International Journal of Thermofluids最新文献

{"title":"Entropy generation analysis of unsteady MHD nanofluid flow in a porous pipe","authors":"Feda A. Zahor ,&nbsp;Reema Jain ,&nbsp;Ahmada O. Ali ,&nbsp;Verdiana Grace Masanja","doi":"10.1016/j.ijft.2024.100907","DOIUrl":"10.1016/j.ijft.2024.100907","url":null,"abstract":"<div><div>This article presents a numerical investigation into the entropy production of nanofluids flowing through a porous medium in a permeable conduit, focusing on water-based solutions containing Titanium Carbide (TiC) and Silicon Carbide (SiC) nanoparticles. These nanoparticles are selected for their heat transfer properties. The flow system's governing equations are developed and solved using the Runge-Kutta-Fehlberg method. The study examines the influence of key nondimensional parameters, including the solid volume fraction of nanoparticles, radiation parameters, and Reynolds number, on temperature, velocity profiles, and entropy generation. The results show that Silicon Carbide-water nanofluids perform efficiently in terms of heat transfer and entropy minimization. Additionally, Silicon Carbide exhibits low skin friction at the pipe wall, with this effect increasing as the solid volume percentage of nanoparticles rises. The study also indicates that irreversibility due to heat transfer becomes more significant near the pipe wall as the solid volume fraction decreases and increases with higher radiation parameters and Reynolds number. These findings are presented graphically and in tabular form to illustrate the physical significance of the problem.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100907"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of thermal properties of ethylene glycol-based Williamson hybrid-nanofluid over stretchable/shrinking flat plate and their effects on solar panels","authors":"L.O. Aselebe ,&nbsp;A.T. Adeosun ,&nbsp;K.B. Kasali ,&nbsp;B.M. Yisa ,&nbsp;K.A. Salaudeen ,&nbsp;R.O. Adesina","doi":"10.1016/j.ijft.2024.100892","DOIUrl":"10.1016/j.ijft.2024.100892","url":null,"abstract":"<div><div>The global requirement for sustainable energy supply to enhance industrial productivity and reduce production costs has focused researchers’ attention to renewable energy in recent years. Solar energy mitigates the dangers connected with the use of fossil fuels in electricity generation. This work is set to evaluate the heat transmission capacities of Williamson hybrid nanofluid flow across a flat plate with viscous dissipation and heat source. The mathematical model explaining the flow interaction of Williamson hybrid nanofluid, combining viscous dissipation, heat source, and temperature-variation thermal conductivity and viscosity, is created using conservation laws. The specified system of non-linear coupled partial differential equations undergoes non-similarity transformation. The resulting non-dimensional model is solved using the bivariate spectral weighted residual method. The accuracy of the method is proven by comparing obtained results with those in the literature, and a good agreement is observed. Graphs are utilized to explain the thermophysical properties that are being considered. The results show that the fluid temperature rises when there is a source of heating and viscous dissipation. The velocity and the fluid parameter <span><math><mrow><mo>(</mo><mi>W</mi><mi>e</mi><mo>)</mo></mrow></math></span> have an inverse connection, whereas the temperature of the fluid has the opposite impact. Moreover, when nanoparticles are present, the thermal boundary layer rises along with the nanoparticles, thickening the velocity boundary layer and decreasing fluid velocity. Findings also show that for the <span><math><mrow><mi>V</mi><mi>d</mi><mo>∈</mo><mrow><mo>[</mo><mn>0</mn><mo>.</mo><mn>1</mn><mo>,</mo><mn>0</mn><mo>.</mo><mn>5</mn><mo>]</mo></mrow></mrow></math></span>, the skin drag force and Nusselt number retard by <span><math><mrow><mn>0</mn><mo>.</mo><mn>64</mn><mtext>%</mtext><mo>,</mo><mn>14</mn><mo>.</mo><mn>06</mn><mtext>%</mtext></mrow></math></span> for the shrinking sheet and <span><math><mrow><mn>0</mn><mo>.</mo><mn>21</mn><mtext>%</mtext><mo>,</mo><mn>6</mn><mo>.</mo><mn>57</mn><mtext>%</mtext></mrow></math></span> for the stretching sheet respectively. In the same vein, an 100% surge in the porosity parameter escalate the skin friction coefficient by 19.13% and 26.91% and the Nusselt number by 4.92% and 2.06% respectively for both the contracting and elastic sheet. The findings in the research will provide more insight in the design and improvement of solar panel plate efficiency.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100892"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of the use of metal–oxide and boron-based nanoparticles on the performance in a photovoltaic thermal module (PV/T): Experimental study","authors":"Muhyeddin Dalmış ,&nbsp;Ali Etem Gürel ,&nbsp;Gökhan Yıldız ,&nbsp;Alper Ergün ,&nbsp;Ümit Ağbulut","doi":"10.1016/j.ijft.2024.100910","DOIUrl":"10.1016/j.ijft.2024.100910","url":null,"abstract":"<div><div>Renewable energy sources are constantly on the agenda because the fossil fuels used are limited and the need for energy is constantly increasing. Among these resources, solar energy stands out because it is clean and endless energy. Nowadays, heat energy and electrical energy production from solar energy are quite common. Photovoltaic (PV) solar panels can convert a limited portion of the solar energy falling on them into electrical energy. In PV panels, heat energy that cannot be converted into electricity is discharged back to the external environment. Photovoltaic thermal (PV/T) panels are used to remove this heat from the system and convert it into useful energy. Many cooling techniques are applied to reduce the surface temperature of PV/T panels and increase their electrical efficiency. One of these techniques is liquid-cooled PV/T panels. In some of the studies, forced circulation (using a pump) and in others natural circulation (thermosiphon effect) were applied. In this study, a natural circulation indirect heated PV/T system was designed. Al₂O₃, ZnO, and BN nanoparticle concentrations were added to the cooling water to increase heat transfer within the PV/T panel. According to the experimental results, using nanofluid in the PV/T panel increased the thermal and total efficiency. Total efficiencies of ZnO, BN, and Al₂O₃ were obtained as 52.8 %, 47.86 %, and 43.49 %, respectively, at 0.03 concentration. The highest exergy efficiency and sustainability index were determined as 17.155 % and 1.207, respectively, at 0.03 concentration of ZnO nanofluid.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100910"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Moderate or Intense Low-Oxygen Dilution (MILD) combustion regime: An overview on fuels","authors":"Amir Mardani ,&nbsp;Amir A. Beige ,&nbsp;Kyung Chun Kim","doi":"10.1016/j.ijft.2024.100905","DOIUrl":"10.1016/j.ijft.2024.100905","url":null,"abstract":"<div><div>In this paper, an overview on the used fuels in Moderate or Intense Low-oxygen Dilution (MILD) combustion is provided including gaseous, liquid, and solid fuels in addition to fuel mixtures. In the first step, a detailed review of the definitions of this combustion regime is presented and the known different oxidation routes are explained. Next, various issues including emissions, combustion fields, and kinetics are addressed for the studied fuels in the summarized studies, followed by a comparison of the fuels in terms of emissions and combustion fields. In addition, these studies are summarized in terms of the utilized fuels and the selected experimental and numerical approaches to give an overall view on the chosen fuels in MILD regime. Finally, future prospects and directions on using fuel technologies in MILD combustion are provided, which includes the known obstacles in using different fuels under MILD regime.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100905"},"PeriodicalIF":0.0,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive CFD Analysis of Base Pressure Control Using Quarter Ribs in Sudden Expansion Duct at Sonic Mach Numbers","authors":"Ambareen Khan ,&nbsp;Abdul Aabid ,&nbsp;Sher Afghan Khan ,&nbsp;Mohammad Nishat Akhtar ,&nbsp;Muneer Baig","doi":"10.1016/j.ijft.2024.100908","DOIUrl":"10.1016/j.ijft.2024.100908","url":null,"abstract":"<div><div>This study aims to assess the effect of rib size, shape, and location in a suddenly expanded flow at sonic Mach number. Flow from a converging nozzle is exhausted into a larger area of duct diameter of 18 mm. The geometric parameters considered are the area ratio, duct length, rib radius, and inertia parameters, which are considered the level of expansion at critical Mach number. In the present study, duct lengths were from 1D to 6D, rib radii considered were 1 mm to 3 mm, and rib locations were 0.5D, 1D, 1.5D, 2D, and 3D. Results show that when the ribs are placed near the reattachment point with a 3 mm radius, they are efficient and capable of reducing the suction in the recirculation zone and the base pressure, which was lower than the ambient pressure in the absence of ribs, is assorted larger than the back pressure. If the requirement is to equate the pressure at the base to ambient pressure, then a 2 mm radius is the right choice. Furthermore, the 1 mm rib cannot reduce the suction in the base region, and base pressure remains sub-atmospheric for the entire range of rib locations, as well as the NPRs of the present study. When the orientation of the ribs is changed, and the flow interacts with the flat surface instead of the curved surface, there is a marginal change in the flow pattern, and there is no significant change in the base pressure values.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100908"},"PeriodicalIF":0.0,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heat transfer characteristics of a turbulent swirl jet issuing from a circular nozzle","authors":"Vivek Mathew Jose","doi":"10.1016/j.ijft.2024.100906","DOIUrl":"10.1016/j.ijft.2024.100906","url":null,"abstract":"<div><div>Experimental and numerical studies on the flow field and cooling performance of a swirling jet, impinging on a flat surface is presented. A new nozzle that resembles the swirl injector of a liquid propellant rocket engine is used. This study considers different parameters including swirl number(S), Reynolds number(<em>Re</em>), normalised orifice to target spacing (Z/D) and confinement. The performance of various RANS and LES turbulence models is assessed using the data obtained from present experimental studies and that reported in literature. RNG k-ϵ turbulent model is successful in predicting heat transfer in non swirling flow. In the case of swirling flow, LES WALEM(Wall Adapting Local Eddy viscosity Model) predicts the heat transfer better than the other models. The performance of Swirling Impinging Jets(SIJ) and Cylindrical Impinging Jets (CIJ) is compared. At higher Z/D, introduction of swirl results in reduction in heat transfer and this is because of the increased spreading of the jet and reduction in velocity of the jet impinging on the target. Better performance is achieved at lower Z/D when a cylindrical jet is introduced with a small amount of swirl. For Z/<em>D</em> = 2 and <em>S</em> = 0.2, the peak Nu increases by 10 % and average Nu in the stagnation region increases by 6 % in comparison to CIJ. The position of the peak Nu moves away from the axis of the jet and there is better uniformity in Nu in the stagnation region. For Z/<em>D</em> = 2 swirling flow creates secondary peak(which usually occurs at high <em>Re</em>)even at low <em>Re</em>. At very low Z/D, top wall confinement causes increase in both peak heat transfer and average heat transfer in the stagnation region.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100906"},"PeriodicalIF":0.0,"publicationDate":"2024-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation approaches for the study of the oil flow rate distribution in lubricating systems with rotating shafts","authors":"Massimo Rundo ,&nbsp;Paola Fresia ,&nbsp;Paolo Casoli","doi":"10.1016/j.ijft.2024.100904","DOIUrl":"10.1016/j.ijft.2024.100904","url":null,"abstract":"<div><div>This study addresses the issue of predicting the distribution of lubricant flow through the outlets of a rotating shaft used in vehicle power transmission. A typical geometry with closely spaced rows of holes, suitable for the lubrication of multi-disk clutches, was considered. Both lumped parameter and computational fluid dynamics approaches were applied and compared. The test rig for model validation was designed with a variable speed shaft featuring an axial oil inlet and three equally spaced pairs of radial outlet holes. The main characteristic of the experimental facility is the possibility to selectively measure the flow rates through each outlet. It was found that the three-dimensional model based on the multiple reference frame approach provides a reliable prediction of how the flow rate is distributed. Generally, the flow rate is lower through the outlet closest to the inlet and is maximum at the farthest exit. The flow distribution is minimally affected by the shaft speed. The influence of geometric parameters on making the flow distribution more uniform was studied. It was found that a better flow balance is obtained with a low ratio between the diameter of the radial holes and that of the axial channel. The results obtained offer best-practice guidelines for accurately simulating comparable systems, in order to optimize reliability of the mechanical transmission and energy efficiency of the flow generation unit.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100904"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a two-stage thermoacoustic refrigerator prototype","authors":"Samir Gh. Yahya ,&nbsp;Ahmed Hamood ,&nbsp;Artur J. Jaworski ,&nbsp;Xiaoan Mao","doi":"10.1016/j.ijft.2024.100903","DOIUrl":"10.1016/j.ijft.2024.100903","url":null,"abstract":"<div><div>A traveling-wave thermoacoustic refrigerator is a potential cooling option for electronics enclosures. The main advantage of this type of refrigerator is the lack of moving parts, which makes it a maintenance-free application. The design and laboratory implementation of a travelling-wave thermoacoustic refrigerator is studied and presented in this paper. The matching between the thermoacoustic refrigerator and a pair of linear motors is investigated. A model of the refrigerator was first developed via DeltaEC simulations and then validated experimentally. A final configuration comprising of a two-stage refrigerator driven by two linear motors is presented. The model of the refrigerator runs at a frequency of 60 Hz, and it is able to generate a cooling power of 446 W at a cooling temperature of 0 °C. The setup and instrumentation of the apparatus is explained in detail. Experimentally, the refrigerator's maximum cooling load was 298 W, and the lowest cooling temperature achieved was -0.2 °C. At the maximum cooling power, the COP is 2.35.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100903"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of thermal radiation and inclined magnetic field on thermosolutal mixed convection in a partially active wavy trapezoidal enclosure filled with hybrid nanofluid","authors":"Samrat Hansda","doi":"10.1016/j.ijft.2024.100888","DOIUrl":"10.1016/j.ijft.2024.100888","url":null,"abstract":"<div><div>This work focuses on the examination of the magneto-thermosolutal convection in a lid-driven wavy trapezoidal enclosure in the presence of thermal radiation. The wavy cavity is filled with radiative Fe₃O₄-Cu-H₂O hybrid nanoliquid. In this work, two cases are considered depending on the location of heat and concentration sources. A portion of the vertical walls are kept hot and in high concentration while the remaining parts are in adiabatic condition. The adiabatic flat upper lid is moving towards the right with equal speed. In addition, the lower wavy border is cold and low concentration. The governing Navier–Stokes equations are modeled to describe thermosolutal phenomena within the wavy enclosure. These equations are solved by reconstructing a recently developed compact scheme. Computed outcomes are presented in terms of streamlines, isotherms, iso-concentrations, average Nusselt and Sherwood numbers to evoke the thermosolutal phenomena for various physical parameters. Also, computing in-house code is validated with the published numerical and experimental and literatures. This investigation surveys the roles of several well-defined parameters such as Richardson number (<span><math><mrow><mi>R</mi><mi>i</mi></mrow></math></span>), Lewis number (<span><math><mrow><mi>L</mi><mi>e</mi></mrow></math></span>), Buoyancy ratio number (<span><math><mi>N</mi></math></span>), Radiation parameter (<span><math><mrow><mi>R</mi><mi>d</mi></mrow></math></span>), Hartmann number (<span><math><mrow><mi>H</mi><mi>a</mi></mrow></math></span>), inclination of angle (<span><math><mi>γ</mi></math></span>), undulation of the wavy surface (<span><math><mi>d</mi></math></span>) and solid volume fraction (<span><math><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>h</mi><mi>n</mi><mi>p</mi></mrow></msub></math></span>) of the hybrid nanofluid. An increase in the Lewis number (<span><math><mrow><mi>L</mi><mi>e</mi></mrow></math></span>) enhances species diffusion within the system but diminishes thermal transport. This work reveal that a change in <span><math><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>h</mi><mi>n</mi><mi>p</mi></mrow></msub></math></span> from 0% to 4%, heat transfer is upgraded up to 4.28% in Case I and 3.93% in Case II while mass transfer is declined by 2.24% in Case I and 1.60% in Case II. Results indicate that Case I performed better than Case II in the case of energy and solutal transfer. This work has many practical applications such as heat exchangers, electronic device cooling, food processing and porous industrial processes.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100888"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Renewable energy technology diffusion model: Evaluation of financial incentives in the electricity market of ecuador","authors":"Fran Zhovani Reinoso-Avecillas ,&nbsp;Faustino Moreno-Gamboa ,&nbsp;César Nieto-Londoño","doi":"10.1016/j.ijft.2024.100884","DOIUrl":"10.1016/j.ijft.2024.100884","url":null,"abstract":"<div><div>This paper develops a simulation model using the System Dynamics paradigm to evaluate the effect of applying financial incentives on the diffusion of non-conventional renewable energy technologies in the Ecuadorian electricity market. The barriers to the diffusion of renewable energies are studied, the diffusion models are characterised, and the model is built with market variables and financial indicators integrated into its base structure. The Ecuadorian electricity market is described as a case study focusing on the incentive scheme. Based on investment, generation, and indirect incentives, this scheme plays a crucial role in promoting renewable energy technologies. Different long-term diffusion scenarios are simulated and compared with each other and with the baseline scenario to obtain diffusion rates and financial information for five renewable generation technologies: non-conventional hydro, wind, solar photovoltaic, biomass, and geothermal. The results of the simulations show that the combination of incentives leads to high diffusion rates, reassuring the audience about the potential impact of the proposed model. However, the feed-in tariff and tradable green certificate incentives are the most effective in promoting the use of renewable energy. For the Ecuadorian electricity market, the results show that wind and biomass technologies would be the most profitable, as opposed to geothermal energy, whose diffusion will not be feasible within the simulated period.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"24 ","pages":"Article 100884"},"PeriodicalIF":0.0,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}