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Research on Experiments and Numerical Simulation of the Flow Field for Colloid Hydrodynamic Cavitation Jet Polishing

Author: ZhangLingHua
Tutor: ZhangFeiHu
School: Harbin Institute of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Colloidal nanoparticles Numerical Simulation Flow field distribution Fluid flow pressure cavitation
CLC: TG664
Type: Master's thesis
Year: 2010
Downloads: 57
Quote: 0
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Abstract


With modern optical film with the rapid development of integrated circuit technology, optical parts and electronic components on the surface quality is getting higher and higher, many requirements to achieve ultra-smooth surface. Traditional mechanical grinding and polishing method is difficult to avoid the the subsurface damage brought about by the mechanical contact, and scholars from various countries are committed to pursuing the development of a super smooth surface processing method based on a new principle. In this paper, the the the nanoparticle colloidal liquid flow pressure cavitation jet efficient green super smooth surface processing methods exploratory study. First of all, the ordinary jet, rotating jet with cavitation jet theory, analysis. Studied the structural characteristics of submerged and non-submerged jet, ordinary cylindrical jet with swirling jet flow field, the study of the the cavitation jet production conditions as well as cavitation jet cavitation. Finite volume method were established for the submerged jet submerged jet flow field analysis of theoretical models, provides a theoretical basis for the flow field simulation and experimental exploration of the back. Secondly, the nanoparticle colloid jet flow field simulation analysis. Cone jet nozzle and rotating jet nozzle submerged jet field analysis, focusing on the overall speed of the flow field and pressure distribution, velocity and pressure distribution at the surface of the workpiece, and the turbulence intensity of the flow field and cavitation distribution law . Non-rotating jet nozzle submerged impinging jet were analyzed to compare the different characteristics of the submerged jet submerged jet flow field. Finally, the application of nano-particles of colloidal liquid flow pressure of the surface of the the jet the processing methods polishing K9 specimen optical glass, polishing experiments explore. Find a suitable polishing nozzle form of three different nozzle jet morphology and polishing effect. Analysis of experimental results, indicating that the nano-particle the colloidal fluid flow pressure of jet polishing removal effect is obvious, the polished workpiece surface appear white bumps and pitting; nanoparticle colloidal liquid polish change with different particle sizes and found that the surface The white raised reduced but still exist pitting confirmed the white raised for nanoparticle adhesion due. Water jet contrast after polishing pitting still exist, indicating that the effect of the high-pressure space under the effect of the destruction of the surface of the glass; workpiece surface pitting disappear, Characterization of the low-pressure space under the effect of the destruction of the surface with a low-pressure water jet polishing than weak, under low pressure for a relatively good polished surface obtained by polishing liquid to verify the the nanoparticle colloidal liquid flow pressure cavitation jet polishing used for processing a high-quality surface feasibility.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Special machine tools and processing > High - speed fluid processing equipment and processing
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