bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical simulation and thrust performance optimization of water jet thruster
Authors: Lou Yuan , Peng Guangjie , Chang Hao 
Published: March 2024

Abstract
With the increasing use of water jet thrusters on ships, the demand for increasing their thrust performance and efficiency is also increasing. The impeller, as the core power component, is the key to the thrust of the water jet thruster. Therefore, to obtain a more energy-saving, low-carbon, and higher-thrust water jet thruster, this paper conducts an in-depth study on the impeller of the water jet thruster. The hexahedral grid is used to divide the internal flow field of the water jet thruster into structured grids, and the RANS equation and k-ε turbulence model are used to simulate the hydraulic performance of the original model, and then the blade of the impeller is optimized. Finally, compared with the original model, the simulation results of the optimization model show that the efficiency is increased by 4.8 %, and the thrust at the highest efficiency point is increased from 614 N to 1623 N. The optimized model greatly improves the efficiency and thrust of the water jet thruster, and the optimization effect is obvious.
Vibration isolation characteristics of a rubber isolator in the deep water condition
Authors: Yang Danyi , Xue Lei , An Yvchen , Liu Jing 
Published: March 2024

Abstract
In order to explore the effect of the deep water condition on the vibration isolation performance of rubber isolators, a finite element model of shipboard rubber vibration isolator with different depths which considers the nonlinear material properties of rubber is established. The nonlinear properties of rubber materials are characterized by the Mooney-Rivlin hyper-elasticity model. Hydrostatic pressure is applied on the surface of the isolator in the form of pre-stress to simulate deep water conditions. The static and dynamic mechanical characteristics of the rubber isolator under deep water environment are obtained. The results show that the static stiffness of vibration isolator increases with the water depth, especially when the rubber hardness is high. The natural frequency of the isolator under deep water environment increases with the water depth. The transmission loss of rubber isolators under deep water environment significantly reduces due to the change of static stiffness. The results can provide technical support for the design and optimization of underwater vibration isolators.
Simulation analysis of bubble coalescence behavior characteristics in Newtonian fluids based on the phase field method
Authors: Long Li 
Published: March 2024

Abstract
Gas-liquid two-phase flow is widely used in various fields of chemical production because of its stability. The bubble coalescence behavior significantly impacts bubbles’ size, shape, and movement. These parameters are essential for interphase mass, heat transfer processes, and equipment performance. This paper presents a simulation study of the bubble coalescence behavior of Newtonian fluids using the phase field method through simulation software. The relative location of bubbles were divided into three types: vertical, parallel and random; and also the distribution of bubbles can be divided into three cases: symmetric, left-skewed and right-skewed. This paper focuses on the influence of the arrangements of the bubbles on their coalescence behavior in Newtonian fluids. The results show that the relative distance of bubbles is the crucial factor for the occurrence of bubble coalescence in Newtonian fluids, and different distributions show different laws on the motion of bubbles.
Thermal elastohydrodynamic lubrication analysis of the oil film temperature in tapered roller bearings
Authors: Yu Tao , Shen Wenhao , Xu Chunhui , Liu Quanzhong 
Published: March 2024

Abstract
Tapered roller bearings often experience thermal deformation and stress concentration due to high temperature during prolonged operation. However, the traditional model for calculating bearing heat does not consider the thermal elastohydrodynamic behavior of the lubricant. To address this issue, this paper proposes a finite line contact model based on thermal elastohydrodynamic lubrication analysis for calculating the temperature distribution of the lubricant within tapered roller bearings. The temperature of the lubricant is solved using the column-by-column technique. The results show that the temperature distributions along the thickness of the oil film are symmetrical, with the highest temperature occurring at the middle layer. Furthermore, the temperature at the middle layer increases with both the bearing speed and the concentrated load. These findings provide a theoretical framework for calculating the temperature distribution of lubricated bearings, offering valuable insights for practical applications.
Study on microchannel cavitation phenomena based on experiment and simulation
Authors: Meng W J , Lei C , Su W T , Li B 
Published: March 2024

Abstract
Cavitation phenomenon is a common fluid mechanics phenomenon. Its special flow limiting structure generates abundant microchannel cavitation in the microchannel, and the existence of these cavitation flow field with complex flow field structure characteristics is formed in the microchannel. In order to better understand the cavitation phenomenon in the microchannel, this paper takes the microchannel as the research object, adopts the method of comparison between experimental research and numerical simulation, changes the cavitation number by adjusting parameters, and analyses the cavitation phenomenon of the microchannel under different working conditions. From the experimental point of view, a micro-channel with rectangular current limiting structure was designed. In order to observe and analyse the microchannel hydraulic cavitation phenomenon, the hydraulic cavitation micro-channel experiment platform was designed and built, which could analyse the cavitation flow pattern of the microchannel. The computational fluid dynamics simulation software Fluent was used to simulate and study the microchannel cavitation phenomenon characteristics by changing the boundary conditions. It is found that the cavitation phenomenon becomes more obvious as the number of cavitations decreases. Finally, the simulation results are compared with the experimental results, and the simulated cavitation flow pattern is in good agreement with the experimental results.
Analysis of the influence of venturi structural parameters on the performance of hydraulic impactors
Authors: Hou Lingxia , Feng Ding , Wang Jiangang , Zhang Yiduo , Hou Xuewen 
Published: March 2024

Abstract
The venturi effect can be used to control the fluid pressure at different locations in the pipe, and the pressure difference generated based on this principle can push the piston inside the hydraulic impactor up and down to impact the drilling tool, thus expanding the use of coiled tubing and improving the efficiency of drilling. In this paper, the effects of several different necking sizes, tapering angles and diffusion angles on the flow field state and pressure control performance inside the venturi are studied, and the influence laws are analyzed by using Fluent finite element software, and the effects are verified by numerical simulation. The related research have a great significance to the selection of venturi structure size, and it also provides the theoretical basis for the optimization of the structure parameters of the hydraulic impactor.
An Eulerian-Eulerian CFD modeling analysis of gas-liquid flow under elevated pressure
Authors: Gao Yibo , Geng Linlin , Zhang Desheng 
Published: March 2024

Abstract
In this study, a newly proposed pressure correction method coupled with DBS drag force model was used to simulate the gas-liquid flow in a bubble column, which combines Eulerian-Eulerian approach to simulate gas-liquid flow under elevated pressure conditions. This further verifies the accuracy of the model and expands its application range. The gas holdup and velocity distributions of different models were compared, and the performance of the new model was similar to that of Yan et al., while the model of Tran et al. was not sensitive to the influence of the pressure in this study. It was found that the drag model using the new pressure correction method showed the best consistency.
Investigations on cavitation suppression of bionic water-jet impeller
Authors: Wang J Q , Wan C R , Zhou M , Wang Z L , Yang M Z 
Published: March 2024

Abstract
Bionic impeller blades can improve cavitation performance of waterjets. A Special kind of bionic impeller with non-smooth leading edge is designed to improve the NPSH (net positive suction head) performance of waterjets. Based on the cavitation experiment of the waterjet with original impeller, a reliable CFD method using the commercial software StarCCM+ is verified. The detailed flow field of the bionic blades is obtained by simulating the viscous flow field. The stream line, pressure distribution and vortex reveal the mechanism of bionic blades flow adjustment. The influence of bionic impeller factors, which are the amplitude, the interval and the phase, on cavitation performance is systematically studied. The area and volume of the blade cavitation pattern is used to characterize the blade cavitation performance. An efficient method of cavitation pattern recognition is proposed to determine the information of the blade cavitation pattern accurately. A feasible cavitation-adjustment method is proposed to improve the hydraulic performance by optimizing the cavitation distribution and strength.
Structure design on a new type of coupled impactor
Authors: Qiaolei Sun , Le Xia , Yuwei Liu , Long Deng 
Published: March 2024

Abstract
Improving drilling efficiency and reducing drilling cost are new challenges for deep drilling. Based on this, a coupling impactor is designed by applying the principle of hydraulic pulse pressurization and axial impact. Based on the impactor compression structure and principle, the fluid flow equation of the drilling fluid flowing through the compression mechanism and the mechanical balance equation of the piston body are established in order to study the pressure pulsation characteristics of the coupled impactor fluid.
Study on the Effect of SiO2 Content on the Properties of Epoxy Resin
Authors: Zhou Jiang , He Mingpeng , Zhang Yue , Huang Huixin , Yuan Yuan 
Published: March 2024

Abstract
With the development of energy layout in western China, the construction and operation of hydro-generator units in high-altitude and cold regions such as Tibet and Qinghai have increased rapidly, which puts forward stricter requirements for the insulation and anti-corona technology of high-altitude units. Improving the intrinsic properties of the matrix material is a highly efficient anti-corona method. In the paper, epoxy resin composites doped with different contents of micron silica were prepared. The effects of 0.5 wt%, 1 wt%, and 1.5 wt% SiO2 on the thermal conductivity, dielectric properties, and breakdown field strength of the matrix resin were researched. The results in this paper show that the doping of different contents of SiO2 has little effect on the thermal conductivity of the matrix resin, but improves the dielectric properties of the matrix resin to a certain extent. With the increase of SiO2 content, the breakdown field strength of the composites increased primarily and then decreased.
Adsorption performance of cellulose/chitosan microspheres for congo red
Authors: Du Yuanyuan , Fu Ying , Wang Ruixue , Dai Yanan , Zhang Kaili , Gao Xing 
Published: March 2024

Abstract
Cellulose is abundant in nature, and it has good biocompatibility and biodegradability. However, it has shortcomings such as insufficient ductility, poor solubility, and difficult in forming, which limits its further application in many fields, such as food and medicine. Cellulose/chitosan composite microspheres were prepared using carboxymethyl cellulose and chitosan as raw materials, anhydrous ethanol, and distilled water as coagulants by the crosslinking method. Fourier infrared spectroscopy (FT-IR), specific surface area and aperture test (BET), and scanning electron microscopy (SEM) were used to characterize the adsorption properties. The results showed that the adsorption rate of cellulose/chitosan was higher than that of a single substance. The maximum adsorption capacity of the cellulose/chitosan composite microsphere was 57.63 mg/g when the equilibrium was reached. Compared with single cellulose and chitosan, cellulose/chitosan composite microspheres had a better adsorption effect on Congo red. As a potential adsorption material, this material has shown good application value in the field of sewage treatment.
Study on the efficient selective oil absorption and recovery of hydrophobic chitosan aerogels
Authors: Liang Zeyi , Wang Yifei , Xu Jiangtao , Chen Kuiyong , Liu Yue 
Published: March 2024

Abstract
Chitosan (CS) aerogels were prepared by an ice templating method and their surfaces were then coated with reduced graphene oxide to form modified biodegradable CS (MCS) aerogels. The MCS aerogels retained the porous CS structure after modification. Based on the characteristics of high porosity and hydrophobicity, the MCS aerogels exhibited a highly selective absorption ability of oils from water. The oil absorption capacity of MCS aerogels could achieve 92.63 g g−1 for chloroform. In addition, the compressive strength of the MCS aerogels increases after modification, so they are recyclable. Therefore, the MCS aerogels could be a kind of green, biodegradable, efficient, and cost-effective absorbent for spilled oils.
Study on strength and toughness of FeCoCrNiAlx high entropy alloy
Authors: Ma Yuyang , Zhao Hui 
Published: March 2024

Abstract
This experiment analyzes the effects of Al content on the microstructure and mechanical properties of FeCoCrNiAlx high entropy alloy. We can observe that the high entropy alloy is FCC single-phase structure when the Al element content is low[1]. With the Al content increases, the alloy structure gradually changed from the FCC phase to a new phase composed of the FCC phase and BCC/B2 phase, and finally into the BBC single phase. The difficult element diffusion phenomenon and high entropy effect make the alloy form a simple solid solution structure. With the precipitation of the second phase, the properties of the alloy are strengthened[2]. After the Al element is gradually added to the alloy, the grain structure is refined, and fine crystal strengthening occurs. The experiment results show that with the increase of Al content, the mechanical properties of the alloy are significantly improved, and the tensile strength is increased from 358 MPa to 1265 MPa. Yield strength increased from 166 MPa to 878 MPa. Hardness increased from 1.4 Gpa to 4.22 Gpa. However, the fracture elongation of the alloy decreased from 51.3% to 12.2%.
Study on the influence of different molecular structure concrete slump retaining agents under high temperature
Authors: Guan Mengqin 
Published: March 2024

Abstract
In this paper, the free radical polymerization method was used to design different molecular structures of polycarboxylate slump-preserving agents. The effects of different functional monomers, acid-to-ether ratio, ester density, side chain length, and other factors on the dispersion and slump-retaining properties of concrete under high temperatures were compared and analyzed. The optimal process of high-temperature resistance was screened, before and after the alkali hydrolysis treatment, and the dispersing and retention performance of the slump-retaining agent was tested. The high-temperature slump-preserving agent was verified by gel chromatography and an infrared spectrum analyzer, which provided technical support for solving the rapid collapse of concrete in a high-temperature environment in summer.
Effect of heat treatment on the microstructure and mechanical properties of yttrium metal
Authors: Wang Shuang , Zhong Jiamin , Li Shuan , Zhang Xiaowei , Wang Zhiqiang , Yang Hongbo , Wu Daogao 
Published: March 2024

Abstract
Rare earth oxides prepared by magnetron sputtering of rare earth metal targets are ideal high k gate dielectric materials. The production of targets has drawn more and more attention. In this work, the yttrium (Y) metal target is subjected to cold rolling, resulting in an accumulated deformation of 40%. Subsequently, the deformed Y was heat-treated at various temperatures. Microstructural and mechanical characteristics of Y subjected to deformation and heat treatment were systematically examined utilizing an electron backscatter diffractometer and a hardness tester. The main coarse grains of rolled Y metal were replaced by fine grains with heat treatment temperatures of 550, 650, and 750 °C. Heat treated at 750 °C, grain size distribution was quite homogeneous and the grain growth was not obvious. As for recovery and recrystallization processes, the recovery process occurred after 450-°C heat treatment. And the recrystallized process is fully completed at 750 °C. Besides, the High-Angle Grain Boundaries (HAGB) fraction increased with a rise in heat treatment temperatures from 550 to 750 °C. The microhardness decreased with the heat treatment temperatures increased until 650 °C, then remained stable. This work can provide an important reference for the optimal heat treatment temperature of Y target materials.
First-principle calculations of sulfur dioxide adsorption on the palygorskite
Authors: Jia Weimin , Wang Yanbin , Ren Fang , Zhao Jinqin , Su Qiong , Lu Zhibin , Liang Junxi 
Published: March 2024

Abstract
This study uses the density functional theory (DFT) method of first-principle to provide theoretical guidance for a deeper understanding of the adsorption performance of palygorskite (PAL). An analysis was conducted to determine the optimal surface configurations and binding sites for SO2 on the PAL (100) surface. The results show that for the SO2/PAL adsorption system, the adsorption energies (-0.13 and -0.10 eV) and charge transfer amounts (0.017 and 0.029 e) at the top and bridge sites are greater than those at the hollow site (0.55 eV and 0.015 e), which determine the steadiest adsorption sites. Moreover, the fermi level is altered by orbitals in SO2, revealing interactions between SO2 and the (100) surface of PAL.
Surface morphology change in DLC: H coatings with gradient Cr under high temperature and high pressure
Authors: Ni Xinhua , Liu Qiongxi , Yu Jinfeng 
Published: March 2024

Abstract
The pressure influence of the surface morphology of DLC: H Coatings with gradient Cr (DCr) was studied by annealing in argon (HT effect) and HIPping (HT/HP effect). The results show that the voids formed on the HIPping annealed surface are rose-shaped with multi-layered edges but the edge of the voids formed on the argon annealed surface looks single-layered, and the composition of the coating surface is the same after HIPping and argon annealing. The Cr content at the bottom of the voids is higher in the HIPped surface than the argon annealed surface, and the voids formed in the HIPping annealed are relatively smaller but deeper than those in the argon. It is reasonable to deduce that the hydrogen release could have been restricted by the applied high compressive pressure on the surface.
Study on preparation technology of molybdenum-tungsten alloy with different tungsten content
Authors: Xi Sha , Zhu Qi , Chen Cheng , Wang Na , Zhou Sha , Yao Cheng , Zhang Xiao 
Published: March 2024

Abstract
The molybdenum-tungsten alloy rods with different tungsten content are prepared by powder metallurgy. The effects of different sintering processes on the density and microstructure of alloy rods are studied. The effects of different spinning forging processes on the yield and mass loss rate of alloy bars are also discussed. The results show that the optimum sintering processes of Mo-20W and Mo-50W alloys are 2150°C, 8 h, and 2200°C, 8 h respectively. Under the optimum sintering process, the relative density of the alloy rod reaches more than 98%. The microstructure is uniform and fine, and the grain of molybdenum tungsten alloy decreases gradually with the increase of W content. The optimum spinning forging processes of Mo-20W and Mo-50W alloys are 1280~1360°C and 1440~1520°C respectively. Under the optimum spinning forging processes, the yield of alloy bars reaches more than 92%, and the mass loss rate is reduced to 1.05~1.10%.
Denoising of laser cladding crack acoustic emission signals based on wavelet thresholding method.
Authors: Yang Hengliang , Zhang Jingli , Chen Jiaxin , Cai Hui , Jiao Yang , Wang Ming , Liu Eryong , Li Bo 
Published: March 2024

Abstract
Due to the influence of thermal stress and other factors during laser cladding, cracks will appear in the cladding layer. To reduce cladding loss, an effective method is to detect cracks early and adjust fusion parameters promptly. The paper utilized acoustic signal detection technology to collect crack defect signals during the laser cladding process. Subsequently, the collected acoustic signals were subjected to time-frequency analysis and wavelet thresholding denoising. Then by applying a custom thresholding approach for each level of wavelet coefficients, the crack signals were denoised. The results showed that this method achieved better denoising effects compared to other signal denoising methods and preserved the crack information to a greater extent, confirming the feasibility of the custom thresholding denoising approach. It helps to achieve online detection and acoustic signal analysis of cracks during the cladding process.
The study of the convergence conditions of the deep-learning method in the Li10GeP2S12 solid state electrolyte system
Authors: Peng Jie , Wang Liping 
Published: March 2024

Abstract
The ionic conductivity of solid-state electrolytes at room temperature is crucial for commercializing lithium-ion batteries with solid-state electrolytes. Ab initio methods encounter a challenge due to their substantial computational resource demands. Classical molecular dynamics methods, on the other hand, are suitable for large-scale systems with simulation times reaching the nanosecond scale. However, they rely on empirical parameters in force fields, limiting their use to systems with well-established and extensively validated parameters, which is a constraint in studying new materials. A simulation approach combines ab initio simulations and classical molecular dynamics. Deepmd-kit, a deep learning tool, trains a tailored force field model using ab initio simulation data for the target system. However, as an approximate method, its reliability must be compared with ab initio results. As a data-sensitive method, the amount of data required to achieve the desired accuracy varies for different systems and must be tested accordingly. This paper performs convergence training for system size and simulation time concerning Li10GeP2S12 solid-state electrolytes, establishing the convergence criteria for deep learning data in this system.
Study on the Preparation of a Polydiethylene Phenyl Phosphate Resin and its Adsorption of Cu2+ in Wastewater
Authors: Liu Ke , Liang Qiansheng , Li Yongsheng 
Published: March 2024

Abstract
In view of the problems and imperfections in the synthesis of phosphoric acid resins by existing techniques, we prepared a different phosphoric acid resin and used it to adsorb Cu2+ in wastewater. When phosphoric acid resin is prepared using cross-linked polydiethylbenzene resin as a matrix, the experimental raw material can be more selective and the experimental process is safe and non-toxic. The particle size of the synthesized resin is uniform, most of which are distributed in 100-300 μm, and the functional group content can be as high as 2.4 mmol/g. The static/dynamic adsorption on Cu2+ is excellent, with a static adsorption capacity of 51.2 mg/g. When hydrochloric acid is used as an eluant, the resin has favorable reproducibility, which provides a reference value for the preparation and application of phosphate resins.