Article
Engineering, Marine
Chang Xu, Xiang Zhao, Boo Cheong Khoo
Summary: This paper analyses the ventilated cavitating flow over a high-speed underwater vehicle using a multi-phase solver. The results show that air ventilation can reduce pressure fluctuations at the vehicle's surface and achieve a drag reduction of up to 85% at a moderate natural cavitation number.
Article
Engineering, Chemical
Jun Wang, Lun Sun, Yilong Zhou, Yaohui Liu, Fujian Zhao
Summary: We enhanced the Zwart-Gerber-Belamri (ZGB) cavitation and RNG turbulence models to accurately simulate the cavitation characteristics of centrifugal pumps. The modified models considered the rotational motion characteristics and small fluctuations in rotational speed caused by hydraulic excitation force. The results showed that the improved model better predicted the cavitation performance and the area covered by cavities was 1/4 of the suction side of the vane when the cavitation degree increased.
Article
Multidisciplinary Sciences
Shixian Wu, Heqing Liu, Yongping Chen
Summary: A novel air-ring flow regulating valve was proposed in this study to reduce flow resistance in fluid transportation pipeline systems. The valve showed lower resistance coefficient and reduced wall shear stress compared to the standard center butterfly valve, leading to improved efficiency and longer service life.
Article
Engineering, Multidisciplinary
Ziyang Wang, Huaiyu Cheng, Bin Ji
Summary: This study investigates the unsteady cavity shedding mechanism around a NACA66 hydrofoil using a self-defined compressible cavitation solver and dynamic subgrid-scale model. The results show satisfactory agreement with experimental data and provide deeper insight into pressure wave characteristics during cavity contraction. The study compares the influences of re-entrant jet and condensation shock on local flow patterns in terms of duration, velocity, cavity behavior, formation mechanism, and pressure intensity.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Marine
Bo Liu, Min Xiang, Zeyang Xie, Weihua Zhang
Summary: By using the open source CFD tool OpenFOAM, a multiphase solver is used to investigate ventilated supercavities. The VOF method is employed to capture cavity interface and the free surface. The main objective is to study the shape and asymmetry of ventilated supercavities.
Article
Engineering, Mechanical
Mohammad Hossein Arabnejad, Urban Svennberg, Rickard E. Bensow
Summary: The paper proposes a numerical method based on energy description to assess the risk of cavitation erosion, with two improvements compared to other methods. Validation with experimental data shows good agreement between predicted high erosion risk areas and experimental erosion patterns. The method can also be used to study the relationship between cavity dynamics and cavitation erosion risk.
Article
Engineering, Mechanical
Ziyang Wang, Huaiyu Cheng, Rickard E. Bensow, Xiaoxing Peng, Bin Ji
Summary: This study investigates the cavitation erosion risk on a twisted hydrofoil using a hybrid Eulerian-Lagrangian solver. A combination of the volume of fluid method and the discrete bubble model is employed to accurately identify high erosion risk regions and evaluate the distribution and intensity of impact pressures from bubbles. The study also analyzes the hydrodynamic mechanisms of cavitation erosion, revealing that the highest erosion risk occurs in areas where primary shedding occurs and that high impact pressure bubbles concentrate around the edges of the shedding cavity.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Eric Goncalves da Silva, Philippe Parnaudeau
Summary: This paper presents a numerical study on the strong loads generated by the collapse of an air bubble in water subjected to a normal shock wave near a wall. The distance of the initial bubble to the wall has significant effects on the collapse dynamics and maximum wall pressure, potentially causing wall damage. Additionally, a power-law relationship for the evolution of the maximum pressure peak with respect to the stand-off distance is proposed, and a twin-bubble collapse simulation is performed to illustrate collective effects and pressure peak amplification at the wall.
Article
Thermodynamics
Alex Maliska de Moura, Elizaldo Domingues dos Santos, Jeferson Avila Souza
Summary: A numerical study on the design of fins geometry for a microchannel heat sink was performed based on the Constructal Theory. The study aimed to develop a deterministic method to predict the positioning and size of heat sink fins in order to achieve the lowest possible thermal resistance. The OpenFOAM software and Finite Volume method were used to solve the model equations, resulting in 12 different geometries of fins. The results showed that the best configurations combined a large fins occupation area with a low coolant flow rate, and the optimal thermal performance relied on the appropriate amount of solid material in the heat sink channel.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Computer Science, Interdisciplinary Applications
Mohammad-Reza Pendar, Ali Alavi, Ehsan Roohi
Summary: The aim of this study is to provide a detailed understanding of the unsteady hydrodynamic characteristics of cavitating flow and the effect of a wavy leading edge (WLE) on noise suppression. The results show that the formation of leading-edge vortex and flow separation dynamics fundamentally differ between WLE and straight-leading-edge (SLE) hydrofoils. The main difference in turbulent flow between WLE and SLE hydrofoils is the formation of counter-rotating streamwise vortex pairs.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2023)
Article
Physics, Multidisciplinary
Jianwei Che, Guangfeng Shi, Tianwen Zhou
Summary: This paper analyzes the dynamics of cavitation bubbles with free interface and rigid interface in ultrasound assisted electrochemical polishing. The models of single cavitation bubble and two cavitation bubbles are established, and the influence of various factors on the dynamics of cavitation bubble is analyzed. The results show that within a certain range of factors, the motion of cavitation bubbles is beneficial. This provides a theoretical basis for further research on the mechanism of ultrasonic assisted electrochemical polishing.
Article
Chemistry, Multidisciplinary
Wenqiang Dong, Ligang Yao, Weilin Luo
Summary: A numerical simulation of a submerged angular cavitation nozzle is performed using CFD technique with a multiphase mixture model, cavitation model, and RNG k-epsilon turbulence model. The effects of the contraction part, parallel middle part, and expansion part on velocity and vapor volume fraction are studied. The results show that optimizing the nozzle structure can improve cavitation effect, which is verified by experimental data.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Yunqing Gu, Junjun Zhang, Songwei Yu, Chengqi Mou, Zhou Li, Chendong He, Denghao Wu, Jiegang Mou, Yun Ren
Summary: In this study, the grid irrelevance and discrete error in hydrofoil unsteady cavitation simulations were investigated using the GCI evaluation method to determine the optimal number of grids. Various turbulent viscosity correction approaches were employed to improve the turbulence model, and numerical simulations successfully captured the details of the hydrofoil cavity shape and shedding process, revealing the mechanism of hydrofoil cavitation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Geochemistry & Geophysics
Famu Huang, Ziheng Zhu, Jian Wang, Ping Zhang, Zhongxin Ren, Jun Lu, Haibo Su, Hong Zhang, Jingbin Li
Summary: Investigating the impact of nozzle structure on energy conversion efficiency, this study designs a swirling multiorifice nozzle and verifies its effectiveness in field applications. The results show that the nozzle pressure drop and vorticity are primarily generated at the acute angle of the orifices. The number of forward orifices is directly proportional to energy loss, while the discharge coefficient and hydraulic performance initially increase and then decrease. The swirling multiorifice nozzle with fewer backward orifices achieves better rock-breaking results in the field.
Article
Engineering, Marine
N. N. Peng, K. W. Chow
Summary: In this study, a three-dimensional numerical wave tank based on OpenFOAM is developed to study the propagation and breaking of waves with a moderate wavelength. The optimal parameters of the numerical models for various wave regimes are investigated, and the accuracy and performance of the model are evaluated through various indicators. The study also explores turbulent flows and wave breaking, and validates the model through comparison with experimental data.
Article
Engineering, Civil
Weiren Zhang, Fan Yang, Siyuan Zhang, Yijie Bian, Peng Wang, S. A. Meguid
Summary: This paper presents a new multicellular design for effective energy absorption. Extensive experiments, simulations, and analysis were conducted to evaluate the performance of this design. The results show that a face centered square layout with an appropriately selected taper angle has excellent energy absorption and crashworthiness properties.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Biochemistry & Molecular Biology
Yangyang Cai, Dezhong Lv, Donghao Li, Jiaqi Yin, Yingying Ma, Ya Luo, Limei Fu, Na Ding, Yongsheng Li, Zhenwei Pan, Xia Li, Juan Xu
Summary: IEAtlas is a valuable resource for investigating the immunogenic capacity of non-canonical epitopes and their potential as therapeutic cancer vaccines.
NUCLEIC ACIDS RESEARCH
(2023)
Article
Medicine, Research & Experimental
Zan-Xiong Chen, Hong-Qian Liu, Zhen-Hua Wu, Jun-Lian He, Hao-Jie Zhong
Summary: This study found that the frequency of circulating ILC3s is elevated in patients with HUA and is positively correlated with serum uric acid and creatinine levels. Although there is no significant difference in plasma IL-17A concentration between HUA patients and healthy controls, positive correlations between plasma IL-17A and serum uric acid levels and circulating ILC3 frequency were observed in HUA patients.
ADVANCES IN CLINICAL AND EXPERIMENTAL MEDICINE
(2023)
Letter
Otorhinolaryngology
Thomas J. Lepley, Zhenxing Wu, Zachary T. Root, Barak M. Spector, Robbie J. Chapman, Aspen R. Schneller, Kathleen Kelly, Bradley A. Otto, Kai Zhao
INTERNATIONAL FORUM OF ALLERGY & RHINOLOGY
(2023)
Article
Rheumatology
Yang Hu, Rui-Chen Gao, Ni Sang, Li Wu, Pei-Li Shi, Guo-Cui Wu
Summary: Self-disclosure may enhance positive illness perceptions. Social support, drinking, and depression are influential factors for self-disclosure in patients with systemic lupus erythematosus (SLE). Self-disclosure is positively correlated with quality of life, except for physical health and fatigue.
Article
Chemistry, Physical
Guanghui Li, Fengman Liu, Shengyi Yang, Jiang-Tao Liu, Weimin Li, Zhenhua Wu
Summary: The micro-electromechanical-system (MEMS) force and acceleration sensor, based on the graphene-induced non-radiative transition, was investigated using analytical solution and finite element analysis methods. The sensor can detect the deflection of the graphene ribbon, applied force, and acceleration with high sensitivity. With its small size and ability to be charged by light irradiation, the MEMS sensor has significant application prospects in the fields of micro-smart devices, wearable devices, and biomedical systems.
Correction
Multidisciplinary Sciences
Robert. D. D. Bell, Ethan. A. A. Winkler, Itender Singh, Abhay. P. P. Sagare, Rashid Deane, Zhenhua Wu, David. M. M. Holtzman, Christer Betsholtz, Annika Armulik, Jan Sallstrom, Bradford. C. C. Berk, Berislav. V. V. Zlokovic
Article
Optics
Shaojie Chang, Zhenhua Wu, Diwei Liu, Renbin Zhong, Zhaoyun Duan, Yanyu Wei, Yubin Gong, Min Hu
Summary: In this study, we propose a novel approach to enhance the second harmonic of electron beams and increase the output power at higher frequencies. By using a planar grating for fundamental modulation and a transmission grating for harmonic coupling, the proposed structure achieves a high power output of the second harmonic signal. Computational investigations demonstrate that this configuration can generate a 0.202 THz signal with an output power of 4.59 W at an electron beam density of 50 A/cm2 and a voltage of 31.5 kV. The reduced current density in the G-band has significant implications for the advancement of terahertz vacuum devices.
Article
Optics
Yanli Xu, Shengyi Yang, Rong Li, Shanjin Lv, Zhenhua Wu, Jiangtao Liu
Summary: Most UV passive optics lack tunability and external modulation methods due to poor tunability of wide-bandgap semiconductor materials in UV working media. This study explores the excitation of magnetic dipole resonances in the solar-blind UV region using hafnium oxide metasurfaces and elastic dielectric polydimethylsiloxane (PDMS). The near-field interactions between the resonant dielectric elements can be modulated by mechanical strain of the PDMS substrate, enabling the flattening of resonant peak beyond the solar-blind UV wavelength range and switching on or off the optical switch in the solar-blind UV region. The device offers a simple design and can be applied in UV polarization modulation, optical communications, and spectroscopy.
Article
Plant Sciences
Zhenhua Wu, Yunpeng Bai, Yujuan Qi, Chao Chang, Yan Jiao, Yaobang Bai, Zhigang Guo
Summary: This study found that metformin has a protective effect against ferroptosis in cardiac ischemia and reperfusion (I/R) injury.
PHARMACEUTICAL BIOLOGY
(2023)
Article
Plant Sciences
Xiangling Wang, Baiquan Song, Zhenzhen Wu, Xiaoyu Zhao, Xin Song, Muhammad Faheem Adil, Muhammad Riaz, Milan Kumar Lal, Wengong Huang
Summary: The study focuses on understanding the physiological and molecular mechanisms underlying the tolerance of sugar beet varieties to boron deficiency. The results show that B-efficient varieties are able to absorb and utilize sufficient boron through the up-regulation of specific genes and the activation of antioxidant enzyme systems, thereby maintaining a superior cellular structure and promoting root development.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2023)
Review
Nanoscience & Nanotechnology
Yuhui Tian, Daijie Deng, Li Xu, Meng Li, Hao Chen, Zhenzhen Wu, Shanqing Zhang
Summary: A sustainable and cost-effective production of H2O2 via electrochemical oxygen reduction reaction is highly desired for various applications. Significant progress has been made in catalyst design and innovative cell designs for electrocatalytic production of H2O2. This review summarizes recent advances, including mechanistic explorations, theoretical computations, experimental evaluations, and perspectives on addressing remaining challenges.
NANO-MICRO LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Mengting Zheng, Juncheng Wang, Shangshu Qian, Qiang Sun, Hao Chen, Liang Zhang, Zhenzhen Wu, Shanqing Zhang, Tiefeng Liu
Summary: A one-step water-based recycling process is proposed to recycle and regenerate graphite anode materials from spent lithium-ion batteries (LIBs). The regenerated graphite with expanded interlayer spacing and oxygen-containing groups exhibits excellent performance in graphite dual-ion batteries (GDIBs). This waste-to-resource strategy provides a low-cost and sustainable recycling pathway for spent LIBs and enables the sustainable manufacturing of GDIBs.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Plant Sciences
Xiaopei Wu, Lu Zhang, Xiuyun Wang, Rengang Zhang, Guihua Jin, Yanting Hu, Hong Yang, Zhenzhen Wu, Yongpeng Ma, Chengjun Zhang, Jihua Wang
Summary: Researchers have constructed chromosome-scale genome assemblies for two species of Rhododendron and conducted phylogenetic and whole-genome duplication analyses. They have also investigated gene duplication and gene family expansion, as well as conducted evolutionary analysis of specific genes involved in secondary metabolite biosynthesis and stress response. The results provide important genetic resources for molecular breeding and genetic improvement of economically important plants in the Rhododendron genus.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Agronomy
Xiaoyu Zhao, Baiquan Song, Muhammad Ishfaq, Muhammad Faheem Adil, Milan Kumar Lal, Zhenzhen Wu, Qiue Jia, Wengong Huang
Summary: The application of zinc fertilizer has a significant impact on the yield and quality of sugar beet roots in black and albic soils in Northeast China. The addition of 30 kg/ha of zinc fertilizer can increase the dry matter accumulation, sugar content, and sugar yield of sugar beet roots. These findings have important implications for nutrient management in sugar beet planting and the sustainable development of the sugar industry.
FIELD CROPS RESEARCH
(2023)