共查询到19条相似文献，搜索用时 515 毫秒
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超声波抑制积垢的影响因素与作用原理的研究 总被引：2，自引：0，他引：2
通过静态抑垢实验,研究了积垢溶液中[Ca2+]和[Mg2+]总浓度,溶液的pH值对超声抑垢的影响,得出超声抑垢的适宜条件;引进抑垢曲线新概念,直观地描述超声抑垢的效果,并从抑垢静态、动态实验得到验证;同时研究了超声波对溶液的电导率,表面张力的影响.最后,探讨了超声波的抑垢机理,为超声防垢的实际应用提供一定的理论依据. 相似文献
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马艳 《宁夏师范学院学报》2014,35(3):70-73
利用超声波降解罗丹明B来测量自制两用式超声波反应器和超声波——环流式反应器的声场,通过测定罗丹明B降解率的变化,研究了超声波反应器和超声环流反应器空化效应,并讨论影响超声波反应器和超声环流反应器的空化效应的因素及不同条件下的声场特征. 相似文献
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利用超声波萃取技术萃取辣椒粉中的苏丹红类染色剂,通过单因素实验对苏丹红的超声萃取条件进行了优化.考察了萃取剂、超声时间、液固比和超声温度对苏丹红萃取效果的影响.实验结果表明,辣椒粉中苏丹红的最佳超声波萃取条件为：萃取剂使用正己烷、超声时间30 min、液固比20∶1（mL/g）、超声温度50℃.最后采用毛细管电泳法对经最佳萃取条件处理后的辣椒粉样品及辣椒粉加标样品（含有苏丹红I号及II号）进行分析检测,最终检测出辣椒粉样品中含有3.04 mg/g苏丹红II号. 相似文献
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超声波作为一种新型技术,在农业、医疗、军事、航空、机械等领域应用十分广泛,在机械制造行业也进行了广泛的应用,如超声探伤、超声测距、超声焊接、超声清洗和超声加工等。超声波技术在机械制造过程中也存在许多的优势,作为一种新型技术,其广泛的应用必将推动社会科学技术的进步。 相似文献
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黄彦奕 《泉州师范学院学报》2015,(2):57-61
采用有限元软件ProCAST模拟GH4169合金金属液的凝固重熔过程,分析不同界面传热系数下的温度场变化,预测铸态组织的二次枝晶间距,并进行了相关实验验证.实验结果表明:对GH4169合金凝固重熔过程的模拟得到了与实验相符的结果,验证了该模拟方法和模型建立的可行性. 相似文献
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2017年我国玉米产量位居各粮食品种之首,但在玉米加工过程中对玉米片这一副产物的利用率较低.本研究以玉米皮为研究对象,通过对柠檬酸的添加量、料液比、超声波功率和超声时间等条件优化,确定超声波辅助法制备水溶性膳食纤维(SDF)的工艺条件.优化结果表明,当柠檬酸添加量为4%,料液比1:25,超声时间20min,超声波功率210w的条件下,水溶性膳食纤维的得率最高,达到27%.在应用过程中,该方法操作简单,提取周期短且SDF的得率较高. 相似文献
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In this paper the solidification behavior of Sn-Sb peritectic alloy and the mechanism of grain refinement in solidification process under high-intensity ultrasonic field are investigated. Three different powers of high-intensity ultrasound are introduced into molten Sn-Sb peritectic alloy to study the refining effectiveness. The results show that the application of high-intensity ultrasound during solidification process of Sn-Sb peritectic alloy can refine α phase and β phase and eliminate gravity segregation of the alloy. As acoustic intensity is increased from 400 W to 800 W, not only the homogenous fine structure can be obtained, but also the cubic β phase crystals tend to be spherical. Microstructure of the sample treated by 600 W high-intensity ultrasound demonstrates the best refining effect. 相似文献
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Microstructure Refinement of Sn-Sb Peritectic Alloy under High-Intensity Ultrasound Treatment 总被引：2，自引：0，他引：2
In this paper the solidification behavior of Sn-Sb peritectic alloy and the mechanism of grain refinement in solidification process under high-intensity ultrasonic field are investigated. Three different powers of high-intensity ultrasound are introduced into molten Sn-Sb peritectic alloy to study the refining effectiveness. The results show that the application of high-intensity ultrasound during solidification process of Sn-Sb peritectic alloy can refine a phase and β phase and eliminate gravity segregation of the alloy. As acoustic intensity is increased from 400 W to 800 W, not only the homogenous fine structure can be obtained, but also the cubic β phase crystals tend to be spherical. Microstructure of the sample treated by 600 W high-intensity ultrasound demonstrates the best refining effect. 相似文献
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针对气淬粒化装置中高炉渣颗粒的凝固行为,采用凝固熔化模型、流体体积函数模型和离散坐标辐射模型进行了三维瞬态模拟。考虑炉渣凝固过程中的物性参数变化,主要研究了颗粒的凝固过程、相界面移动速度、颗粒温度分布及周围空气速度分布。结果表明:颗粒凝固过程中固相分布不均匀,迎风面固相厚度大于背风面,这主要由迎风面空气速度比背风面快所致;固相-模糊区界面和模糊区-液相界面移动速度先增加后降低,这是由于在颗粒凝固前期导热系数的影响占主导地位、在凝固后期导热热阻的影响占主导地位;在凝固过程中,颗粒温度由外向内逐渐升高,内部温度降低缓慢。 相似文献
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近红外烘烤固化技术具有高效、清洁、安全、控制精度高,占用空间小及设备操作维护简单的优点,因而近年来在带钢涂层处理上获得大量应用。根据近红外烘烤固化技术在国内电镀锌产线高端涂层产品的生产实践,综合介绍了近红外烘烤固化的基本原理、技术特点以及在电镀锌无铬钝化涂层板生产工艺中的控制工艺。 相似文献
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结合科研实践活动,探讨了尾矿固化中的技术经济问题,提出了工艺技术路线、研究内容和方案。实践证明,应用沙土固化新技术,改变传统的采矿方法,能够解决采掘企业固体废弃物的排放问题,减少和消除地表崩落和塌陷现象。 相似文献
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In order to get a sound casting of the alloy with a solidification range, the principle of directional solidification (DS) and the layer-by-layer solidification(LBLS) should be followed, especially in designing foundry process of steel casting. Using the principles, the reasons for the forming of the defects on the surface of the chain wheels teeth and groove and the forming of MT (magnetic particle testing) thin lines were analyzed. The results of the metallographic observation and the numerical simulation show that the low temperature 相似文献
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For in-situ composite materials, the interaction between the second-phase particles and the solidification interface attracts more attentions of people, for concerning the final distribution of the particles on the matrix. With the conception of the local solidification time, a kinematics mechanism of particle pushing into the crystal boundary during the solidification process was assumed.Through the analysis of forces acted on the particle in front of the solid/liquid interface the critical velocity criterion for the particles pushing was given. The calculation results show when the growth rate of the interface V is less than or equals to the critical velocity Vc. the particles on the solid/liquid interface is pushed into the boundary region of cellular crystals, where they are distributed as a chain-like straight, which forms a particle-strengthened in-situ composite materials. 相似文献
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For in -situ composite materials,the interaction between the second-phase particles and the solidification interface attracts more attentions of people,for concerning the final distribution of the particles on the matrix.With the conception of the local solidification time,a kinematics mechanism of particle pushing into the crystal boundary during the solidification process was assumed.Through the analysis of forces acted on the particle in front of the solid /liquid interface the critical velocity criterion for the particles pushing was given.The calculation results show when the growth rate of the interface V is less than or equals to the critical velocity Vc,the particles on the solid/liquid interface is pushed into the boundary region of cellular crystals,where they are distributed as a chain-like straight,which forms a particle-strengthened in-situ composite materials. 相似文献
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许芝卉 《雁北师范学院学报》2007,23(2):13-16
通过对铸件凝固过程中各换热边界条件的研究，建立了凝固过程的二维非稳态温度场计算数学模型；并运用了有限差分方法对模型进行离散，得到大型方程组，并利用超松驰迭代法（即SOR法）解该方程组，据此，利用TurboC编制了计算机程序．上机运行结果表明，可较满意地模拟铸件凝固过程温度场的分布、 相似文献