Article
Chemistry, Physical
Shuangmei Zhou, Xiaohan Jia, Huimin Yan, Xueyuan Peng
Summary: The primary disadvantage of Roots pumps in hydrogen fuel cell vehicles is low flow rate. A novel profile was developed in this paper to increase working volume and reduce internal leakage, with approximately 10.4% higher area utilization than traditional profile. Numerical results demonstrated the proposed profile's superiority in high flow rate and sealing.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Environmental Sciences
Lei Li, Dandan Yan, Xuyang Liu, Weiqiang Zhao, Yupeng Wang, Jiayang Pang, Zhengwei Wang
Summary: The study found that the pressure and velocity changes in the pump clearance mainly occur at the seal of the labyrinth ring, and the pressure balance pipe also affects the water pressure and flow through the clearance. Increasing the clearance thickness will cause changes in the pressure values at various parts of the runner, and increasing the crown clearance will affect the axial water thrust.
Article
Engineering, Mechanical
Guipeng Wang, Guoxin Chen, Yun Shan, Yu Wang, Yuanhua Xie, Yaoshuai Ba, Dechun Ba, Kun Liu
Summary: This study analyzed the pumping performance and power consumption of different rotors in different pressure ranges through experiments and numerical simulations. The results showed that two-lobe and three-lobe Roots rotors are more suitable for the low-pressure range, while five-lobe Roots rotors are suitable for the high-pressure range. The research findings provide a reference for the design of the rotor combination scheme of multi-stage Roots dry vacuum pumps.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Energy & Fuels
Larissa Oliveira Pereira de Carvalho, Denisson Santos, Joao Paulo Lobo dos Santos
Summary: In this study, the effects of water cut, viscosity, and clearance on fluid slippage and pump efficiency in sucker rod pumping technique were investigated using rheological analysis and software simulation. The results showed that clearance was the most influential parameter, and reducing clearance could optimize pump efficiency for fluids with low viscosity.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Biomedical
Zhengwei Li, William C. Balance, Md Saddam Hossain Joy, Shrey Patel, Joanne Hwang, Hyunjoon Kong, M. Taher A. Saif
Summary: This article introduces an adaptive, autonomous biohybrid pumping machine powered by engineered living muscles. Through the complex interactions between living cells and engineered scaffolds, a self-assembled biohybrid system is achieved, which is capable of adaptively managing its pumping performance based on the cues received from the generated flow in the feedback loop. This development may have significant utility and impact in the fields of health, medicine, and bioengineering.
Article
Engineering, Chemical
Shengqiang Jiang, Zehua He, Yupeng Zhou, Xiangwu Xiao, Guodong Cao, Zhenggang Tong
Summary: In this paper, a numerical model of the suction process of the pumping system was established and its accuracy was verified. The distribution characteristics of the internal flow field of the hopper and the change law of the bubble shape in the fresh concrete during the suction process were explored. The research results provide valuable references for improving the hopper structure and optimizing the operational parameters of the suction process of the pumping system.
Article
Energy & Fuels
Paulina Szwemin, Wieslaw Fiebig
Summary: The design of gear pumps and motors focuses on creating more efficient units using advanced numerical simulation techniques. Despite the simple design of gear pumps, the fluid flow inside is complex. Simulation studies and a CFD model were used to investigate leakages and fluid flow phenomena, providing a detailed analysis of the impact of gears' eccentricity on leakages and pressure build-up.
Article
Engineering, Marine
Ruyu Li, Xiaoni Wu, Jinjian Chen
Summary: A new method using solidified slurry for monopile foundation scour countermeasure has been proposed recently. This study focuses on the residual rate of fluidized solidified slurry during the pumping operation and investigates the effects of pumping location, current velocity, pumping velocity, and material property of solidified slurry on the residual rate through numerical simulations. The findings provide important insights for understanding the residual rate of solidified slurry in the application of scour protection for monopile.
Article
Instruments & Instrumentation
Dai-Hua Wang, Yun-Hao Peng, Lian-Kai Tang, Huai-Qiang Yu
Summary: A new structure of multi-chamber piezoelectric pump with double CPUAs and active piezoelectric valves was proposed to achieve high control accuracy and bidirectional fluid pumping. Numerical simulation and experimental tests validated the effectiveness of the structure in improving flow rate and output pressure of the pump.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Chemical
Yi'nan Qian, Yuanshun Wang, Zhenlong Fang, Xiuhan Chen, Sape A. Miedema
Summary: The study found that as the flow ratio increases, the pressure ratio of the jet pump decreases, while the efficiency shows a parabolic distribution. Properly increasing the length of the mixing chamber can improve the pressure ratio and broaden the available efficiency.
Article
Engineering, Marine
Houlin Liu, Jiawei Lin, Runan Hua, Liang Dong
Summary: This paper proposes an optimization design method for a muffler structure in order to eliminate noise in the pumping system and prolong the equipment's service life. By designing a water guide cone inside the muffler and adopting a porous structure for the muffler shell, water guide cone wall surface, and circular bottom plate, the best sound suppression effect of the muffler structure is achieved. The effects of different channel expansion angles and flow areas on the muffler's performance are also studied, and the results show that a flow channel expansion angle of 145 degrees and a flow area ratio of 3 times provide the best noise elimination performance for the muffler. The structural optimization of the muffler studied in this paper is of great significance for noise reduction in the pumping system.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Victor X. Mendoza-Escamilla, Gabriela Rivadeneyra-Romero, Helvio Mollinedo, Juan Antonio Yanez-Varela, Israel Gonzalez-Neria, Alejandro Alonzo-Garcia, Sergio Alejandro Martinez-Delgadillo
Summary: In this study, the hydrodynamic performance of a modified PBT turbine with added flanges on the leading edges was investigated. The flanges were found to delay flow separation, reduce recirculating regions, and improve pressurization on the rear blade surfaces, leading to a decrease in power consumption. Furthermore, the redirection of flow energy by the flanges resulted in improved pumping efficiency and shorter mixing time. The highest power reduction achieved with the flange models was 12.5%, while the highest increase in pumping was 6.4%. The modified profiles also demonstrated a maximum increase in pumping efficiency of 31.3% and a maximum decrease in mixing time of 11.2%.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Mechanical
Luiz Henrique Lindquist Whitacker, Jesuino Takachi Tomita, Cleverson Bringhenti
Summary: The study compared the performance of turbopumps under single-phase and multiphase flow conditions, finding that tip clearance has a significant impact on both machine performance and internal flow field, with efficiency decreasing as the gap increases.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Thermodynamics
Kan Kan, Qingying Zhang, Zhe Xu, Yuan Zheng, Qiang Gao, Lian Shen
Summary: The study found that tip leakage flow (TLF) and the associated tip leakage vortex (TLV) can affect the performance of PAT, decreasing hydraulic efficiency, increasing flow rate, and affecting shaft power output. The effect of TLF on the pressure distribution along the blade depends on flow conditions, while the form of TLV is influenced by the flow incidence angle.
Article
Engineering, Multidisciplinary
Xiaosheng Chen, Zhenlin Chen, Zhenzhen Gui, Fan Zhang, Weirong Zhang, Xiaosi Zhou, Xi Huang, Jianhui Zhang
Summary: A highly integrated valve-less piezoelectric micropump for generating recirculating flow was proposed, utilizing a novel double-loop tube design and piezoelectric-actuated chamber. Experimental results demonstrated the system's capability to generate internal recirculating flow and pump effect, with flow rate and output pressure affected by characteristic length of the cross section and vibrator amplitude.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.
