimentally. The theory of thermodynamic fluctuations is applied to derive the work of formation of a bubble nucleus. The value of the correction coefficient is estimated using preliminary experimental data from a convergent-divergent nozzle. An application of the results to the numerical prediction of the cavitation zones in a radial-flow water pump is shown.

关键词： cavitation homogeneous nucleation water dissolved gas impurities.

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Effects of unsolvable impurities.on solidification of nonfaceted-faceted eutectic alloys

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Chinese Science Bulletin 1995年第21期40卷 1776-1778页

作者：李顺朴赵生旭陈熙琛 O.M.Barabash Institute of Physics Chinese Academy of Sciences Beijing 100080 China Institute of Metal Physics Kiev 252142 Ukraine

The formatting regulation of the nonfaceted and faceted plane in crystals is the important coverage in the field of crystallology research. Whether the transformation from faceted growth to nonfaceted growth can be achieved has long been a focal point because the crystallization mechanism influences the structural properties directly. Nowadays, it has been found that the transformation from faceted to nonfaceted growth of crystals can be induced when the overcooling of the melted alloys is high enough; other factors that can

关键词： eutectic nonfaceted-faceted low-melb’ng refractory impurities.

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