By Ki-Han Kim, Georges Chahine, Jean-Pierre Franc, Ayat Karimi
This e-book offers a accomplished therapy of the cavitation erosion phenomenon and state of the art study within the box. it really is divided into components. half 1 involves seven chapters, providing a variety of computational and experimental ways to cavitation erosion. It incorporates a basic creation to cavitation and cavitation erosion an in depth description of amenities and size options prevalent in cavitation erosion reports, an intensive presentation of assorted phases of cavitation harm (including incubation and mass loss) and insights into the contribution of computational easy methods to the research of either fluid and fabric habit. The proposed process relies on a close description of impression rather a lot generated by means of collapsing cavitation bubbles and a actual research of the fabric reaction to those quite a bit. half 2 is dedicated to a variety of 9 papers provided on the foreign Workshop on complicated Experimental and Numerical thoughts for Cavitation Erosion Prediction (Grenoble, France, 1-2 March 2011) representing the leading edge of study on cavitation erosion. cutting edge numerical and experimental investigations illustrate the main complicated breakthroughs in cavitation erosion learn.
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Additional resources for Advanced Experimental and Numerical Techniques for Cavitation Erosion Prediction
From the microstructural point of view, plastic deformation is directly related to nucleation and arrangement of deformation substructures usually made of dislocations, stacking faults, twins, and point defects. High strain rates induce higher density of dislocations , larger vacancy concentrations , and higher tendency for deformation twinning as compared to low strain rate . The contribution of each microscopic component to the total deformation depends not only on loading conditions but also on the stacking fault energy of the material .
L. Chahine et al. Fig. 7 Conventional CAVIJETÒ cavitating jet (left) and structured cavitating jet generated by a STRATOJETÒ (right). Both pictures were taken using large scale nozzles geometrically scaled up while conserving cavitation number and Strouhal number. 5 cm, while the right STRATOJETÒ orifice had a diameter of 1 cm. 5 Sample holder Sample holder Nozzle Nozzle Sample Sample Erosion pattern Fig. 5 cm. 5 cm. The right picture shows more specialized testing; here a cylindrically shaped sample is placed under the nozzle.
2 right). Cavitation clouds collapsing cylindrically were found to be much less erosive than the hemi-spherically collapsing cavitation clouds [12, 19]. Mass loss versus time curves on the same material (aluminum alloy Al 7075) for the two methods are presented in Fig. 4, which illustrates a mass loss rate by the direct method being almost twice that of the alternative method. The conventional test procedure using the ultrasonic vibrating horn method is to expose the sample to cavitation for a selected period of time, interrupt the test, remove the sample, and record weight to enable calculation of weight loss as a function of time.
Advanced Experimental and Numerical Techniques for Cavitation Erosion Prediction by Ki-Han Kim, Georges Chahine, Jean-Pierre Franc, Ayat Karimi