检索结果-内蒙古大学图书馆

Study on effectiveness of flow parameters in evaluating discharge performance of sawdust-coal mixtures

BIOMASS & BIOENERGY 2025年 194卷

作者： Yang, Yunfei Guo, Xiaolei Lu, Haifeng Liu, Haifeng East China Univ Sci & Technol Shanghai Engn Res Ctr Coal Gasificat Shanghai 200237 Peoples R China

Biomass-coal co-gasification technology is a new approach that considers both energy demand and carbon emission reduction policies. A comprehensive understanding of flow properties of the biomass-coal mixture is important for the resolution of flow problems in the pneumatic conveying unit of the entrained flow gasification process. However, inconsistency exists between the laws obtained from different characterization methods of the flow properties. The discharge rate of the sawdust-coal mixture prepared by the co-milling method showed a decrease of about 21.4 % when the biomass mixing ratio reached 20 %. Based on the comparison of different characterization methods, the flow parameters that can effectively evaluate the discharge performance of the mixture were analyzed. In addition, an empirical model of the discharge rate with respect to the biomass mixing ratio was established with an error within +/- 15 %, which provides a reference for the mixing of biomass in cogasification process.

关键词： Sawdust-coal mixture Biomass mixing ratio flow parameter Discharge rate

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Visualization experiment and machine learning modeling for falling-film systems

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CHEMICAL ENGINEERING RESEARCH & DESIGN 2023年 199卷 399-412页

作者： Kandukuri, Prudviraj Kaki, Ramesh Deshmukh, Sandip Katiresan, Supradeepan Birla Inst Technol & Sci Dept Mech Engn Pilani Hyderabad Campus Hyderabad India

The liquid film coverage over the tube wall is important in flow hydrodynamics, and flow hydrodynamics are important in heat transfer performance in falling-film systems as well. An experimental setup is used with the aid of a high-speed camera to visualize the flow behavior, which is challenging to see with the naked eye. The set of experiments are carried out by varying the important working parameters such as Reynolds number (250-458) and inter tube distance (20/30/40 mm). The Sobel image analysis method is developed to quantify flow parameters such as jet diameter and axial film thickness. The liquid jet diameter increases with increasing tube spacing for the same Reynolds number and decreases with increasing inter tube distance for the same Reynolds number. The formation of connected droplets causes disturbances near the liquid jet head. The connected droplet phenomenon causes the liquid jet diameter to increase and decrease in this region. Furthermore, there is a distinct pattern in the axial film coverage beneath and above the tube wall. Three data sets are generated for each parameter using an image analysis approach, which can then be used to train and develop machine learning models. The findings indicated that the Decision Tree, Random Forest, and Gradient Boosting models consistently better performed the other models on all features. Although a few models have lower error percentages below the datum line, consistency in each feature is still required. The results of the flow visualization experiments, as well as the machine learning models developed, can be used to quantify flow parameters and improve flow characteristics for better design. (c) 2023 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.

关键词： Falling-film flow parameter High-speed camera Image analysis Machine learning

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Strategic approach on flow characteristics of magnetic nano adsorbent on treatment of dye wastewater

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ENVIRONMENTAL QUALITY MANAGEMENT 2022年第1期32卷 13-25页

作者： Radha, Kuravappullam Vedaiyan Balajee, Linkesh AnnaUniversity Bioprod Lab Dept Chem Engn AC Tech Chennai Tamilnadu India Anna Univ Dept Chem Engn Bioprod Lab AC Tech Chennai 600025 Tamilnadu India

In the present study, magnetic nanoparticles were synthesized through chemical precipitation using sodium hydroxide as precipitating agent. On characterization, X-ray diffraction results revealed the formation of pure crystalline nanoparticles. Chemical bond formations were confirmed through Fourier transform infrared analyzes. Scanning Electron Microscope showed spherical shaped nanoparticles and Transmission Electron Microscope analysis confirmed the size range between 46.47 and 51.02 nm for 0.3 and 0.4 M of sodium hydroxide. Energy dispersive spectroscopy analyzes confirmed high purity for the synthesized nanoparticles. On dye adsorption, 94.56% and 98.35% adsorption were achieved for Eosin and Reactive dyes, respectively. The experiments fitted well with Langmuir model and pseudo-second order was the best fit (R2 = 0.99 for Eosin and 0.985 for Reactive dye) with observed rate constant as 4 x 10-2 g mg-1 min-1 and 6 x 10-2 g mg-1 min-2. On flow parameter study for effective adsorption, it was found that the nanoparticles were preserved in the column for various pore volume without distinctive discharge. Desorption studies were done and it was found that 95% effectiveness achieved for five cycles. Therefore, the magnetic nanoparticles can be used as potential nano adsorbent for the degradation of dyes without affecting the environment.

关键词： adsorption Eosin dye flow parameter kinetics magnetic nanoparticles reactive dye

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Online rheological measurement of dilute liquid-solid two-phase flow with ultrasound Doppler technique

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flow MEASUREMENT AND INSTRUMENTATION 2023年第1期90卷

作者： Zhang, Hanrui Dong, Feng Murai, Yuichi Tan, Chao Tianjin Univ Sch Elect & Informat Engn Tianjin Key Lab Proc Measurement & Control Tianjin 300072 Peoples R China Hokkaido Univ Fac Engn Lab Flow Control N13W8 Sapporo Hokkaido 0608628 Japan

An online and non-invasive ultrasound Doppler based rheometric method is proposed to measure the flow parameters in a dilute liquid-solid two-phase flow and analyze its rheological behaviours. The flow rate is obtained by integrating the ultrasound Doppler velocity profiles through annuluses formed across the cross-sectional area of the pipe while the pressure drop is calculated by choosing suitable models that captures the working conditions of quasi-homogeneous and heterogeneous dilute liquid-solid flows. Wall shear rate and wall shear stress are obtained from the above measurements with the rheological measurement models established. An experimental platform is built to form polystyrene-water and sand-water liquid-solid two-phase fluids for tests. The proposed method has mean absolute errors of 2.53% and 3.49% in flow rate measurement and 3.67% and 5.87% in pressure measurement for polystyrene-water and sand-water fluids, respectively. The experimental results have shown that the rheological characteristics of both fluids fit well with the power law fluid model.

关键词： Liquid -solid two-phase flow flow parameter Rheological characteristic Ultrasound Doppler technique Measurement model

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Developing quantitative analysis program of blood flow velocity according to vessel diameter for neovascular age-related macular degeneration using OCTA-VISTA

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SCIENTIFIC REPORTS 2024年第1期14卷 1-10页

作者： Tanaka, Fumi Mino, Toshihiro Moriguchi, Yoshikiyo Nagahama, Hidenori Tamura, Masato Oshima, Yuji Akiba, Masahiro Enaida, Hiroshi Saga Univ Fac Med Dept Ophthalmol 5-1-1 Nabeshima Saga 8498501 Japan Topcon Corp Res & Dev Div 75-1 Hasunuma ChoItabashi Ku Tokyo 1748580 Japan Fukuoka Dent Coll Dept Med Sect Ophthalmol 2-15-1 TamuraSawara Ku Fukuoka 8140193 Japan

This study aimed to develop a quantitative analysis program of blood flow velocity by vessel diameter in neovascular age-related macular degeneration (nAMD) subjects using high-speed swept-source optical coherence tomography angiography. This retrospective, observational, cross-sectional study included 10 eyes of healthy volunteers and 4 eyes of patients with representative nAMD. Novel scan patterns and variable interscan time analysis were utilized to measure the flow parameter, a surrogate marker of blood flow velocity, by vessel diameter within different depths. Detected vessels at superficial and deep as well as outer retinal regions were categorized into three vessel diameters (major vessels (> 40 mu m), medium vessels (20-40 mu m), and capillaries (< 20 mu m)). The flow parameter increased with enlarged vessel diameter in all participants at superficial and deep layer. All nAMD subjects, except for type 3 macular neovascularization (MNV), contained a structure dominated by medium vessels at outer retinal region. The mean flow parameter at outer retinal region was type 1 MNV (1.46 ms(-1)), type 1 + 2 MNV (0.98 ms(-1)), and polypoidal choroidal vasculopathy, including branching vascular networks (1.46 ms(-1)). This program provides the possibility to extract the blood flow information at different depths by vessel diameter types, which is considered to be useful tool for evaluating nAMD pathology and activity.

关键词： Neovascular age-related macular degeneration flow parameter Vessel diameter Optical coherence tomography angiography Variable interscan time analysis

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Experimental Research on Atomization parameters in Spray Cooling System 20

Experimental Research on Atomization Parameters in Spray Coo...

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20th IEEE International Conference on Electrical Machines and Systems (ICEMS)

作者： Liu, Shaoyan Ruan, Lin Li, Zhenguo Chen, Ying Kang, Yuhui Chinese Acad Sci Inst Elect Engn 6 Beiertiao Beijing Peoples R China Univ Chinese Acad Sci 19A Yuquan Rd Beijing Peoples R China

ISBN: (纸本)9781538632468

atomization parameters of liquid droplets in the spray cooling system-droplets velocity, droplets diameter, droplets distribution and others influence significantly on the heat exchange efficiency. This paper uses Phase Doppler Particle Analyser(PDPA) to make a precise measurement on atomization parameters on the spray cooling system used pressure atomizing spray nozzle. Then described the distribution of atomization parameters and summarized its regularity. Through the fitting on large quantities of data obtained in test, it's practicable to get the correlation formula between atomization parameters and pressure. Quantitative links between flow and atomization parameters will have an important reference to quantitative design of spray cooling system.

关键词： atomization parameter spray cooling flow parameter experimental correlation

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Effects of flow parameters on the Stability of Conical Liquid Sheets

Effects of Flow Parameters on the Stability of Conical Liqui...

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2015 International Conference on Automation,Mechanical Control and Computational Engineering(AMCCE 2015)

作者： FU Qingfei DU Minglong School of Astronautics Beijing University of Aeronautics and Astronautics

ISBN: (纸本)9781510803084

Linear instability theory can evaluate the beginnings of instability in a liquid sheet. It provides a good starting point for predicting unstable, wave-type behavior in a liquid sheet with disturbances. An existing linear instability analysis method was used to investigate the breakup of a conical sheet formed by a pressure swirl injector. The dispersion relation for the conical sheet was solved numerically. The effect of flow parameters and spray condition on the linear stability of conical sheet is mainly discussed.

关键词： Atomization Linear stability Conical liquid sheet flow parameter

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Measurement of Phase Fraction in Oil-Water Two-Phase flow Using Ultrasound Attenuation Method

Measurement of Phase Fraction in Oil-Water Two-Phase Flow Us...

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Chinese Automation Congress (CAC)

作者： Su, Qian Tan, Chao Dong, Feng Tianjin Univ Sch Elect Engn & Automat Key Lab Proc Measurement & Control Country Tianjin Peoples R China

ISBN: (纸本)9781467371896

Ultrasonic technology has potential application prospect in measurement of phase fraction in oil-water two-phase flow. An ultrasound attenuation method is discussed in the oil-water two-phase flow. Geometric simulation models of oil-water two-phase flow with different fractions are set up based on the finite element analysis method. Simulation results show that phase fraction and distribution jointly affect on the ultrasound attenuation coefficient. Test results give good agreement with the trend of the simulation results. The feasibility and effectiveness can be achieved to use the ultrasound attenuation testing method. This is a basic work for ultrasound attenuation method adopted to test the phase fraction of oil-water two-phase flow. A predicted model of phase fraction with different flow patterns can be effectively established combined with physically experimental data.

关键词： ultrasonic sensor oil-water two-phase flow phase fraction ultrasound attenuation flow parameter

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Measurement of Phase Fraction in Oil-Water Two-Phase flow Using Ultrasound Attenuation Method

Measurement of Phase Fraction in Oil-Water Two-Phase Flow Us...

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Chinese Automation Congress

作者： Qian Su Chao Tan Feng Dong Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University

ISBN: (纸本)9781467371902

关键词： Ultrasonic sensor Oil-water two-phase flow Phase fraction Ultrasound attenuation flow parameter

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An Inverse Technique for Evaluation of flow parameters of Modeling Materials Using Extrusion

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EXPERIMENTAL TECHNIQUES 2013年第2期37卷 16-22页

作者： Pathak, K. K. Soni, A. K. Sharma, M. Sahu, M. M. CSIR Adv Mat & Proc Res Inst Bhopal 462026 MP India LNCT Dept Mech Engn Bhopal MP India

Modeling materials such as plasticine are used for studying the hot deformation processes as their property can be easily correlated with hot metal. Being soft in nature, they take very less energy in forming as compared to real material. Hence flow behavior, surface roughness, and possible defects can be easily visualized using experimentation with modeling materials. However, being soft in nature, it is quite difficult to evaluate their flow properties. Neither tension nor compression test can be successfully attempted. To accurately determine the flow parameters, an inverse engineering technique which is based on elaborate analytical studies of rod extrusion process has been proposed. Using Sachs's analytical model and varying the material parameters, extrusion loads are evaluated for large number of conditions. Friction is also considered as variable. Material modeling is carried out using rate power law. Using these data, a contour map is generated to predict material and friction parameters for real experimental extrusion load. The proposed contour map is successfully validated for two plasticine experiments and found to be quite accurate. The proposed contour map offers a powerful tool to characterize modeling material using extrusion process which is otherwise not possible using conventional tension or compression tests.

关键词： Modeling Material flow parameter Extrusion Inverse Problem Methodologies Friction Material Characterization

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