Flow Measurement and Instrumentation最新文献

{"title":"Three-phase flow measurement by dual-energy gamma ray technique and static-equivalent multi-phase flow simulator","authors":"Mohsen Sharifzadeh,&nbsp;Mojtaba Askari","doi":"10.1016/j.flowmeasinst.2024.102736","DOIUrl":"10.1016/j.flowmeasinst.2024.102736","url":null,"abstract":"<div><div>There is a strong desire to use three-phase flowmeters in upstream operations because of their small size, portability, and cost-effectiveness. Traditional three-phase flowmeterstypically employ two main strategies: fully separating the flow into liquid and gas streams and measuring them using common two- and single-phase meters, or simplifying the direct measurement requirements by homogenization.</div><div>In order to achieve accurate measurements with these meters, it is necessary to first create a suitable simulator for generating various multiphase flow regimes with minimal systematic error. Developing such a simulator on a laboratory scale, rather than using expensive test loops is a crucial and practical option.</div><div>In this research, SEMPF as a Static-Equivalent Multi-Phase Flow with flexibility in creating different multi-phase flow regimes is introduced. In the following, the mechanism of action is validated for both homogenous two- and three-phase mixtures by using dual-energy gamma ray attenuation technique in the Monte Carlo simulator environment. Finally, the three-phase component fraction measurement accuracy by dual-energy gamma meter in three different modes of gasoil-, water-, and air-continuous mixtures were investigated. The experimental results show the maximum accuracy of 2.03 %, 7.23 %, and 5.09 % for gasoil phase measurement in three different conditions that the carrier phase is air, gasoil and water respectively.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102736"},"PeriodicalIF":2.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of flow angle from measurements of vortex shedding frequency downstream of a triangular bluff model using a single-sensor hot-wire probe","authors":"Ehsan Ardekani,&nbsp;Foad Farhani,&nbsp;Mohammad Ali Ardekani","doi":"10.1016/j.flowmeasinst.2024.102731","DOIUrl":"10.1016/j.flowmeasinst.2024.102731","url":null,"abstract":"<div><div>Experimental aerodynamic studies often require precise measurements of flow angles. However, the conventional multi-hole probe is unsuitable for measuring small flow angles or for use under low-velocity conditions. To overcome these limitations, a new method has been proposed based on measuring the frequency of vortex shedding downstream of a non-polar symmetric body. This technique utilizes a single-sensor hot-wire probe to measure the frequency of the vortex shedding from an equilateral triangular model at different flow angles (<span><math><mrow><mi>α</mi><mo>)</mo></mrow></math></span> by rotating the model using a rotating mechanism. Subsequently, the Strouhal number (St) is determined for each flow angle from the measured vortex shedding frequencies. An empirical correlation is then obtained between the Strouhal number and the flow angle of the form <span><math><mrow><mi>α</mi><mo>=</mo><msup><mi>f</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup><mrow><mo>(</mo><mrow><mi>S</mi><mi>t</mi></mrow><mo>)</mo></mrow></mrow></math></span>, considering the condition where the Strouhal number is solely a function of the flow angle. The range of flow angles for which the proposed method is applicable, along with acceptable repeatability of the vortex shedding frequency and suitable Strouhal number sensitivity to the variations in the flow angle, was determined. An empirical correlation <span><math><mrow><mi>α</mi><mo>=</mo><mo>−</mo><mn>4153.4</mn><msup><mrow><mi>S</mi><mi>t</mi></mrow><mn>2</mn></msup><mo>−</mo><mn>1819.9</mn><mi>S</mi><mi>t</mi><mo>+</mo><mn>189.51</mn></mrow></math></span> was established, which can be used to determine flow angles in the range of ±10° with an accuracy of 1°. For this purpose, the triangular model is fixed at an angle of 33° to the principal coordinates. The probe is positioned downstream of the model in the defined range: <span><math><mrow><mn>3</mn><mo>≤</mo><mi>x</mi><mo>/</mo><mi>a</mi><mo>&lt;</mo><mn>25</mn></mrow></math></span>, <span><math><mrow><mn>4.5</mn><mo>≤</mo><mi>y</mi><mo>/</mo><mi>a</mi><mo>≤</mo><mn>5.1</mn></mrow></math></span>, where <span><math><mrow><mi>a</mi></mrow></math></span> is the side of the equilateral triangular model, and <span><math><mrow><mi>x</mi></mrow></math></span> and <span><math><mrow><mi>y</mi></mrow></math></span> are probe distances in the flow and perpendicular to the flow direction.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102731"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A binary gas concentration and flow rate measurement system based on scandium-doped aluminum nitride piezoelectric micromachined ultrasonic transducers","authors":"Hanzhe Liu ,&nbsp;Yuzhe Lin ,&nbsp;Guoqiang Wu ,&nbsp;Jifang Tao","doi":"10.1016/j.flowmeasinst.2024.102724","DOIUrl":"10.1016/j.flowmeasinst.2024.102724","url":null,"abstract":"<div><div>This paper presents an ultrasonic binary gas concentration and flow rate measurement system (UBCFS) based on a scandium-doped aluminum nitride (Sc<span><math><mrow><mn>0</mn><mo>.</mo><mn>2</mn></mrow></math></span>Al<span><math><mrow><mn>0</mn><mo>.</mo><mn>8</mn></mrow></math></span>N) piezoelectric micromachined ultrasonic transducer (PMUT) array, enabling the simultaneous measurement of binary gas concentration and flow rate. The ultrasonic propagation time method is employed to determine binary gas concentration and flow rate. To assess the feasibility of the proposed UBCFS, it is integrated into an experimental setup composed of nitrogen (N₂) and argon (Ar) gas paths. Results indicate that the reported UBCFS measures both gas concentration and flow rate with high accuracy and repeatability. For binary gas flow rate measurements, the mean error and repeatability error are below 0.403% and 0.667%, respectively, across all binary gas concentrations. Within the concentration range of 0% to 100%, the minimum mean error and repeatability error for concentration measurements are 0.03% and 0.04%, respectively, which is almost unaffected by gas flow rate. The performance of the proposed UBCFS based on PMUT arrays surpasses that of most reported or commercialized devices. The compact, cost-effective, and highly reliable UBCFS provides a feasible solution for portable equipment utilized in binary gas detection and control in semiconductor processing.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102724"},"PeriodicalIF":2.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and calibration of a low-cost LIDAR sensor for water level measurements","authors":"Vinícius Diniz Ferrer Santana ,&nbsp;Rogério Esteves Salustiano ,&nbsp;Rafael de Oliveira Tiezzi","doi":"10.1016/j.flowmeasinst.2024.102729","DOIUrl":"10.1016/j.flowmeasinst.2024.102729","url":null,"abstract":"<div><div>Environmental disasters increase along with disorganized urban growth and irresponsible exploitation of natural resources. The recurrence of hydrological disasters in the municipality of Poços de Caldas (Minas Gerais, Brazil), combined with the geomorphological specificities of the region, result in a demand for an in-depth analysis related to intense precipitation, considering its characteristics and consequences. This study presents a comparative analysis between a linigraph and a laser sensor for fluviometric measurement, pointing out the main differences, similarities, advantages and disadvantages of both systems. The values obtained by the low-cost LIDAR sensor were in agreement with those achieved using the linigraph, which is more expensive, thus demonstrating that the laser sensor can also replace it due to both installation and usage advantages. The laser sensor showed an accuracy of ±0.05 m relative to a metric physical scale, which is considered suitable for applications involving water level measurements in water bodies.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102729"},"PeriodicalIF":2.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation analysis and optimization of pilot type electro-hydraulic proportional directional valve based on multi field coupling","authors":"Meisheng Yang ,&nbsp;Kun Lian ,&nbsp;Shuang Luo ,&nbsp;Chixiang Yu","doi":"10.1016/j.flowmeasinst.2024.102726","DOIUrl":"10.1016/j.flowmeasinst.2024.102726","url":null,"abstract":"<div><div>The pilot-operated electro-hydraulic proportional directional valve is widely used in complex and precision engineering fields. Its operational stability and reliability determine the overall performance of the hydraulic system. During the working process of the pilot-operated electro-hydraulic proportional directional valve, the spool is deformed due to the influence of pressure and temperature, resulting in problems such as clamping or stagnation. In order to solve this problem, this study uses the fluid-solid-thermal coupling simulation method to analyze the flow field characteristics and thermal deformation of the spool with different structural throttling grooves, and optimizes the U-shaped throttling groove structure. The results indicate that as the valve opening increases, the front section of the throttling groove becomes the primary region where the maximum radial deformation of the spool occurs. In this paper, the steady-state flow force of the valve core is taken as the measurement standard, the constraint range of the structural parameters is determined, and the radial thermal deformation is included in the optimization analysis of the structural size. It's verified that the optimized flow characteristics are improved by about 32 % compared with that before optimization, and the maximum steady-state flow force after considering thermal deformation is reduced by about 4N compared with that before optimization. This provides an important design basis and reference for the structural design and optimization of the pilot electro-hydraulic proportional directional valve.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102726"},"PeriodicalIF":2.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation on cavitation erosion and evolution of choked flow in a tri-eccentric butterfly valve","authors":"Xinliang Yang ,&nbsp;Yanjun Lü ,&nbsp;Le Xu ,&nbsp;Yushan Ma ,&nbsp;Ruibo Chen ,&nbsp;Xiaowei Zhao","doi":"10.1016/j.flowmeasinst.2024.102725","DOIUrl":"10.1016/j.flowmeasinst.2024.102725","url":null,"abstract":"<div><div>The tri-eccentric butterfly valve is widely utilized in the petrochemical, nuclear, and metallurgy industries due to its robust sealing performance and great pressure resistance. When the local static pressure is lower than the saturation vapor pressure, the fluid phase is transformed into vapor, and cavitation occurs. Cavitation intensifies and the bubbles generated by cavitation severely hinder the flow when the inlet pressure remains constant and the outlet pressure further decreases. This phenomenon is known as choked flow. Choked flow is a derivative phenomenon of cavitation, which seriously threatens the lifetime of valves and the safety of the operation system. In this paper, a multiphase flow of the tri-eccentric butterfly valve is modeled to investigate the choked flow characteristics. The numerical results based on the proposed model are in good agreement with the experiments. The effect of the pressure drop on the mass flow rate and flow coefficient is studied and the liquid pressure recovery factor of the tri-eccentric butterfly is determined at the certain valve opening degree based on the Schnerr and Sauer cavitation model. The relationship between the pressure ratio and choked flow is studied by pressure and velocity contours. The susceptible erosion locations and primary causes of erosion for the tri-eccentric butterfly valve at the certain valve opening degree are investigated. By comparison of the distribution of the vapor volume fraction and vortex structures, the spatial correlation between vortex and choked flow is revealed. Meanwhile, the effect of the pressure ratios on the average vapor volume fraction at 70 % and 100 % valve opening degrees is studied. The evolution of choked flow in the tri-eccentric butterfly is revealed and the cause of choking is pointed out.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102725"},"PeriodicalIF":2.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of a Contactless Inductive Flow Tomography system for a large Rayleigh–Bénard convection cell with aspect ratio Γ=0.5","authors":"R. Mitra,&nbsp;M. Sieger,&nbsp;V. Galindo,&nbsp;T. Vogt,&nbsp;F. Stefani,&nbsp;S. Eckert,&nbsp;T. Wondrak","doi":"10.1016/j.flowmeasinst.2024.102709","DOIUrl":"10.1016/j.flowmeasinst.2024.102709","url":null,"abstract":"<div><div>Contactless Inductive Flow Tomography (CIFT) is a flow measurement technique that is able to reconstruct the time-dependent three-dimensional velocity field in electrically conducting fluids, e.g., liquid metals, from magnetic field measurements. The paper describes the design of a specific CIFT measurement set-up for flow studies in liquid metal Rayleigh–Bénard convection (RBC) in a large cylinder of aspect ratio (diameter/height) of <span><math><mrow><mi>Γ</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>5</mn></mrow></math></span> filled with the ternary alloy GaInSn as model fluid. An optimized configuration for the CIFT excitation system and magnetic field sensor layout under consideration of the specific requirements for the application in turbulent RBC is determined by numerical simulations. The new experimental CIFT-RBC system resulting from the design process is constructed and a preliminary experiment at a Rayleigh number of <span><math><mrow><mi>R</mi><mi>a</mi><mo>=</mo><mn>2</mn><mo>.</mo><mn>13</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>7</mn></mrow></msup></mrow></math></span> and a Prandtl number of <span><math><mrow><mi>P</mi><mi>r</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>03</mn></mrow></math></span> is performed and evaluated.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102709"},"PeriodicalIF":2.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on adaptive damper based on cone-slide valve combination regulation principle","authors":"Fei Xue,&nbsp;Shifang Yuan,&nbsp;Yingnan Shen,&nbsp;Rui Su,&nbsp;Xin Fu,&nbsp;Ning Xu","doi":"10.1016/j.flowmeasinst.2024.102722","DOIUrl":"10.1016/j.flowmeasinst.2024.102722","url":null,"abstract":"<div><div>In the wet process of semiconductor manufacturing, the high reliability and safety of the liquid supply system are crucial. The pulsation of liquid output from bellows pumps can cause pipeline vibrations, leading to reduced system lifespan and reliability, potential component damage, and ultimately decreased process yield. To address this issue, this paper proposes an adaptive damper based on a combination of cone-slide valve regulation, specifically designed to mitigate pulsations in the liquid supply system. By establishing a mathematical model of the damper, we investigated the parameters affecting its pulsation absorption rate and response characteristics, and developed a prototype. Experimental results indicate that increasing the gas chamber volume and reducing the stiffness of the bellows significantly enhance the damper pulsation absorption rate. The effective flow area of the control valve influences the response characteristics of the system. The damper demonstrates excellent pulsation suppression performance with varied system pressure and input flow rates. The proposed design method and damper model are experimentally validated, providing a theoretical foundation and technical support for optimizing liquid supply systems in semiconductor wet processes.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102722"},"PeriodicalIF":2.3,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation analysis and experimental research on static performance of water-hydraulic pressure difference control valve","authors":"Yong Yang ,&nbsp;Zengmeng Zhang ,&nbsp;Yunrui Jia ,&nbsp;Tingyu Geng ,&nbsp;Weiling Xu ,&nbsp;Kang Zhang","doi":"10.1016/j.flowmeasinst.2024.102723","DOIUrl":"10.1016/j.flowmeasinst.2024.102723","url":null,"abstract":"<div><div>Many hydraulic tools, like hydraulic cylinders and hydraulic artificial muscle joints are operated by adjusting pressure differences between different zones. Typically, the method employed to change the pressure difference is establishing hydraulic bridges and adjusting liquid resistance. While effective, this method's drawback is complex structures. To address this issue, a water-hydraulic pressure difference control valve, integrating two hydraulic bridges, was designed. The static performances including the output pressure difference, the flow rate and the force acting on the valve core were analyzed using AMESim and computational fluid dynamics simulations. Based on the simulation results, a prototype of voice coil motor direct drive pressure difference control valve was manufactured and the corresponding experiments were carried out. The computational fluid dynamics simulation results show that the internal leakage and the through-flow capacity difference between throttling grooves affect the flow field characteristics of the valve. When the pump pressure is 3 MPa and the valve opening is at the middle position, the internal leakage increases the flow rate from 2.25 L/min to 2.38 L/min, and the through-flow capacity difference reduces the control port pressure from the theoretical analysis of 1.5 MPa–1.41 MPa. Furthermore, combined with the analysis of the external liquid resistance, the AMESim model of the pressure difference control valve is modified. When the pump pressure is 3 MPa, the pressure difference and flow rate average deviations between the modified AMESim model and the experiment are 0.021 MPa and 0.048 L/min. Finally, a rotational angle experiment for a water hydraulic artificial muscle joints showed satisfactory control effects, suggesting the valve's application in controlling hydraulic tools and actuators.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102723"},"PeriodicalIF":2.3,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of empirical models for the modular limit of trapezoidal and triangular throat flumes","authors":"Hossein Soltani Kazemi ,&nbsp;Mohsen Solimani Babarsad ,&nbsp;Mohammad Hossein Pourmmohamadi ,&nbsp;Hossein Eslami ,&nbsp;Hossein Ghorbanizadeh Kharazi","doi":"10.1016/j.flowmeasinst.2024.102721","DOIUrl":"10.1016/j.flowmeasinst.2024.102721","url":null,"abstract":"<div><div>One of the essential challenges of flow measurement using the flume structure is whether the flow is free or submerged. Therefore, determining the free-submerged flow boundary is a vital topic. This study experimentally investigates the modular limit/threshold submergence of two kinds of flumes: trapezoidal throat flume (TraTF) and triangular throat flume (TriTF). To this end, the general form of empirical models of the flumes' modular limit index was presented based on dimensional analysis and incomplete self-similarity theory. Then, a set of experimental data was collected. In the next step, empirical relationships were developed using non-linear multivariate regression. The experimental modeling was done in a channel that was 20 m long, 0.6 m wide, and 0.5 m high. A total of 271 tests were conducted, examining nine flumes with trapezoidal throats and four with triangular throats at various flow rates. The TraTF formula has been developed, with 98 % of its predictions having an error of less than 10 % and an average error of 3 %. For the TriTF formula, 96 % of its predictions have an error of less than 10 %, and the average error is 3.6 %.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"100 ","pages":"Article 102721"},"PeriodicalIF":2.3,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}