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Impact–sliding fretting tribocorrosion behavior of 316L stainless steel in solution with different halide concentrations

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摩擦:英文版 2023年第12期11卷 2310-2328页

作者： Xu MA Wei TAN Remy BONZOM Xue MI guorui zhu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Zhejiang Institute of Tianjin University Ningbo 315201China Electricitéde France R&D Materials and Mechanics of Components DepartmentMoret sur Loing 77818France Nuclear Power Institute of China Chengdu 610044China

Impact–sliding caused by random vibrations between tubes and supports can affect the operation of heat exchangers.In addition,a corrosive environment can cause damage,accelerating the synergism of corrosion and wear.Therefore,the focus of this work was the impact–sliding fretting tribocorrosion behavior of 316L heat exchanger tubes at different halide concentrations.A device system incorporating the in situ electrochemical measurements of impact–sliding fretting corrosion wear was constructed,and experiments on 316L heat exchanger tubes in sodium chloride(NaCl)solution with different concentrations(0.0,0.1,0.5,1.0,3.5,and 5.0 wt%)were carried out.The synergism between wear and corrosion was also calculated and analyzed.The wear and damage mechanisms were elucidated by correlating the corrosion–wear synergism,morphologies,and material loss rates.The results indicated that the stable wear stage occurred at approximately 9–12 h,after which the corrosion current increased with the expansion of the wear area.As the halide concentration increased,the scale of damage on the wear scars gradually decreased,changing from being dominated by cracks,delaminations,and grooves to being dominated by scratches,microgrooves,and holes.There was an obvious positive synergism between wear and corrosion.The material loss was dominated by pure mechanical wear and wear enhanced by corrosion,but corrosion enhanced by wear contributed more than tangential sliding fretting corrosion.The total mass loss increased gradually in the range of 0.0–0.5 wt%and decreased in the range of 0.5–5.0 wt%.Large-scale damage enhanced by corrosivity and small-scale damage reduced by lubricity dominated the material loss at low and high concentrations,respectively.

关键词： impact-sliding fretting wear tribocorrosion halide concentration 316L stainless steel

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A boronic acid conjugation integrates antitumor drugs into albumin-binding prodrugs-based nanoparticles with robust efficiency for cancer therapy

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Nano Research 2023年第5期16卷 7422-7430页

作者： Weiyue Ban Qiuhua Luo Chengda Yan Xiaoying Fan guorui zhu Maosheng Cheng Zhonggui He Mengchi Sun Jin Sun Department of Pharmaceutics Wuya College of InnovationShenyang Pharmaceutical UniversityShenyang 110016China Department of Pharmacy The First Hospital of China Medical UniversityShenyang 110001China Phase I Clinical Trials Center The First Hospital of China Medical UniversityShenyang 110102China Key Laboratory of Structure-Based Drug Design and Discovery Ministry of EducationShenyang Pharmaceutical UniversityShenyang 110016China School of Pharmacy Shenyang Pharmaceutical UniversityShenyang 110016China

Despite great therapeutic effect of Abraxane®,complex preparation technology and unfavorable pharmacokinetics still restricted the clinical application of albumin-based paclitaxel(PTX)nanoparticles(NPs).Herein,we reported that an albumin-binding prodrug,phenylboronic acid-conjugated PTX(P-PTX),can form the uniform NPs with the diameters around 100 nm with the help of albumin via simple one-step nano-precipitation method.The albumin-based nanomedicines were stabilized by the integration of a single boronic acid with PTX due to the increased affinity based on multiple intermolecular interactions.We found that albumin-based P-PTX NPs exhibited superior colloidal stability over albumin-based PTX NPs through one-step nanoprecipitation approach,achieving longer in vivo circulation time and higher concentration in tumor than those of the marketed Abraxane®.Furthermore,the albumin-based P-PTX NPs with great stability and enhanced intratumoral enrichment,increased the maximum tolerated dose of PTX,remarkably suppressed the growth of breast tumor and lung metastasis,prolonged survival of melanoma tumors-bearing mice.Such a convenient and effective system gains an insight into the impact of phenylboronic acid group on the albumin-based PTX NPs,provides potent strategy for the rational design of albumin-based antitumor nanomedicines.

关键词： drug delivery Abraxane® albumin-based paclitaxel nanoparticles phenylboronic acid group antitumor nanomedicines

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Influence of Na^+,K^+,Mg^(2+),Ca^(2+),and Fe^(3+) on filterability and settleability of drilling sludge

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Chinese Journal of Chemical Engineering 2017年第5期25卷 658-664页

作者： Liyan Liu Hao Yan Wei Tan guorui zhu School of Chemical Engineering and Technology Tianjin University

Solid–liquid separation is a vital step in drilling sludge disposal, and the filterability and settleability of drilling sludge are the main evaluating indicators for the separation process. The influence of Na^+,K^+,Mg^(2+),Ca^(2+),and Fe^(3+) on drilling sludge filterability and settleability was investigated in our research. The water content,filtration rate, supernatant volume and supernatant turbidity were measured to evaluate the filterability and settleability of drilling sludge. Meanwhile, the zeta potential, specific surface area of sludge flocs, particle size distribution and Fourier-transformed infrared spectra were employed to clarify the influencing mechanism.The experimental results showed that the filterability and settleability of drilling sludge were related to concentration and types of cations. Mg^(2+),Ca^(2+),and Fe^(3+) performed better than Na^+, K^+, and the cations with smaller hydrated radius got superior solid–liquid separation behavior at same valence. Finally, the spectra indicated that no chemical adsorption occurred between inorganic cations and drilling sludge flocs. The variation of surface charge and flocs growth after adding different inorganic cations were the reasons for the changes of the filterability and settleability.

关键词：污泥沉降性能过滤性能钻井 Fe Ca 傅里叶变换红外光谱无机阳离子 Zeta电位

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Investigation of the Vibration Behavior of Fluidelastic Instability in Closely Packed Square Tube Arrays

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Transactions of Tianjin University 2019年第2期25卷 124-142页

作者： Wei Tan Hao Wu guorui zhu School of Chemical Engineering and Technology Tianjin University National Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University

Flow-induced vibrations in heat exchanger tubes have led to numerous accidents and economic losses in the past. Fluidelastic instability is the most critical flow-induced vibration mechanism in heat exchangers. Both experimental and computational studies conducted to determine fluidelastic instability were presented in this paper. In the experiment, a water channel was built, and a closely packed normal square tube array with a pitch-to-diameter ratio of 1.28 was tested, and significant fluidelastic instability was observed. A numerical model adopting large-eddy simulation and moving mesh was established using ANSYS CFX, and results showed good agreement with the experimental findings. The vibration behaviors of fluidelastic instability were discussed, and results showed that the dominant vibration direction of the tubes changed from streamwise to transverse beyond a critical velocity. A 180° phase lag between adjacent tubes was observed in both the experiment and simulations. Normal and rotated square array cases with pitch-to-diameter ratios of 1.28 and 1.5 were also simulated. The results of this study provide better insights into the vibration characteristics of a square tube array and will help improve the fundamental research and safety design of heat exchangers.

关键词： Fluidelastic instability Dominant vibration direction Phase lag Square tube array Heat exchanger

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Suppression of methane/air explosion by water mist with potassium halide additives driven by CO2

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2742-2748页

作者： Wei Tan Dong Lü Liyan Liu guorui zhu Nan Jiang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300354China Tianjin Fire Research Institute of MEM Tianjin 300381China

To enhance the explosion suppression effects of water mist, various potassium halide additives were tested in a confined vessel filled with a 10% mixture of methane/air. Air and CO2(0.7 MPa) were used as driver gases. The results revealed that halide additives exhibit considerable suppression effects on explosion overpressure. A30% KI mist decreased the explosion overpressure by 27.46% compared with the suppression by pure water mist under the same conditions. When CO2 is used as the driver gas, it will dissolve in water under high pressure.The synergistic effect of a CO2 solution with an effective additive afforded significant suppression. Under the same conditions, the overpressures suppressed by a mist of 30% KI + 0.7 MPa CO2 solution decreased by 33.53% compared with those suppressed by pure water mist driven by air. The synergistic suppression effect is much better than that of a 0.7 MPa CO2 solution mist or 30% KI mist alone. The multicomponent additives can be considered when suppressing methane/air explosions with pressure-formed water mist.

关键词： Methane Explosion suppression Water mist Halide CO2

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Migration of Cr_2O_7^(2-) and Butanone in Soil and Groundwater System After the Tianjin Port 8·12 Explosion

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Transactions of Tianjin University 2018年第6期24卷 522-531页

作者： Liyan Liu Shaopan Liang Hongchen Liu Wei Tan guorui zhu School of Chemical Engineering and Technology Tianjin University

After the Tianjin Port 8·12 explosion, an enormous amount of potassium dichromate(K_2Cr_2O_7) and butanone(CH_3COCH_2CH_3) leaked into the coastal soil–groundwater system, which potentially threatened the environment and human health. Determining the transport process of hazards is necessary to establish guidelines for remediating the contaminated area. This work aims to investigate the migration of potassium dichromate and butanone in the coastal soil-groundwater system through a coupling unsaturated–saturated numerical model, incorporating the HYDRUS model into the MODFLOW/MT3D model. In the unsaturated zone, two-dimensional HYDRUS model was applied, and its recharge flux at the bottom boundary was utilized as the input of MODFLOW/MT3D model in the saturated zone. Results showed that Cr_2O_7^(2-) migrated much faster than butanone in the unsaturated zone and reached the water table in about 1 year. In comparison, butanone was unlikely to enter the aquifer even 5 years later with a migration depth of about 2.2 m. Driven by groundwater, the Cr_2O_7^(2-) that entered the aquifer migrated about 161 m toward southeast 5 years later. In the saturated zone, the contamination plume covered mainly the southeast area due to the groundwater flow direction.

关键词：地下水系统移植土壤天津爆炸 MODFLOW 数字模型端口

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Effects of Solvent Molecules on the Interlayer Spacing of Graphene Oxide

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Transactions of Tianjin University 2018年第6期24卷 555-562页

作者： Liyan Liu Ruifeng Zhang Ying Liu Haonan zhu Wei Tan guorui zhu Yang Wang School of Chemical Engineering and Technology Tianjin University

Graphene oxide(GO) contains numerous functional groups that facilitate the intercalation of polar solvents. The properties and applications of GO are closely related to its interlayer spacing. We report on the changes in the interlayer spacing of GO after the adsorption of water molecules and the polar organic solvents C_2H_6O_2(EG), C_3H_7NO(DMF), C_5H_9NO(NMP). Experiments were conducted to investigate the variations in the functional groups and structure of GO after solvent adsorption, and they play a vital role in modeling and verifying the results of molecular dynamics simulation. The most stable GO structures are obtained through molecular dynamics simulation. The expansion of the interlayer spacing of GO after the adsorption of monolayer solvent molecules corresponds to the minimum three-dimensional size of the solvent molecules. The spatial arrangement of solvent molecules also contributes to the changes in interlayer spacing. Most adsorbed molecules are oriented parallel to the carbon plane of GO. However, as additional molecules are adsorbed into the interlaminations of GO, the adsorbed molecules are oriented perpendicular to the carbon plane of GO, and a large space forms between two GO interlayers. In addition, the role of large molecules in increasing interlayer spacing becomes more crucial than that of water molecules in the adsorption of binary solvent systems by GO.

关键词：溶剂分子层间距氧化物结构调查空间安排溶剂系统水分子动力学

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Effects of the Imbibition Ability of Extinguishant in Pulverized Coals

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Transactions of Tianjin University 2019年第1期25卷 45-51页

作者： Liyan Liu Haoshuang Gong Xin Shi Dong Lv Wei Tan guorui zhu School of Chemical Engineering and Technology Tianjin University Key Laboratory of Building Fire Protection Engineering and Technology of MPS

The imbibition ability of extinguishant is an important factor influencing the extinguishing effect for smoldering fire in pulverized coals. The coal particle size, bulk compactness, and aqueous solution properties significantly affect the imbibition ability of extinguishment. This work aims to reveal the influence of the properties of pulverized coals and aqueous solution on the imbibition ability of extinguishant for smoldering fire through experiments and capillary theories. The imbibition height and rate were adopted to evaluate the imbibition ability of extinguishment. The results showed that a relatively small bulk compactness and a fine coal particle size negatively influenced the extinguishing process dominantly because of its high surface energy and low wettability. An additive was used to adjust the properties of aqueous solution. The liquid with a larger surface tension, a smaller contact angle, and a lower viscosity induced a better imbibition ability of extinguishment.

关键词： Pulverized coal Smoldering fire Imbibition ability Capillary theories

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A needle tip CCEA microfluidic device based on enhanced Dean flow for cell washing

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Microsystems & Nanoengineering 2021年第5期7卷 105-117页

作者： Xin Shi Wei Tan Yuwen Lu Wenfeng Cao guorui zhu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Tianjin Tumor Hospital Tianjin Medical UniversityTianjin 300070China

Particle/cell washing is an essential technique in biological and clinical manipulations.Herein,we propose a novel circular contraction-expansion array(CCEA)microdevice.It can be directly connected to a needle tip without connection tubes.Its small size and centrosymmetric structure are beneficial to low sample consumption,high connection stability,and a wide application range.Computational fluid dynamics(CFD)simulation results show that the CCEA structure can produce a stronger Dean flow and lead to faster particle/cell focusing than the circle structure and CEA structure with the same length.Experimentally,an optimal flow rate ratio of 1:3 and an optimal total flow rate of 120μL/min were found to ensure a stable fluid distribution.Under these conditions,rapid focusing of 10-20μm particles with high efficiencies was achieved.Compared with a normal CEA device using tubes,the particle loss rate could be reduced from 64 to 7%when washing 500μL of a rare sample.Cell suspensions with concentrations from 3×10^(5)/mL to 1×10^(3)/mL were tested.The high cell collection efficiency(>85%for three cell lines)and stable waste removal efficiency(>80%)reflected the universality of the CCEA microfluidic device.After the washing,the cell activities of H1299 cells and MCF-7 cells were calculated to be 93.8 and 97.5%,respectively.This needle-tip CCEA microfluidic device showed potential in basic medical research and clinical diagnosis.

关键词： needle fluid flow

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Principle, Method of Object-Relation Hypermedia Data Model and Its Application in the Multimedia Spatial Data Management

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Journal of Systems Engineering and Electronics 2000年第1期11卷 53-60页

作者： Wang, Jianhua Guo, Jingjun zhu, guorui Wu, Hehai Tsinghua Univ Beijing China

In this paper, a new multimedia data model, namely object-relation hypermedia data model (O-RHDM) which is an advanced and effective multimedia data model is proposed and designed based on the extension and integration of non first normal form (NF2) multimedia data model. Its principle, mathematical description, algebra operation, organization method and store model are also discussed. And its specific application example, in the multimedia spatial data management is given combining with the Hainan multimedia touring information system.

关键词： Data structures Information management Mathematical models

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