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  • 1
    Online Resource
    Online Resource
    Study on the energy loss characteristics of ultra-low specific speed PAT under different short blade lengths based on entropy production method
    Elsevier BV ; 2023
    In:  Energy Vol. 283 ( 2023-11), p. 129026-
    Details
    In: Energy, Elsevier BV, Vol. 283 ( 2023-11), p. 129026-
    Type of Medium: Online Resource
    ISSN: 0360-5442
    URL: Article
    DOI: 10.1016/j.energy.2023.129026
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2019804-8
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  • 2
    Online Resource
    Online Resource
    Numerical study on water depth effects on hydrodynamic forces acting on berthing ships
    Springer Science and Business Media LLC ; 2017
    In:  Journal of Shanghai Jiaotong University (Science) Vol. 22, No. 2 ( 2017-4), p. 198-205
    Details
    In: Journal of Shanghai Jiaotong University (Science), Springer Science and Business Media LLC, Vol. 22, No. 2 ( 2017-4), p. 198-205
    Type of Medium: Online Resource
    ISSN: 1007-1172 , 1995-8188
    URL: Article
    DOI: 10.1007/s12204-017-1822-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2017
    detail.hit.zdb_id: 2630146-5
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    Simulation Analysis of Power Consumption and Mixing Time of Pseudoplastic Non-Newtonian Fluids with a Propeller Agitator
    MDPI AG ; 2022
    In:  Energies Vol. 15, No. 13 ( 2022-06-22), p. 4561-
    Details
    In: Energies, MDPI AG, Vol. 15, No. 13 ( 2022-06-22), p. 4561-
    Abstract: In order to study the effect of a high twist rate propeller on the flow field characteristics of pseudoplastic non-Newtonian fluids, the numerical simulation method was used to analyze the mixing flow field of pseudoplastic non-Newtonian fluids at different concentrations in this paper. By changing the rotational speed and the blade installation height, the vorticity, turbulent energy, mixing power consumption, mixing time and mixing energy of the flow field were analyzed. By analyzing and comparing the research results, it was found that increasing the mixing propeller speed can effectively improve the mixing effect. Single-layer arrangement of mixing propeller is not suitable to be placed close to the bottom of the tank, and the mixing of the upper flow field is weaker. Under the same conditions, when the viscosity of pseudoplastic non-Newtonian fluid is increased, the high vorticity and high turbulence energy area is reduced to the mixing propeller area, and the time required for mixing 1.25% CMC solution is 246 times longer than that for mixing 0.62% CMC solution and the required mixing energy also increases sharply. The accuracy of the numerical simulation was verified by experiments. Considering the mixing effect and the mixing power consumption, the single-layer arrangement propeller is more suitable for mixing pseudoplastic non-Newtonian fluids with mass fraction of 0.62% CMC or below. This study can provide a reference for the practical application of propeller mixers to mix pseudoplastic non-Newtonian fluids.
    Type of Medium: Online Resource
    ISSN: 1996-1073
    URL: Article
    DOI: 10.3390/en15134561
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2437446-5
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  • 4
    Online Resource
    Online Resource
    A rare case of ectopic pregnancy: Posterior ectopic pregnancy of the iliac vessels
    Wiley ; 2021
    In:  International Journal of Gynecology & Obstetrics Vol. 153, No. 2 ( 2021-05), p. 359-360
    Details
    In: International Journal of Gynecology & Obstetrics, Wiley, Vol. 153, No. 2 ( 2021-05), p. 359-360
    Abstract: Posterior iliac vasculature pregnancy is an extremely dangerous condition; however, surgical treatment can achieve a positive outcome through the cooperation of a multidisciplinary team.
    Type of Medium: Online Resource
    ISSN: 0020-7292 , 1879-3479
    URL: Issue
    URL: Article
    DOI: 10.1002/ijgo.v153.2
    DOI: 10.1002/ijgo.13597
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 1500480-6
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  • 5
    Online Resource
    Online Resource
    Rotating Corrected-Based Cavitation Model for a Centrifugal Pump
    ASME International ; 2018
    In:  Journal of Fluids Engineering Vol. 140, No. 11 ( 2018-11-01)
    Details
    In: Journal of Fluids Engineering, ASME International, Vol. 140, No. 11 ( 2018-11-01)
    Abstract: Cavitation has bothered the hydraulic machinery for centuries, especially in pumps. It is essential to establish a solid way to predict the unsteady cavitation evolution with considerable accuracy. A novel cavitation model was proposed, considering the rotating motion characteristic of centrifugal pump. Comparisons were made with three other cavitation models and validated by experiments. Considerable agreements can be noticed between simulations and tests. All cavitation models employed have similar performance on predicting the pump head drop curve with proper empirical coefficients, and also the unsteady cavitation evolution was well solved. The proposed rotating corrected-based cavitation model (rotating based Zwart-Gerber-Belamri (RZGB)) obtained identical triangle cavity structure with the experiment visualizations, while the others also got triangle structure but with opposite direction. The maximum flow velocity in the impeller passage appears near the shroud, contributing to the typical triangle cavity structure. A preprocessed method for instant rotating images was carried out for evaluating the erosion risk area in centrifugal pump, based on the standard deviation of gray level. The results imply that the unsteady rear part of the attached cavity is vulnerable to be damaged, where the re-entrant flow was noticed. This work presented a suitable cavitation model and reliable numerical simulation approach for predicting cavitating flows in centrifugal pump.
    Type of Medium: Online Resource
    ISSN: 0098-2202 , 1528-901X
    URL: Article
    DOI: 10.1115/1.4040068
    Language: English
    Publisher: ASME International
    Publication Date: 2018
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  • 6
    Online Resource
    Online Resource
    A Flow Model for Side Chambers of Centrifugal Pumps Considering Radial Wall Shear Stress
    SAGE Publications ; 2022
    In:  Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Vol. 236, No. 13 ( 2022-07), p. 7115-7126
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, SAGE Publications, Vol. 236, No. 13 ( 2022-07), p. 7115-7126
    Abstract: The side chamber flow has a fundamental influence on the performance and reliability of centrifugal pumps. However, the radial wall shear stress in the flow modeling of pump side chambers is arbitrarily neglected. The current work proposes a model for the radial wall shear stress, which is an extension of the previous paper (DOI: 10.1115/1.4047532). By using the power-law for the velocity boundary layer and the Blasius law for the wall shear stress, introducing the Ekman layer thickness expression, and deducing the Bödewadt layer thickness expression, the radial wall shear stress on the rotating and stationary disks is formulated and then integrated into the side chamber flow model. Besides, the entire flow field of the centrifugal pump is solved using the computational fluid dynamics (CFD) software ANSYS CFX. The radial wall shear stress calculated by the new side chamber flow model (NSCFM) is in the identical magnitude as CFD. Compared with pressure measurements, NSCFM makes better pressure predictions than CFD from the rear seal to the hub; however, in other areas, CFD results are closer to experimental data than NSCFM results. The flow prediction tools show that the volumetric efficiency and the shroud thrust increase with the increase in flow rate. NSCFM achieves a good compromise between calculation speed and desired accuracy.
    Type of Medium: Online Resource
    ISSN: 0954-4062 , 2041-2983
    URL: Article
    DOI: 10.1177/09544062211073023
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2024890-8
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  • 7
    Online Resource
    Online Resource
    Exposure to di-2-ethylhexyl phthalate and breast neoplasm incidence: A cohort study
    Elsevier BV ; 2024
    In:  Science of The Total Environment Vol. 926 ( 2024-05), p. 171819-
    Details
    In: Science of The Total Environment, Elsevier BV, Vol. 926 ( 2024-05), p. 171819-
    Type of Medium: Online Resource
    ISSN: 0048-9697
    URL: Article
    DOI: 10.1016/j.scitotenv.2024.171819
    RVK:
    AR 10100
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2024
    detail.hit.zdb_id: 1498726-0
    detail.hit.zdb_id: 121506-1
    SSG: 12
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  • 8
    Online Resource
    Online Resource
    Effect of Short Blade Circumferential Position Arrangement on Gas-Liquid Two-Phase Flow Performance of Centrifugal Pump
    MDPI AG ; 2020
    In:  Processes Vol. 8, No. 10 ( 2020-10-20), p. 1317-
    Details
    In: Processes, MDPI AG, Vol. 8, No. 10 ( 2020-10-20), p. 1317-
    Abstract: In order to study the internal flow characteristics of centrifugal pumps with a split impeller under gas-liquid mixed transportation conditions, this paper conducted a steady calculation of the flow field in the centrifugal pump under the conditions of different inlet gas volume fractions based on the Eulerian-Eulerian heterogeneous flow model, using air and water as the working media and the Schiller Nauman model for the interphase resistance. This paper takes a low specific speed centrifugal pump as the research object, through the controlling variables, using the same pump body structure and pump body geometric parameters and setting three different arrangements of long and short blades (each plan uses the same long and short blades) to explore the influence of the short blade arrangement on the low specific speed centrifugal pump performance under a gas-liquid two-phase flow. The research results show that, under pure water conditions, the reasonable arrangement of the short blade circumferential position can eliminate the hump of the centrifugal pump under low-flow conditions, can make the flow velocity in the impeller more uniform, and can optimize the performance of the pump. Under the design conditions and the gas-liquid two-phase inflow conditions, when the circumferential position of the short blades is close to the suction surface of the long blades, some of the bubbles on the suction surface of the long blade can be broken under the work of the pressure surface of the short blade and flow out of the impeller with the liquid, which improves the flow state of the flow field in the impeller.
    Type of Medium: Online Resource
    ISSN: 2227-9717
    URL: Article
    DOI: 10.3390/pr8101317
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2720994-5
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  • 9
    Online Resource
    Online Resource
    Comparison of empirical models using experimental results of electrical submersible pump under two-phase flow: numerical and empirical model validation
    IOP Publishing ; 2022
    In:  Physica Scripta Vol. 97, No. 6 ( 2022-06-01), p. 065209-
    Details
    In: Physica Scripta, IOP Publishing, Vol. 97, No. 6 ( 2022-06-01), p. 065209-
    Abstract: Electrical submersible pumps (ESPs) dealing with gas-liquid multiphase flow face great challenges in the oil and gas industries. The main problem is caused by the accumulation of air bubbles inside the ESP, which degrade the pump performance ranging from minor to major degradation (surging and gas-locking). Several empirical models have been developed to predict head and surging mechanisms. However, the feasibility and versatility of these models are still questionable. Therefore, this study focuses on experimental analysis and their comparison with the existing empirical models (developed to predict Head and surging characteristics under two-phase flow conditions) to examine their validity and versatility in predicting the multiphase performance of pumps. The comparison showed that some models agree well with the given test analysis. However, some models either underestimate or overestimate the predicted values because most of these models were established for high inlet pressure, no water but oil and CO 2 , several impeller and diffusers, different rotational speed, and different pump geometries. Moreover, this study also compares test results with CFD simulations (using Euler-Euler two-fluid model) and shows that the experimental results are consistent and reliable. Furthermore, this study provides a detailed and close insight into the different aspects of empirical models to check whether they can be applied for wider applications or are limited to the type they were developed.
    Type of Medium: Online Resource
    ISSN: 0031-8949 , 1402-4896
    URL: Article
    DOI: 10.1088/1402-4896/ac6e96
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1477351-X
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  • 10
    Online Resource
    Online Resource
    Numerical study on gas – liquid two phase flow characteristic of multistage electrical submersible pump by using a novel multiple-size group (MUSIG) model
    AIP Publishing ; 2022
    In:  Physics of Fluids Vol. 34, No. 6 ( 2022-06-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 34, No. 6 ( 2022-06-01)
    Abstract: Electrical submersible pumps (ESPs) face enormous challenges in the petroleum industry while handling gas–liquid two-phase flow. The major difficulty is caused by the accumulation of gas bubbles inside ESP-impellers, which results in mild to severe degradation in pump performance. Therefore, to analyze the influence of gas entrainment and bubble size, a combination of experimental and numerical analysis is performed on a five-stage mixed-flow ESP in the present study. The experiments are first conducted to analyze the performance of ESP under pure water conditions at different rotating speeds, followed by the gas–liquid two-phase flow experiments that are performed at constant rotating speed (1475 r/min) and for a wide range of inlet gas void fractions (IGVFs). For numerical calculations, a novel multiple-size group (MUSIG) model is applied in ANSYS CFX to analyze the performance and different flow patterns in ESP in different IGVFs and understand the coalescence and breakup phenomena of gas bubbles in the impeller flow passage. The simulation results from the MUSIG model are compared with the Euler–Euler two-fluid model and test results. The MUSIG model can more accurately predict the changes in the performance and internal flow-field of ESP under two-phase flow conditions. Moreover, when the MUSIG model is used to calculate the two-phase flow of the ESP, the first-stage impeller has a higher head than other stages because the flow inside the second and other stages is affected by the disoriented flow coming from the first-stage diffuser and other return channels. Furthermore, this study gives an insight into the comprehensive application of the novel MUSIG model for complex turbo-machine designs such as ESP.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0095829
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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