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Recent progress on the jetting of single deformed cavitation bubbles near boundaries

Journal of Hydrodynamics 2023年第5期35卷 832-857页

作者： jing-zhu wang Guang-hang wang Qing-yun Zeng Yi-wei wang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of the Chinese Academy of SciencesBeijing100049China School of Future Technology University of the Chinese Academy of SciencesBeijing100049China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China Nanhai Institute of Harbin Engineering University Sanya572024China Guangdong Aerospace Research Academy Guangzhou511458China

Cavitation occurs widely in nature and engineering and is a complex problem with multiscale features in both time and space due to its associating violent oscillations. To understand the important but complicated phenomena and fluid mechanics behind cavitation, a great deal of effort has been invested in investigating the collapse of a single bubble near different boundaries. This review aims to cover recent developments in the collapse of single bubbles in the vicinity of complex boundaries, including single boundaries and two parallel boundaries, and open questions for future research are discussed. Microjets are the most prominent features of the non-spherical collapse of cavitation bubbles near boundaries and are directed toward rigid walls and away from free surfaces. Such a bubble generally splits, resulting in the formation of two axial jets directed opposite to each other under the constraints of an elastic boundary or two parallel boundaries. The liquid jet penetrates the bubble, impacts the boundary, and exerts a great deal of stress on any nearby boundary. This phenomenon can cause damage, such as the erosion of blades in hydraulic machinery, the rupture of human blood vessels, and underwater explosions, but can also be exploited for applications, such as needle-free injection, drug and gene delivery, surface cleaning, and printing. Many fascinating developments related to these topics are presented and summarized in this review. Finally, three directions are proposed that seem particularly fruitful for future research on the interaction of cavitation bubbles and boundaries.

关键词： Jetting cavitation bubble near complex boundaries bubble-based technique and their applications

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Mapping of QTL Associated with Drought Tolerance in a Semi-Automobile Rain Shelter in Maize (Zea mays L.)

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Agricultural Sciences in China 2011年第7期10卷 987-996页

作者： zhu jing-jing wang Xiao-peng SUN Cui-xia zhu Xiu-miao LI Meng ZHANG Guo-dong TIAN Yan-chen wang Ze-li National Key Laboratory of Crop Biology Ministry of Science and Technology/College of Life Sciences Shandong Agricultural University Tai＇an 271018 P.R.China

Drought is a major constraint in maize production worldwide. We studied quantitative trait loci （QTL） underlying drought tolerance for maize plants grown in two different environments. Traits investigated included ASI, plant height, grain yield, ear height, and ear setting. A genetic linkage map was constructed with 120 simple sequence repeat （SSR） markers based on an F2 population derived from a cross between D5 （resistant parent） and 7924 （susceptible parent）. Correlation and heritability were calculated. QTLs of these traits were identified by composite interval mapping combined with a linkage map covering 1 790.3 cM. The markers were arranged in ten linkage groups. QTL mapping was made of the mean trait performance of the 180 F2：3 population. The results showed five, five, six, four, and five QTLs for ASI, plant height, grain yield, ear height, and ear setting under full irrigation condition, respectively, and four, seven, six, four, and four QTLs for ASI, plant height, grain yield, ear height, and ear setting under severe late stress conditions, respectively. Especially the four QTLs detected for five traits in 2008 and 2009. The universal QTLs information generated in this study will aid in undertaking an integrated breeding strategy for further genetic studies in drought tolerance improvement in maize.

关键词： maize drought tolerance simple sequence repeat quantitative trait loci

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Numerical study on formation of a splash sheet induced by an oscillating bubble in extreme vicinity to a water surface

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Journal of Hydrodynamics 2022年第6期34卷 1021-1031页

作者： Guang-hang wang Yan Du Zhi-jian Xiao Jian Huang Zhi-ying wang Hong-chen Li jing-zhu wang Yi-wei wang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Future Technology University of the Chinese Academy of SciencesBeijing100049China School of Engineering Science University of the Chinese Academy of SciencesBeijing100049China Department of Biomedical Engineering ThoraxcenterErasmus MC University Medical Center RotterdamRotterdamThe Netherlands

When it is generated in extreme vicinity to a water surface,an oscillating bubble bursts into the atmosphere and high-pressure gas is simultaneously exhausted from it,forming a splash sheet and an open *** dynamics of the splash sheet induced by the bursting of the oscillating bubble has drawn increasing attention,but it is not clearly *** conduct a numerical simulation in the framework of open-source software *** volume of fluid and Reynolds-Averaged Navier-Stokes methods are used to precisely capture the gas-liquid interface and obtain flow structure,*** addition,an experimental setup is carried out based on an object distance compensation method for validation of the numerical *** patterns are summarized:(1)An open splash,(2)A sealed splash depending on whether a splash sheet completely *** numerical results shows that the bubble bursting is induced by the Rayleigh-Taylor ***,the splash closures are discussed for two patterns.

关键词： Cavitation bubble ventilation splash sheet flow patterns Rayleigh-Taylor instability

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Jetting of a near-wall cavitation bubble induced by another tandem bubble

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Journal of Hydrodynamics 2024年第3期36卷 444-456页

作者： Hui Han jing-zhu wang Jian-lin Huang Peng-bo Bai Yong-gang Chen Yi-wei wang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China Guangdong Aerospace Research Academy Guangzhou511458China School of Future Technology University of Chinese Academy of SciencesBeijing100049China Jianghuai Advance Technology Center Hefei230088China

Double bubbles near a rigid wall surface collapse to produce a significant jet impact,with potential applications in surface cleaning and ultrasonic ***,the dynamic behaviors of near-wall bubbles remain *** this study,we investigate the jetting of a near-wall bubble induced by another tandem *** define two dimensionless standoff distances,γ_(1),γ_(2),to represent the distances from the center of the near-wall bubble to the rigid wall and the center of controlling bubble to the center of the near-wall bubble,*** observations reveal three distinct jetting regimes for the near-wall bubble:transferred jetting,double jetting,and directed *** further investigate the jetting mechanism,numerical simulations are conducted using the compressibleInterFoam solver in the open-source framework of OpenFOAM.A detailed analysis shows that the transferred jet flow is caused by the pinch-off resulting from the axial contraction velocity at the lower end of the near-wall bubble being greater than the vertical contraction velocity,leading to a maximum jet velocity of 682.58 m/*** the case of double jetting,intense stretching between the controlling bubble and the wall leads to a pinch-off and a double jetting with a maximum velocity of 1096.29 m/*** directed jet flow is caused by the downward movement of the high-pressure region generated by the premature collapse of the controlling bubble,with the maximum jet velocity reaching 444.62 m/s.

关键词： Jetting of near-wall bubble controlling bubble impact velocity

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Numerical study on influence of structural vibration on cavitating flow around axisymmetric slender body

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Journal of Hydrodynamics 2018年第6期30卷 1182-1185页

作者： jing-zhu wang Te-zhuan Du Yi-wei wang Cheng-guang Huang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

The unsteady behaviors of cloud cavitating flow would lead to structural vibration and deformation that conversely affect its development. The present paper aims to preliminarily discuss the influences of structural vibration on the development of the cavitating flow. Simulations of a slender body are carried out under different vibration amplitudes and frequencies. The results show that the structural vibration causes alternate variation of local attack angle at the head of the body, and thus changes the development of cavitation and re-entrant jet. On the downstream side, the length and thickness of the cavity are larger than that on the upstream side due to larger area of negative pressure. For a large vibration amplitude, alternate variations of the local attack angle change the adverse pressure gradient at the closure of the cavity, and then affect the development of the re-entrant jet, so that the phenomena of local shedding of the cavitation happen, compared with global shedding in the case of no structural vibration. For a frequency larger than 0.05, transverse speed of the vibration is suggested to be a dominant factor in controlling the behavior of the cavitating flow besides the local attack angle, since it causes local cavitating phenomena.

关键词： Structural vibration amplitude and frequency attack angle local shedding of cavitation transverse vibration speed local cavitating

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On-line solid-phase extraction using alizarin violet functionalized silica gel for determination of trace lead in environmental samples and wastewater by sequential injection spectrophotometry

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Science China Chemistry 2011年第6期54卷 998-1003页

作者： FAN jing, zhu GuiFen, wang HaiBo & wang JianJi Henan Key Laboratory for Environmental Pollution Control Key Laboratory for Yellow and Huai River Water Environmental and Pollution Control, Ministry of Education School of Chemical and Environmental Sciences, Henan Normal University, Xinxiang 453007, China 1. Henan Key Laboratory for Environmental Pollution Control Key Laboratory for Yellow and Huai River Water Environmental and Pollution Control Ministry of Education School of Chemical and Environmental Sciences Henan Normal University Xinxiang 453007 China

Trace of Pb(Ⅱ) has been on-line separated and enriched from environmental samples and wastewater by using the self-made alizarin violet functionalized silica gel micro-column coupling with a sequential injection sampling technology. The determination is based on the color reaction of Pb(Ⅱ) with iodide and crystal violet to form an ionic association complex in the presence of polyvinyl alcohol and hydrochloric acid. The use of the microcolumn can prevent the interference of most familiar metal ions, and therefore improve the selectivity and sensitivity of this analytical technique. The proposed method was used for the determination of Pb(Ⅱ) in environmental samples and wastewater. No statistically significant difference was observed between the results determined by the present method and atomic absorption spectrometry.

关键词： on-line solid-phase extraction sequential injection lead environmental sample alizarin violet functionalized silica gel

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Report on the 10 cases of allergic reactions to oxaliplatin

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The Chinese-German Journal of Clinical Oncology 2010年第10期9卷 610-612页

作者： Rui Zhang jing zhu Sheng wang Lixia Ma Department One of Physical Oncology Jilin Provincial Tumor Hospital Changchun 130012 China

Objective： The aim of this study was to investigate the mechanism, clinical manifestations, prevention and treatment measures of allergic reactions caused by oxaliplatin. Methods： Made detailed data about allergic reactions to oxaliplatin from 10 patients in our department, and made analysis and discussions about it while referring to related reference. Results： All the 10 patients had no history of allergies, 4 cases of allergies occurred during the course of multi-cycle chemotherapy, and 6 cases occurred on the first time of drug administration, whose allergic symptoms were present in the process of using oxaliplatin, with the infusion time from 10 to 25 rain. When relevant treatments such as drug withdrawal, hormone, intravenous calcium gluconate and magnesium sulfate were done to the patients, related symptoms could be soon relieved. Conclusion： Mechanisms of oxaliplatin allergic are still unclear. Applying calcium and magnesium may reduce the risk of neurotoxicity and reduce the degree of allergic reactions before administration of oxaliplatin.

关键词： oxaliplatin allergic reactions

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Development of Multilayer Optics for the EUV, Soft X-ray and X-ray Regions in Tongji University

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光机电信息 2005年第12期22卷 12-21页

作者： wang Zhan-shan zhu jing-tao wang Hong-chang wang Feng-li CHEN Ling-yan Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 200092 China

In EUV and X- ray regions, multilayer mirrors are the essential and necessary optics elements. The good prospects of the EUV and X- rays for next generation lithography system, microscopy in the “water windows”, astro- nomical telescope, spectroscopy, plasma diagnostics, and X- ray laser have impelled the development of multilayer optics. The paper introduces the recent results of the multilayer optics elements in Tongji University, including beam splitters, broadband/angular polarizers, supermirrors and high- reflectance mirrors. The product of reflectivity and transmissivity is above 4% for the Mo/Si multilayer beam splitter. Over the 15￣17 nm wavelength range, the s- re- flectivity of the non- periodic Mo/Si broadband multilayer polarizers is reasonably constant, as high as 36.6%, and the degree of polarization is more than 97.8%. At the fixed energy of 8 keV (Cu Kαline), the W/Si supermirror has the reflectivity of above 30% in the angle range of 0.4°￣0.85°, and a W/B4C supermirror has the reflectivity of about 20% in the angle range of 0.9°￣1.2°, and the reflectivity of W/C supermirror working in the grazing incident angle range of 0.9°￣1.2°is about 20%. The experimental results of some high- reflectance mirrors in our lab are also pre- sented, such as Mo/Si, Mo/Y, Cr/C, La/B4C, Si/C and Si/SiC. The reflectivity of Mo/Si multilayer is as high as 61.1% at wavelength of 13.4 nm.

关键词： EUV 软X射线同济大学多层膜应用光学电子束宽带偏振器

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多孔Pd/TiO_2-Al_2O_3催化剂上乙醇完全氧化的研究（英文）

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分子催化 2017年第1期37卷 1-10页

作者：朱靖王彦平李哲太原理工大学化学化工学院山西太原030024

利用模板剂-浸渍法制备出了不同焙烧温度下的多孔复合材料TiO_2-Al_2O_3和Pd/Al_2O_3-TiO_2催化剂来催化氧化乙醇.样品经过XRD,FT-IR,孔结构分析、TEM、XPS、脉冲吸附、NH_3-TPD等进行表征分析.250℃焙烧的Pd/TiO_2-Al_2O_3催化剂具有... 详细信息

利用模板剂-浸渍法制备出了不同焙烧温度下的多孔复合材料TiO_2-Al_2O_3和Pd/Al_2O_3-TiO_2催化剂来催化氧化乙醇.样品经过XRD,FT-IR,孔结构分析、TEM、XPS、脉冲吸附、NH_3-TPD等进行表征分析.250℃焙烧的Pd/TiO_2-Al_2O_3催化剂具有最高的乙醇转化率和CO_2生成率.高比表面积、均匀分散的金属Pd颗粒和丰富的表面吸附氧是其具有高的催化活性的主要原因.

关键词：多孔Al2O3-TiO2复合材料 Pd催化剂乙醇氧化

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准β热处理工艺对TC4-DT钛合金裂纹扩展行为的影响

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稀有金属 2017年第7期41卷 745-750页

作者：李静朱知寿王新南费跃商国强祝力伟北京航空材料研究院中航工业先进钛合金航空科技重点实验室北京100095

研究了准β热处理工艺窗口参数(保温时间和加热温度)对损伤容限型TC4-DT钛合金的疲劳裂纹扩展行为的影响,并采用金相显微镜(OM)和扫描电镜(SEM)从显微组织、裂纹扩展路径及断口形貌进行了分析对比。结果表明:随着保温时间从5 min延长至1... 详细信息

研究了准β热处理工艺窗口参数(保温时间和加热温度)对损伤容限型TC4-DT钛合金的疲劳裂纹扩展行为的影响,并采用金相显微镜(OM)和扫描电镜(SEM)从显微组织、裂纹扩展路径及断口形貌进行了分析对比。结果表明:随着保温时间从5 min延长至15 min,原始β晶粒尺寸从130μm增大到230μm,转变点处ΔKt由17.5 MPa·m^(1/2)增大至19.4 MPa·m^(1/2),当10 MPa·m^(1/2)≤ΔK≤20 MPa·m^(1/2)的低应力范围,裂纹扩展速率降低;随着加热温度从988℃升高至998℃,原始β晶粒尺寸从130μm增大至240μm,转变点处ΔKt由17.5 MPa·m^(1/2)增大至18.0 MPa·m^(1/2),转折点前的裂纹扩展区的裂纹扩展速率降低;当温度继续升高至1008℃时,原始β晶粒尺寸增大至400μm,转折点处ΔKt增大至20.5 MPa·m^(1/2),裂纹扩展速率在转折点附近降低,但在ΔK≥20.5 MPa·m^(1/2)的较大应力区域时,裂纹扩展速率无明显变化;温度升高或保温时间延长,裂纹扩展路径曲折度增加,二次裂纹数量增多、深度增加,断口表面粗糙度降低。

关键词： TC4-DT钛合金准β热处理保温时间加热温度裂纹扩展速率

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