The Experts below are selected from a list of 339 Experts worldwide ranked by ideXlab platform

Shimin Wang - One of the best experts on this subject based on the ideXlab platform.

  • velocity characterization of dense phase pneumatically conveyed solid particles in Horizontal Pipeline through an integrated electrostatic sensor
    International Journal of Multiphase Flow, 2015
    Co-Authors: Shimin Wang
    Abstract:

    Abstract Dense phase pneumatic conveying of pulverized fuel particles under high pressure is one of the key techniques in large scale gasification of coal and petroleum coke. The real time and continuous measurement of dense phase gas–solid flow parameters such as particle velocity, concentration and mass flow rate has great significance for the in-depth understanding of particle flow dynamic behaviors and the optimized design of the conveying system. In this paper, an integrated electrostatic sensor is designed and used to explore the flow characteristics of anthracite and petroleum coke particles on a dense phase pneumatic conveyor. The ring electrodes in the integrated sensor are capable of measuring the “mean” velocity of solid particles over the whole cross-section of the Pipeline, while the arc electrodes are employed to determine the local velocity of particles near them. The experimental results on a dense phase pneumatic conveyor under high pressure demonstrate that the flow characteristics depend on the physical properties of solid particles and carrying gas. Petroleum coke particles are much easier to be suspended in the gas flow than the anthracite particles, but its flow stability is worse. The local velocities from the arc electrode pairs mounted on the top of the Pipeline are usually higher than those from the arc electrodes on the bottom for a stratified flow. The velocity from the ring electrode pair, indicating the mean velocity of particles over the whole cross-section, is usually higher than the local velocities from the arc electrode pairs for a suspension flow. In addition, the relationship between the mass flow rate and charge level of dense phase pneumatically conveyed solid particles is very complicated due to the complexity of the particle flow and the charge level cannot be used to measure particle concentration or mass flow rate.

  • Dense-phase pneumatic conveying under pressure in Horizontal Pipeline
    Particuology, 2011
    Co-Authors: Daoye Yang, Bin Zhou, Shimin Wang
    Abstract:

    Abstract The gas/solid flow regime of dense-phase pneumatic conveying of pulverized coal under a pressure of 4.0 MPa in Horizontal Pipeline 10 mm in diameter, is monitored by electrical capacitance tomography (ECT) using 8 electrodes. To improve the accuracy of the capacitance measurement, an AC-based single-channel capacitance measuring circuit was developed, and a modified iterative Landweber algorithm was used to reconstruct the image. A two-fluid model based on the kinetic theory of granular flow was used to study the three-dimensional steady-state flow behavior of dense-phase pneumatic conveying of pulverized coal.

Qiang Wang - One of the best experts on this subject based on the ideXlab platform.

  • measurement of interphase forces based on dual modality ert dp sensor in Horizontal two phase flow gas water
    Measurement, 2019
    Co-Authors: Lide Fang, Qiaoqiao Zeng, Mingming Li, Xiaoting Li, Yousef Faraj, Peipei Wang, Mi Wang, Qiang Wang
    Abstract:

    Abstract In order to better understand the mechanisms of two-phase flow and the prevailing flow regimes in Horizontal Pipelines, the evaluation of interphase forces is paramount. This study develops a method to quantitatively estimate the interphase force in two-phase gas-water flow in Horizontal Pipeline. The electrical resistance tomography technology is used to measure the void fraction, while the differential pressure perpendicular to the Horizontal pipe is measured in different flow patterns via a Differential Pressure sensor. The inner pipe diameter is 50 mm, the water flow range from 3.26 m3/h to 7.36 m3/h, the gas flow rate range from 1 to 60 l/min, which covered a range of flow patterns, the absolute pressure range from 0.07 MPa to 0.12 MPa. The relationship between the differential pressure drop and interphase force is established, and the effects of these forces on the flow are analyzed. Experimental results indicate that the dual-modality measurement system was successfully provided a quantitative evaluation of interphase forces in two-phase Horizontal gas-water flow.

  • measurement of interphase forces based on dual modality ert dp sensor in Horizontal two phase flow gas water
    Measurement, 2019
    Co-Authors: Lide Fang, Qiaoqiao Zeng, Mingming Li, Xiaoting Li, Yousef Faraj, Peipei Wang, Mi Wang, Qiang Wang
    Abstract:

    Abstract In order to better understand the mechanisms of two-phase flow and the prevailing flow regimes in Horizontal Pipelines, the evaluation of interphase forces is paramount. This study develops a method to quantitatively estimate the interphase force in two-phase gas-water flow in Horizontal Pipeline. The electrical resistance tomography technology is used to measure the void fraction, while the differential pressure perpendicular to the Horizontal pipe is measured in different flow patterns via a Differential Pressure sensor. The inner pipe diameter is 50 mm, the water flow range from 3.26 m3/h to 7.36 m3/h, the gas flow rate range from 1 to 60 l/min, which covered a range of flow patterns, the absolute pressure range from 0.07 MPa to 0.12 MPa. The relationship between the differential pressure drop and interphase force is established, and the effects of these forces on the flow are analyzed. Experimental results indicate that the dual-modality measurement system was successfully provided a quantitative evaluation of interphase forces in two-phase Horizontal gas-water flow.

  • visualization of gas oil water flow in Horizontal Pipeline using dual modality electrical tomographic systems
    IEEE Sensors Journal, 2017
    Co-Authors: Qiang Wang, Mi Wang, Kent Wei, Changhua Qiu
    Abstract:

    Employing dual-modality tomography inherently involves data from multiple dimensions, and thus a coherent approach is required to fully exploit the information from various dimensions. This paper describes a novel approach for dual-modality electrical resistance and capacitance tomography (ERT-ECT) to visualize gas–oil–water flow in Horizontal Pipeline. Compared with the conventional methods with dual-modality tomographic systems, the approach based on thresholding takes the account of multi-dimensional data, which therefore is capable of providing insights into investigated flow in both spatial and temporal terms. The experimental results demonstrate the feasibility of the approach, by which six common flow regimes in Horizontal Pipeline flow are visualized based on the multi-dimensional data with ERT-ECT systems, including (wavy) stratified flow, plug flow, slug flow, annular flow, and bubbly flow. Although the present approach is proposed for data acquired with an ERT-ECT system, it is potentially adaptable to other dual-modality tomographic systems that use concentration tomograms as inputs.

  • Experimental tomographic methods for analysing flow dynamics of gas-oil-water flows in Horizontal Pipeline
    Journal of Hydrodynamics, 2016
    Co-Authors: Qiang Wang, Mi Wang, Kent Wei, Changhua Qiu, Jiri Polansky, Bishal Karki, Asaad Kenbar, David Millington
    Abstract:

    Gas-oil-water three phase flow is of practical significance in oil and gas industries. An insight into the dynamics of such multiphase flows is significantly valuable to obtain optimal design parameters and operational conditions. Since flow patterns are sensitive to pipe geometry, flow conditions and thermophysical properties of fluid, it is extremely challenging to provide a universal solution for visualisation of three phase Horizontal flows. This study deals with a fully developed, turbulent three phase flow and presents the outcomes of electrical tomographic imaging techniques to visualise gas-oil-water flows in a Horizontal Pipeline.

Yong Yan - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigations into the transient behaviours of CO2 in a Horizontal Pipeline during flexible CCS operations
    International Journal of Greenhouse Gas Control, 2018
    Co-Authors: Wenbiao Zhang, Shi Liu, Ding Shao, Yong Yan, Tao Wang
    Abstract:

    Abstract Power plants with CCS facilities should be operated flexibly because of the variability in electricity demand. Load change, start-up and shutdown will occur during flexible CCS operations. It is necessary to investigate the transient behaviours of CO2 flow in the Pipeline during these operations for optimized operation of CCS plants. However, very limited experimental data for gas-liquid two-phase CO2 under CCS conditions are available. As a result, experimental observations of the CO2 transient behaviours were conducted on a CO2 gas-liquid two-phase flow rig. Load change, start-up and shutdown of a CO2 flow process were replicated on the rig. Coriolis flowmeters and high-speed imaging equipment were used to observe the mass flow rate, thermophysical properties and flow regimes of the CO2 flow. There are significant discrepancies in the mass flow rate of two-phase CO2 between the test value and the reference value during the load change. During the start-up operation, the flow regime transits from liquid slug flow to gas bubbly flow and the mass flow rate from the Coriolis flowmeter presents two-step changes. In addition, the depressurization and evaporation of liquid CO2 in the Pipeline were observed during the shutdown operation.

  • investigations of the transportation characteristics of biomass fuel particles in a Horizontal Pipeline through cfd modelling and experimental measurement
    Biomass & Bioenergy, 2012
    Co-Authors: Sreenivasa Rao Gubba, D B Ingham, K J Larsen, M Pourkashanian, Xiangchen Qian, A Williams, Yong Yan
    Abstract:

    Recent national and international emission legislations to reduce emissions of carbon dioxide are forcing power generation industries using coal to look at various alternatives, such as biomass and especially by co-firing techniques. Biomass is transported to the burners either mixed with the primary fuel, in general, coal, or used in dedicated Pipelines. In both cases, transportation of biomass is difficult due to its composition, size, shape and physical behaviour in comparison to the transportation of coal. This study considers experimental measurements for biomass particle transportation in a Pipeline with a transverse elbow and compares the results with those using computation fluid dynamic (CFD) techniques. Various materials: flour, willow, wood, bark and a mixture of flour and willow, have been considered in the present investigation. The experimental work was performed using the dynamic changes in the electrostatic charges of biomass particles in conjunction with correlation signal processing techniques. The CFD simulations were performed by considering the effects of gravity, non-spherical drag (based on estimated shape factor), detailed information of the particle distribution, particle wall collisions and particle–particle interactions. Good quantitative and qualitative agreement was obtained between the CFD simulations and the experimental data. It is concluded that particle–particle interactions are of less importance if the mass loading ratio of particles to air is less than 0.03.

  • Characterization of pneumatic transportation of pulverised coal in a Horizontal Pipeline through measurement and computational modelling
    Fuel, 2009
    Co-Authors: A. Chinnayya, Yong Yan, Anna Chtab, Jiaqing Shao, Robert M. Carter, Sebastien Caillat
    Abstract:

    Pneumatic conveyors which feed the burners at coal fired power plants are not designed for the injection of an increasingly wide variety of modern fuels. The objective of this study is to understand and predict the stable delivery of fuel to the burners. The pneumatic transportation of pulverised coal in a Horizontal Pipeline has been investigated using a classic dual approach: measuring a set of characteristic parameters of the dispersed flow as well as its computational modelling. The Large Eddy Simulation approach is used for the modelling of the air/fuel two-phase flow. A particular treatment for the solid phase has been designed in order to cope with gravity effects. A good qualitative agreement between the modelling results and the experimental data has been found. The importance of gravity effects compared to inter-particle collisions is addressed.

  • hilbert huang transform based signal analysis for the characterization of gas liquid two phase flow
    Flow Measurement and Instrumentation, 2007
    Co-Authors: Hao Ding, Zhiyao Huang, Zhihuan Song, Yong Yan
    Abstract:

    Abstract This paper reports the application of the Hilbert–Huang Transform (HHT) to the dynamic characterization of gas–liquid two-phase flow in a Horizontal Pipeline. A differential pressure fluctuation signal of gas–liquid two-phase flow is adaptively decomposed into Intrinsic Mode Functions (IMFs) through the use of Empirical Mode Decomposition (EMD) methods. Based on the EMD, the associated time–frequency–energy distribution, i.e., the Hilbert spectrum, is obtained for the analysis of the differential pressure fluctuation signal and subsequent identification of its corresponding energy characteristics. The relationship between the energy distribution of the signal and the flow pattern is established. In order to assess the effectiveness of the approach, the results obtained using the HHT are compared with those from Fourier analysis and wavelet based methods. It is found that the extracted energy characteristics give a good indication of the dynamic state of the gas–liquid two-phase flow and thus can be used for flow pattern recognition. The proposed method is a useful tool for the in-depth understanding and subsequent quantitative characterization of gas–liquid two-phase flow.

Mi Wang - One of the best experts on this subject based on the ideXlab platform.

  • measurement of interphase forces based on dual modality ert dp sensor in Horizontal two phase flow gas water
    Measurement, 2019
    Co-Authors: Lide Fang, Qiaoqiao Zeng, Mingming Li, Xiaoting Li, Yousef Faraj, Peipei Wang, Mi Wang, Qiang Wang
    Abstract:

    Abstract In order to better understand the mechanisms of two-phase flow and the prevailing flow regimes in Horizontal Pipelines, the evaluation of interphase forces is paramount. This study develops a method to quantitatively estimate the interphase force in two-phase gas-water flow in Horizontal Pipeline. The electrical resistance tomography technology is used to measure the void fraction, while the differential pressure perpendicular to the Horizontal pipe is measured in different flow patterns via a Differential Pressure sensor. The inner pipe diameter is 50 mm, the water flow range from 3.26 m3/h to 7.36 m3/h, the gas flow rate range from 1 to 60 l/min, which covered a range of flow patterns, the absolute pressure range from 0.07 MPa to 0.12 MPa. The relationship between the differential pressure drop and interphase force is established, and the effects of these forces on the flow are analyzed. Experimental results indicate that the dual-modality measurement system was successfully provided a quantitative evaluation of interphase forces in two-phase Horizontal gas-water flow.

  • measurement of interphase forces based on dual modality ert dp sensor in Horizontal two phase flow gas water
    Measurement, 2019
    Co-Authors: Lide Fang, Qiaoqiao Zeng, Mingming Li, Xiaoting Li, Yousef Faraj, Peipei Wang, Mi Wang, Qiang Wang
    Abstract:

    Abstract In order to better understand the mechanisms of two-phase flow and the prevailing flow regimes in Horizontal Pipelines, the evaluation of interphase forces is paramount. This study develops a method to quantitatively estimate the interphase force in two-phase gas-water flow in Horizontal Pipeline. The electrical resistance tomography technology is used to measure the void fraction, while the differential pressure perpendicular to the Horizontal pipe is measured in different flow patterns via a Differential Pressure sensor. The inner pipe diameter is 50 mm, the water flow range from 3.26 m3/h to 7.36 m3/h, the gas flow rate range from 1 to 60 l/min, which covered a range of flow patterns, the absolute pressure range from 0.07 MPa to 0.12 MPa. The relationship between the differential pressure drop and interphase force is established, and the effects of these forces on the flow are analyzed. Experimental results indicate that the dual-modality measurement system was successfully provided a quantitative evaluation of interphase forces in two-phase Horizontal gas-water flow.

  • visualization of gas oil water flow in Horizontal Pipeline using dual modality electrical tomographic systems
    IEEE Sensors Journal, 2017
    Co-Authors: Qiang Wang, Mi Wang, Kent Wei, Changhua Qiu
    Abstract:

    Employing dual-modality tomography inherently involves data from multiple dimensions, and thus a coherent approach is required to fully exploit the information from various dimensions. This paper describes a novel approach for dual-modality electrical resistance and capacitance tomography (ERT-ECT) to visualize gas–oil–water flow in Horizontal Pipeline. Compared with the conventional methods with dual-modality tomographic systems, the approach based on thresholding takes the account of multi-dimensional data, which therefore is capable of providing insights into investigated flow in both spatial and temporal terms. The experimental results demonstrate the feasibility of the approach, by which six common flow regimes in Horizontal Pipeline flow are visualized based on the multi-dimensional data with ERT-ECT systems, including (wavy) stratified flow, plug flow, slug flow, annular flow, and bubbly flow. Although the present approach is proposed for data acquired with an ERT-ECT system, it is potentially adaptable to other dual-modality tomographic systems that use concentration tomograms as inputs.

  • proper orthogonal decomposition as a technique for identifying two phase flow pattern based on electrical impedance tomography
    Flow Measurement and Instrumentation, 2017
    Co-Authors: Jiri Polansky, Mi Wang
    Abstract:

    Collecting of very large amount of data from experimental measurement is a common practice in almost every scientific domains. There is a great need to have specific techniques capable of extracting synthetic information, which is essential for understanding and modelling the specific phenomena. The Proper Orthogonal Decomposition (POD) is one of the most powerful data analysis methods for multivariate and nonlinear phenomena. Generally, POD is a procedure that takes a given collection of input experimental or numerical data and creates an orthogonal basis constituted by functions estimated as the solutions of an integral eigenvalue problem known as a Fredholm equation. This paper proposes a novel approach by utilising POD to identify flow structure in Horizontal Pipeline, specially, for slag, plug and wavy stratified air-water flow regimes, , in which POD technique extends the current evaluation procedure of electrical impedance tomography [31]. This capability is extended by the implementation of POD as an identifier for typical Horizontal two phase flow regimes. Direct POD method introduced by Lumley and Snapshot POD method introduced by Sirovich are applied The POD snapshot matrices are reconstructed from electrical tomography measurement under specific flow conditions. It is expected that this study may provide new knowledge on two phase flow dynamics in a Horizontal Pipeline and useful information for further prediction of multiphase flow regime.

  • Experimental tomographic methods for analysing flow dynamics of gas-oil-water flows in Horizontal Pipeline
    Journal of Hydrodynamics, 2016
    Co-Authors: Qiang Wang, Mi Wang, Kent Wei, Changhua Qiu, Jiri Polansky, Bishal Karki, Asaad Kenbar, David Millington
    Abstract:

    Gas-oil-water three phase flow is of practical significance in oil and gas industries. An insight into the dynamics of such multiphase flows is significantly valuable to obtain optimal design parameters and operational conditions. Since flow patterns are sensitive to pipe geometry, flow conditions and thermophysical properties of fluid, it is extremely challenging to provide a universal solution for visualisation of three phase Horizontal flows. This study deals with a fully developed, turbulent three phase flow and presents the outcomes of electrical tomographic imaging techniques to visualise gas-oil-water flows in a Horizontal Pipeline.

Daoye Yang - One of the best experts on this subject based on the ideXlab platform.

  • Dense-phase pneumatic conveying under pressure in Horizontal Pipeline
    Particuology, 2011
    Co-Authors: Daoye Yang, Bin Zhou, Shimin Wang
    Abstract:

    Abstract The gas/solid flow regime of dense-phase pneumatic conveying of pulverized coal under a pressure of 4.0 MPa in Horizontal Pipeline 10 mm in diameter, is monitored by electrical capacitance tomography (ECT) using 8 electrodes. To improve the accuracy of the capacitance measurement, an AC-based single-channel capacitance measuring circuit was developed, and a modified iterative Landweber algorithm was used to reconstruct the image. A two-fluid model based on the kinetic theory of granular flow was used to study the three-dimensional steady-state flow behavior of dense-phase pneumatic conveying of pulverized coal.