Advanced Materials Research Vols. 317-319

Abstract: Many factors can have effect on flow field and performance, which makes the hydrocyclone design a complex work. Liquid’s viscosity is one of these factors, but it is costly and almost impossible to investigate how the liquid viscosity influences the performance of the hydrocyclone by test or experiment. At present, CFD technique provides us a convenient method for the flow field research in the hydrocyclone. This paper, intended to explore the effect of liquid’s viscosity on the flow field and hydrocyclone’s efficiency, presents a simulation to model the flow field in the hydrocyclone by changing the viscosity of the liquid. By comparing the results of the simulation, it is found that liquid with higher viscosity can reduce the velocity of the flow because of the friction between flow and wall and the friction between the two phases. Furthermore, viscosity increase of the liquid enlarges the area of shot flow and circulating flow, which make separating efficiency decrease and energy consumption rise.

Abstract: Abstract. The magnetic levitation linear feed unit is a new type of machine features. In machining, the tool and workpiece interaction force will be delivered to the table and make the deformation, resulting in processing errors of machine tools, machining of precision and surface quality. In this paper we established three-dimensional finite element model of the table of feed unit, use the finite element analysis software ANSYS to analysis of the transient dynamic analysis of the pre-designed table and improve the structure of the table at the design stage and forecast performance of the table and provide a theoretical basis for structure optimization.

Abstract: The different crystal (rutile, rutile-anntase-brookite, anatase, amorphous) titania were prepared by the hydrolysis of titanium tetrachloride (TiCl4) in the absence or presence of HCl or NaOH. The mixture solution was processed in microwave hydrothermal autoclave at 120oC for 1.5 h and then at 180oC for 1 h to precipitate titania. HCl acted as inhibitor, which could control the crystal and shape of the precipitate of titania. NaOH was used to adjust the pH to the required value. As a result, the mixture of rutile (majority), anatase and brookite (minor) was obtained from the aqueous TiCl4 solution without any addition, shuttle-like and well-dispersed nanocrystalline rutile appeared in the presence of HCl from the aqueous TiCl4-HCl solution. Single phase anatase was obtained in the presence of NaOH with pH=7, and when pH=9, the product was quite amorphous. The products were analyzed using XRD and TEM.

Abstract: In this paper, a cavitation analysis model for centrifugal pump was applied to simulate a three-dimensional turbulent flow inside a whole stage of a multistage centrifugal pump based on the Rayleigh-Plesset bubble equation. The 3-D turbulent flow field and vapor-liquid phase distribution in a multi-stage centrifugal pump were computed by solving the bubble equation coupled with two-phase turbulent governing equations. The process of bubble vaporization, growing and condensation were simulated and visualized. The cavitation model and simulation were validated by comparing numerical solutions with tested curve of net positive suction head required (NPSHr) for the pump.

Abstract: In the mould manufacturing projects, there are large numbers of uncertainties, such as change of customer demand, change of drawing, bad quality of products etc., and they often lead to numerous task reworked. Because of the random task reworking, the complete time of the project is uncertainty. Based on the critical chain project with task reworking, the paper carried out the research on setting of project buffer. We presented a new idea that the project buffer was calculated based on safety time and possible reworking time, and proposed a method to calculate the buffer of project reworking based on Discrete-time Markov chain. The problem that the classical method to setting critical chain project buffer is infeasible concerning task reworking was solved efficiently. The proposed method can set the project buffer more reasonable.

Abstract: To response the call of “constructing an economical society” and saving electricity consumption of public places, this paper designs an automatic control system of lumination in public places based on time, lighting intensity and personal distribution etc. It’s in low price that it is equivalent to a manual switch. Moreover, it’s low energy consumption, with steady performance, convenient installation without changing original line.

Abstract: Water jet cavitation peening is applied to improve the strength and mechanical properties of the friction-welded joints of titanium alloys. Scanning electron microscopy observations of the microstructure of the welded joints and welded area before/after water jet cavitation peening confirm slip dislocation at the microstructure near the surface of the specimens. The residual stress on the surface of the welded joint is measured by X-ray diffraction. The results indicate the effect of peening time on the strength of compressive residual stress.

Abstract: This paper presents the design of calendering machine and experimental results of calendering process. A particular pattern was printed on PET film by means of roll-to-roll gravure printing machine. The calendering process was applied to a set of samples and the effect was analyzed after measuring the surface roughness and the thickness of pattern. Although only mechanical pressure provided by a nip roll was applied during the calendering process, the experimental results indicate that the calendering process should be useful for enhancing the surface quality of roll-to-roll printed electronics products.

Abstract: Lots of integral impellers are used in the new kinds of jets. The jet engine weight can be lightened much, and the thrust,work life and the safety coefficient can be increased remarkably. Based on the integral impeller’s structure features and the processing difficulties with special complex blades, the shaping law on electrochemical contour evolution machining the blades is analyzed and studied, the multi-axis linkage movement feed tracks are designed optimum by the shaping laws and the tests. The combined cathode with the reasonable flowing fields is designed, there is an eccentric between the cathode sole plate and cathode body, the bidirectional feeds method is adopted, the short circuit and electro-discharged sparks damages are eliminated. The redundant rests in blades back is removed by adding wobbly feeds. Machining tests are carried out. The blades satisfying precision are produced.

Abstract: This paper presents a thorough study of a certain CPP shafting and analyzes the shafting natural vibration characteristic using FEM. Simulate the influences of CPP oil tubes on shafting natural frequency and compare it to hollow shaft natural frequency, then acquire the influencing law of CPP oil tubes disposition on the shafting vibration characteristic.