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

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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Membrane Transporters for Nitrogen,Phosphate and Potassium Uptake in Plants

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Journal of Integrative Plant Biology 2008年第7期50卷 835-848页

作者： yi-Fang Chen yi wang wei-Hua Wu State Key Laboratory of Plant Physiology and Biochemistry College of Biological Sciences China Agricultural University National Plant Gene Research Centre Beijing 100094 China

Nitrogen, phosphorous and potassium are essential nutrients for plant growth and development. However, their contents in soils are limited so that crop production needs to invest a lot for fertilizer supply. To explore the genetic potentialities of crops （or plants） for their nutrient utilization efficiency has been an important research task for many years, in fact, a number of evidences have revealed that plants, during their evolution, have developed many morphological, physiological, biochemical and molecular adaptation mechanisms for acquiring nitrate, phosphate and potassium under stress conditions. Recent discoveries of many transporters and channels for nitrate, phosphate and potassium uptake have opened up opportunities to study the molecular regulatory mechanisms for acquisition of these nutrients. This review aims to briefly discuss the genes and gene families for these transporters and channels, in addition, the functions and regulation of some important transporters and channels are particularly emphasized.

关键词： Arabidopsis channel nitrate potassium phosphate transporter.

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

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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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Synthesis and Crystal Structure of Bis[2-[2-(diethylamino)ethyliminomethyl]-4-nitrophenolato]dimethanolcobalt(II) Dinitrate

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Chinese Journal of Structural Chemistry 2006年第9期25卷 1090-1094页

作者： wei yi-Jun wang Feng-Wu ZHU Qi-Yong Department of Chemistry. Huainan Normal College Huainan 232001 China

The title mononuclear cobalt（Ⅱ） complex [Co（DENP）2（MeOH）2].2NO3 （DENP = 2-[2-（diethylamino）ethyliminomethyl]-4-nitrophenolate） was prepared and characterized by elemental analysis, 1R and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1 with a = 8.297（1）, b = 11.075（2）, c = 11.134（2） ,A,α = 69.69（1）, β = 70.97（2）, γ = 84.02（2）°, Z = 1, V = 907.0（4） ,A^3, Dc= 1.424 g/cm^3, Mr = 777.66, λ（MoKα） = 0.71073 A,μ= 0.548 mm^-1, F（000） = 409, R = 0.0628 and wR = 0.1734. The complex consists of a [Co（DENP）2- （MeOH）2]^2＋ cation and two disordered nitrate anions. The Co atom, lying at the inversion centre, is six-coordinated by two DENP ligands and two MeOH molecules in an octahedral geometry. The molecules in the crystal are linked through intermolecular O-H...O, O-H...N and N-H...O hydrogen bonds, forming chains parallel to the b axis.

关键词： Schiff base cobalt crystal structure

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Self-propelled swimming of a flexible fllament driven by coupled plunging and pitching motions

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Journal of Hydrodynamics 2021年第1期33卷 157-169页

作者： Bing-lin Li yi-wei wang Bo yin Xiang Zhang Xing Zhang The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

This paper numerically investigates the self-propelled swimming of a flexible filament driven by coupled pitching and plunging motions at the leading *** influences of bending rigidity and some actuation parameters(including the phase offset between pitching and plunging,and the amplitudes of pitching and plunging motions)on the swimming performance are *** is found that with increasing rigidity,the swimming style gradually transits from the undulatory mode to the oscillatory *** plunging-pitching actuation is found to be superior to the plunging-only actuation,in the sense that it prevents the decrease of speed at high rigidity and achieves a higher efficiency across a wide range of *** comparison of the body kinematics with those of animal swimmers,and the classification of the wake structures are *** results of this study provide some novel insights for the bio-inspired design of autonomous underwater vehicles.

关键词： Self-propelled swimming flexible filament fluid-structure interaction(FSI) vortex structures immersed boundary method

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Numerical investigations of the transient cavitating vortical flow structures over a flexible NACA66 hydrofoil

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Journal of Hydrodynamics 2020年第5期32卷 865-878页

作者： Ren-fang Huang Te-zhuan Du yi-wei wang Cheng-guang Huang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China

In this paper,the cavitating flow over a flexible NACA66 hydrofoil is studied numerically by a modified fluid-structure interaction strategy with particular emphasis on understanding the flow-induced vibration and the cavitating vortical flow *** modified coupling approaches include(1)the hydrodynamic solution obtained by the large eddy simulation(LES)together with a homogenous cavitation model,(2)the structural deformation solved with a cantilever beam equation,(3)fluid-structural interpolation and volume mesh motion based on the radial basis functions and greedy *** the flexible hydrofoil,the dominant flow-induced vibration frequency is twice of the cavity shedding *** cavity shedding frequency is same for the rigid and flexible hydrofoils,demonstrating that the structure vibration is not large enough to affect the cavitation *** predicted cavitating behaviors are strongly three-dimensional,that is,the cavity is(a)of a triangular shape near the hydrofoil tip,(b)of a rectangular shape near the hydrofoil root,and(c)with a strong unsteadiness in the middle of the span,including the attached cavity growth,oscillation and shrinkage,break-off and collapse *** unsteady hydroelastic response would strongly affect the cavitation shedding process with small-scale fragments at the cavity rear ***,three vortex identification methods(i.e.,the vorticity,the Q-criteria and the Ω method)are adopted to investigate the cavitating vortex structures around the flexible *** is indicated that the cavity variation trend is consistent with the vortex *** vortex structures are distributed near the foil trailing edge and in the cavitation region,especially at the cavity-liquid *** the transporting downstream the shedding cavities,the vortices gradually increase in the wake flows.

关键词： Cloud cavitation flexible hydrofoil Ωmethod flow-induced vibration

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Malignant solitary fibrous tumor in the central nervous system treated with surgery,radiotherapy and anlotinib:A case report

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World Journal of Clinical Cases 2022年第2期10卷 631-642页

作者： Dong-Yong Zhang Lan Su yi-wei wang Department of Neurosurgery the First Affiliated Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina Department of Genetron Health Genetron HealthBeijing 110024China Department of Anatomy Shenyang Medical CollegeShenyang 110034Liaoning ProvinceChina

BACKGROUND Solitary fibrous tumor(SFT)of the central nervous system is *** is predominantly benign and rarely *** is no established standardized treatment regimen for malignant intracranial *** SUMMARY We present a rare case of SFT in a 9-year-old girl with a space-occupying effect in the frontal-parietal *** underwent craniotomy,and the mass was *** examination of the specimen showed that Ki-67 proliferation index staining was highly positive in 80%of tumor *** exome sequencing of the surgical tissue showed 38 somatic gene mutations and 1 gene amplification such as fibroblast growth factor receptor 4 or *** 1.5 mo after surgery,head magnetic resonance imaging revealed that the tumor had *** patient received 60 Gy and 30 fractions of intensity modulated *** patient then received anlotinib 8 mg po qd for 1-14 d of a 21 d *** this regimen,the patient achieved stable disease for>17 *** resonance imaging at 1.5 year after surgery showed that the tumor had not *** This is the first reported case of SFT of the central nervous system treated with surgery,radiotherapy and *** regimen may be an effective treatment option for malignant intracranial SFT patients.

关键词： Anlotinib Biological therapy Mutation Recurrence Sequence analysis Case report

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Enucleation combined with guided bone regeneration in small and medium-sized odontogenic jaw cysts

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World Journal of Clinical Cases 2022年第9期10卷 2764-2772页

作者： yi-Ting Cao Qin-Hua Gu yi-wei wang Qian Jiang Department of Pediatric Dentistry Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Center for StomatologyNational Clinical Research Center for Oral Diseases Shanghai Key Laboratory of Stomatology Shanghai 200011China Department of Stomatology Shanghai Ninth People’s Hospital Huangpu BranchShanghai Jiao Tong UniversitySchool of MedicineShanghai 200125China Department of Oral Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyShanghai 200011China

BACKGROUND The odontogenic jaw cyst is a cavity containing liquid,semifluid or gaseous components,with the development of the *** recent years,with the rapid development of oral materials and the transformation of treatment of jaw cysts,more options are available for treatment of postoperative bone defect of jaw *** bone regeneration(GBR)places biomaterials in the bone defect,and then uses biofilm to separate the proliferative soft tissue and the slow-growing bone tissue to maintain the space for bone regeneration,which is widely used in the field of *** To observe the clinical effect of GBR in repairing bone defect after enucleation of small and medium-sized odontogenic jaw *** From June 2018 to September 2020,13 patients(7 male,6 female)with odontogenic jaw cysts were treated in the Department of Oral Surgery,Ninth People’s Hospital,Shanghai Jiao Tong University School of *** without hypertension,heart disease,diabetes or other systemic diseases were *** diagnosis was based on the final pathological results:11 cases were diagnosed as apical cysts,one as primordial cyst,and one as dentigerous *** lesions were located in the maxilla in seven cases,and in the mandible in six *** cases were treated with the same method of enucleation combined with *** Three to four months after the operation,the boundary between the implant site and the surrounding normal stroma was not obvious in patients with small-sized odontogenic jaw *** patients with tooth defects were treated with implant after 6 *** the patients with medium-sized odontogenic jaw cysts,the density of the center of the implant area was close to the normal mass at 6 mo after surgery,and there was a clear boundary between the periphery of the implant area and the normal *** boundary between the periphery of the implant area and the normal mass was blurred at 8-9 mo after *** with tooth defects were treated wit

关键词： Enucleation Bone defect Guided bone regeneration Small and medium-sized Odontogenic jaw cysts

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Numerical simulation of bubble detachment at submerged orifice and analysis of interface stability

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Journal of Hydrodynamics 2019年第2期31卷 293-302页

作者： Xian-xian Yu yi-wei wang Chen-guang Huang Te-zhuan Du Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of ScienceBeijing 100049China Beijing Institute of Mechanical and Electrical Engineering Beijing 100074China

This paper presents the experimental and numerical results of the bubble detachment from a submerged orifice at a constant gas flow *** compressible large eddy simulation combined with the volume of fluid method is adopted in the simulation and is validated by *** transition criterion from the elongation stage to the detachment is *** the detaching stage in the simulation,the distributions of the pressure and the surface tension on the cylindrical bubble neck are *** Rayleigh-Plesset equation in the cylindrical coordinate frame is used to describe this *** on the comparison between the numerical results and the equation analysis,a reference value of the uncertain integral parameter in the equation is determined.

关键词： Bubble interfacial dynamics large eddy simulation instability criterion Rayleigh-Plesset equation

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Cryptococcal antigen testing of lung tissue homogenate improves pulmonary cryptococcosis diagnosis:Two case reports

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World Journal of Clinical Cases 2022年第12期10卷 3893-3898页

作者： wei-yi wang Yu-Lu Zheng Li-Bin Jiang Department of Respiratory Medicine The First Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou 310006Zhejiang ProvinceChina Department of Respiratory Medicine The Third Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou 310000Zhejiang ProvinceChina

BACKGROUND Pulmonary cryptococcosis(PC)is an opportunistic infectious disease of the respiratory *** tissue biopsies,culture of respiratory samples(e.g.,sputum,lung tissue,pleural fluid,and bronchoalveolar lavage fluid),and cryptococcal antigen(CrAg)testing are helpful for a definitive ***,these tests are sometimes falsely *** is often misdiagnosed or underdiagnosed owing to the absence of obvert symptoms,poor imaging specificity,and false-negative laboratory *** SUMMARY We report two female patients who underwent computed tomography-guided percutaneous needle pulmonary biopsy of a lung nodule for a confirmed *** both patients,the CrAg test on the lung biopsy tissue homogenate was positive,while the serum CrAg test was *** with the lung tissue pathology,we made the diagnosis of *** therapy was effective in both *** Given the findings of our cases and the literature review,lung tissue homogenate CrAg testing can be helpful in improving the diagnosis of PC.

关键词： Lung tissue homogenate Cryptococcal antigen test Pulmonary cryptococcosis Lung biopsy Diagnosis Case report

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