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Research progress concerning turbulent drag reduction of surfactant solution

Huagong Jinzhan/Chemical Industry and engineering Progress 2016年第6期35卷 1660-1675页

作者： Wei, Jinjia Huang, Chonghai Xu, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'anShaanxi710049 China

In turbulent flow drag reduction applications, surfactant additive is more applicable than polymer for the flow with high shear or in the closed circulation system due to its reversible mechanical degradation advantage. However, there is not enough understanding of the complicated rheology and drag-reduction mechanism of surfactant solution, limiting its practical application in the drag reduction field. This review introduces the research progress of surfactant drag reduction conducted by the authors in recent years on microstructure, complicated rheology characteristics, turbulent structure, as well as their relations with drag reduction and heat transfer, and analyzes the combined drag reduction effect of surfactant additives in the flow and microgroove fabricated on the wall. The stretch devices can significantly improve the heat transfer performance of surfactant drag-reducing flow with a lower pressure loss penalty. To the shortages of present surfactant drag reduction research, several suggestions are given for the future study. The first is to develop environmentally friendly and effective surfactant, the second is optimal design and layout of heat transfer enhancement device for drag-reducing flow, the third is the study on synergetic effect of drag reduction by combing surfactant drag reduction and other drag-reducing ways, and the final one is practical industrial application research on the scale-up, anticorrosion and persistence effect of surfactant drag reduction. © 2016, Chemical Industry Press. All right reserved.

关键词： Heat transfer

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Numerical simulation on single Taylor bubble rising in LBE using moving particle method

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AIP Conference Proceedings 2013年第1期1547卷 700-710页

作者： Xin Li Wen X. Tian Rong H. Chen Guang H. Su Sui Z. Qiu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

An improved meshless numerical method (MPS-MAFL) is utilized to simulate single Taylor bubble rising in liquid LBE to study its hydrodynamic characteristics. The computational region is a circular tube in which the liquid is described using discretized particles by un-uniform grid scheme. The gas-liquid interface was approximately treated as a free surface boundary and nonslip conditions are applied on tube wall. Several simulation results and corresponding analysis including Taylor bubble propagation procedure, pressure distribution, velocity profile around bubble nose and in the wake region as well as in the falling film are presented. Some experimental results and CFD numerical simulations from other previous researchers are compared with the present study as validation. The simulation results agree well with both theoretical analysis and experimental results, which demonstrate the reasonable selection of model as well as the accuracy and reliability of moving particle method.

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Comparative Life Cycle Analysis of Battery Energy Storage Technologies for Grid Applications: Case Study in China 35

Comparative Life Cycle Analysis of Battery Energy Storage Te...

引用

35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2022

作者： Han, Xiaoqu Li, Yanxin Chang, Hongzhang Chen, Nana Huang, Xiaofan Tang, Xiaoping Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Huadian Electric Power Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9788774756989

With ever increasing penetration of renewable energy sources into the power grid, the development and commercialization of large-scale energy storage system (ESS) have been accelerated. It is of great significance to evaluate the sustainability of ESSs for grid applications. In the present work, a comprehensive life cycle inventory analysis model, which involves the manufacturing, usage, transportation and recycling processes, was developed for lithium iron phosphate battery (LIPB), nickel manganese cobalt oxide battery (NMCB) and vanadium redox flow battery (VRFB). The functional unit was 1MWh of delivered energy from ESS to the grid. The ReCiPe 2016 (H) method was selected and data analysis was carried out in SimaPro software. The global warming potential (GWP) of LIPB, NMCB and VRFB in the grid peak-shaving scenario were obtained as 129 kgCO2-eq/MWh, 146 kgCO2-eq/MWh and 365 kgCO2-eq/MWh, respectively. GWP of different batteries in renewable energy sources (photovoltaic and wind power) was also predicted based on the developed model. The key materials that contributed significantly to GWP were also identified. Moreover, the future trend in GWP was analyzed based on the carbon peaking and carbon neutrality goals. It is indicated that GWP of LIPB, NMCB and VRFB in the announced pledges scenario could be reduced to approximately 75% in 2030, and 24%~41% in 2050, respectively. Parametric analysis was then carried out, indicating that the round-trip efficiency and number of daily cycles exhibited the significant influence. The results would promote the environment, policy and business model optimization for large-scale energy storage in the low-carbon power systems. © Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.

关键词： Life cycle

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Experimental study on enrichment of low concentration coal bed methane with solar energy

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2015年第12期36卷 2637-2640页

作者： Yu, Hao-Tian Li, Na Zhou, Qu-Lan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

A large number of low concentration methane gas is emitted directly into the atmosphere during the coal production, resulting in a serious waste of energy and the greenhouse effect. Aiming at the shortcomings of conventional coal mine methane enrichment technology existed, the papar presented separation and enrichment coal mine methane with the Soret effect. The theoretical analysis proposed the main parameters of the enrichment process is the initial methane concentrations and the temperature gradient. The effect law of these parameters is studied by experiments and numerical simulations. © 2015, Science Press. All right reserved.

关键词： Coal

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Unstructured grid based volume-of-fluid method

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2010年第9期44卷 99-103页

作者： Huang, Meng Wu, Lilong Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

A simple line interface calculation-volume of fluid(SLIC-VOF) interface reconstruction technology was developed on the basis of the triangular unstructured grid. For a cell containing the interface, a straight line segment parallel with one side of the triangle cell was set on the interface according to the volume fractions in the three neighbor cells. The volume flux of the fluid with the assigned phase was determined by the geometry relation between the interface line and the volume flux on each side. Three tests were performed to verify the feasibility of the present unstructured SLIC-VOF interface reconstruction method, including an advection test of a right-angled triangle, the Zalesak slotted disk rotation test, and a single-vortex shearing flow test. The results show that the accuracy of the present method for the unstructured grid with 7600 cells is comparative with that of the conventional SLIC-VOF method for the structured grid with 6400 cells after the interface restoration in the reversed velocity field.

关键词： Cells

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Deformation and Motion of Compound Droplet Adhering to Wall

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2017年第12期38卷 2636-2640页

作者： Shang, Xing-Long Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The compound droplet will exhibits much more complex behavior when it adheres to a wall under flow. Studying the influence of related parameter plays an important role in the manipulation of the compound droplet. In this paper, a three-dimensional numerical method involving the moving contact line problem is developed by integrating the generalized Navier boundary condition into the front-tracking method. The proposed method is applied to study the effects of the capillary number of inner and outer interface and the volume of inner droplet on the deformation and motion of the compound droplet adhering to the wall with considering the contact angle hysteresis effect. It found that the compound droplet is more like to be detached or pinched-off by the flow when the capillary number of outer interface and the volume of inner droplet are large and the capillary number of inner interface is small. key words © 2017, Science Press. All right reserved.

关键词： Deformation

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Rheological characteristics of CTAC aqueous solutions under the combined effects of shearing and temperature

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2014年第2期35卷 278-281页

作者： Xu, Na Wei, Jin-Jia State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The rheological properties of CTAC/NaSal aqueous solutions (NaSal had same molarity with CTAC.) with different concentrations were experimentally investigated at different temperatures ranging from 10°C to 70°C and different shear rates from 1 s-1 to 300 s-1. There were a critical shear rate and a critical temperature for all measured surfactant aqueous solutions with mass concentrations ranging from 0.001% to 0.015%. The effects of temperature and shearing on viscosity properties of surfactant solution varied with the concentration. Rheological characteristics of viscosity showed complex variations under the combined effects of temperatures and shearing even for the solutions with same concentration. Surfactant solution with relatively high concentration thickened for the second time when suffering from strong shearing and high temperature.

关键词： Temperature

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Technology and mechanism of water scale removal by electrochemical method

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2009年第5期43卷 104-108页

作者： Xu, Hao Yan, Wei Tang, Chengli State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The scale inhibition and removal processes by electronic water treatment were investigated in this study. The results show that the treatment of scale inhibition with 7.0V can be used first for the water with the hardness over 300 mgL-1(CaCO3), and then the treatment of scale removal with 5.0V can be applied when the water hardness decreases to less than 130 mgL-1(CaCO3). With the present energy-saving approach, more than 90 percent of the scale ions can be removed after treatment and no obvious scale will decompose on the surface of the heat exchanger. The SEM figures depict that the crystal morphology of scale is affected by the electronic water treatment. The crystal morphology of scale with and without the electronic water treatment is calcite and aragonite, respectively.

关键词： Calcite

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Supersonic ejector to boost production from low pressure natural gas field

Supersonic ejector to boost production from low pressure nat...

引用

International Conference on Computer Distributed Control and Intelligent Environmental Monitoring

作者： Wu, Gesheng Chong, Daotong Chen, Weixiong Yan, Junjie State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chendu China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9780769543505

An effective way to boost natural gas production from low pressure gas field was introduced in the paper. The supersonic ejector used the energ off high pressure gas wells, which was generally wasted through the choke valve, as its power supply to boost the low pressure gas production. The field experiment of the natural gas ejector was carried out, and the performance of the ejector was also presented. Moreover, the production of low pressure natural gas well was compared when the natural gas ejector was used or not. The economic analysis shows that the recovery period of the capital was less than several months. © 2011 IEEE.

关键词： Natural gas

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Numerical simulation of interaction between elliptic rings by discrete vortex method

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2009年第7期30卷 1149-1151页

作者： Wang, Zhi-Wei Chen, Bin Guo, Lie-Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In present paper a three dimensional discrete vortex filament method is proposed to simulate unsteady incompressible vortical flows, through which the interaction of two coaxial vortex rings was studied. First the process of head-on collision of two circular rings was reproduced and compared with experimental result. The good agreement between numerical work and experiment verified our model. Then the motion of single elliptic ring was studied and a fit expression was given, through which the axis-switching period of single elliptic ring can be calculate effectively. At last the head-on collision and leapfrogging process of two coaxial elliptic rings was studied respectively. For the case of head-on collision of two elliptic rings, the shape of new generated ring was similar but larger than initial elliptic ring. While for case of two elliptic rings moving in same direction, the axis-switching process of elliptic ring is accompanied with the leapfrogging process.

关键词： Vortex flow

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