Experimental Thermal and Fluid Science最新文献

{"title":"Transient freezing of water in a square channel: An experimental investigation","authors":"Bouke Johannes Kaaks,&nbsp;Danny Lathouwers,&nbsp;Jan-Leen Kloosterman,&nbsp;Martin Rohde","doi":"10.1016/j.expthermflusci.2025.111417","DOIUrl":"10.1016/j.expthermflusci.2025.111417","url":null,"abstract":"<div><div>This paper presents an experimental study for the transient growth of an ice layer in a square channel under laminar flow conditions and a mixed convection heat transfer regime. The ice layer was grown from a cold plate located at the bottom of the channel, capable of reaching temperatures between 0 and −20 °C. The onset of ice formation was marked by a sudden sharp increase of the cold plate temperature followed by a rapid spreading of the ice over the cold plate surface. This was attributed to subcooling effects within the thermal boundary layer of the flow. The flow field was measured using particle image velocimetry (PIV) and the ice profiles were measured at several instances of time after the onset of freezing by a visual tracing of the solid–liquid interface. In addition, a parametric study was performed regarding the effect of the cold plate temperature and the flow rate on the ice growth rate. Suitable approximations to the experimental boundary conditions were found after a detailed analysis of the cold plate’s transient temperature response, which could be readily implemented in numerical software. An important novelty of the present work is the measurement of the transient ice development of the ice-layer near the inlet of the channel, in addition to the centre of the channel where the flow is more developed. As such, a comprehensive and well-described experimental data set was generated for transient freezing in laminar internal flow. With this approach, a very good agreement was obtained between the experimental results and numerical simulations which were included to indicate the suitability of the current experimental campaign for numerical benchmarking purposes.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111417"},"PeriodicalIF":2.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Development of an advanced MEMS sensor for the simultaneous measurement of ion current and heat flux during flame–wall interactions","authors":"Kazuhito Dejima,&nbsp;Yoriaki Wakisaka,&nbsp;Tomoki Yokoyama,&nbsp;Kiyoshi Kawasaki,&nbsp;Koji Yamane","doi":"10.1016/j.expthermflusci.2025.111422","DOIUrl":"10.1016/j.expthermflusci.2025.111422","url":null,"abstract":"<div><div>Flame–wall interactions have been extensively investigated using optical diagnostic techniques or numerical simulations. However, these techniques tend to be costly and complex, making their application to actual combustor challenging. Therefore, a measurement technique that is easy to use and applicable to practical systems is required. In this study, a thin-film sensor for the simultaneous measurements of ion current and heat flux was developed using the micro-electro-mechanical systems (MEMS) technology. The MEMS sensor comprised two ion current sensors and a resistance temperature detector for evaluating flame behaviors and heat transfer during transient flame–wall interactions. The MEMS sensor was tested under a head-on quenching condition. Consequently, the ion current and heat flux were clearly measured. Compared with the flame images recorded by a high-speed camera, the ion current began to rise when the flame entered the flame-detectable zone (approximately 600 μm in this study) of the sensor and reached its peak when the flame was closest to the sensor. Subsequently, the ion current began to decrease and finally disappeared when the flame was completely quenched. In addition, the ion current and heat flux showed dispersions in their peak values and phases. Through the validation using simple numerical simulations, the reason for the dispersions was presumed to be the local heat release rate. The MEMS sensor detected the local ion current and heat flux. Therefore, it can be used to evaluate the near-wall characteristics of flame behaviors and heat transfer during flame–wall interactions.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111422"},"PeriodicalIF":2.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The regimes of drop vaporization in saturated conditions under low pressure","authors":"Antoine Courouble,&nbsp;Romuald Rullière,&nbsp;Jocelyn Bonjour","doi":"10.1016/j.expthermflusci.2025.111416","DOIUrl":"10.1016/j.expthermflusci.2025.111416","url":null,"abstract":"<div><div>This paper reports on a parametric study of the phenomenon of vaporization of drops deposited on a superheated wall in saturated low pressure conditions (i.e. close to the triple point pressure and in the absence of any non-condensable gas). The studied parameters were the surface temperature, the saturation pressure, the height of injection of the liquid forming the drop and the size of the injection needle. Three regimes of vaporization were observed : evaporation, rebound and boiling. The distinction between the regimes was based on the analysis of video sequences but also on the thermal signature of the process of vaporization as recorder by heat flux measurements performed by 25 heat flux sensors embedded in the heated wall.</div><div>The regime of evaporation is characterized by the progressive vaporization of the drop that keeps the shape of a spherical cap whose height and diameter decrease with time. The boiling regime may correspond to two different behaviors, both being characterized by the nucleation of a bubble inside the drop itself. In certain conditions, this bubble bursts in such a manner that the drop is atomized and many daughter drops are spread all over the heated wall (bursting bubble boiling behavior). Such burst is made possible by the large bubble diameters (up to several centimeters) that is typical of boiling at low pressure. In other conditions, the presence of the bubble slightly affects the overall phase change (soft bubble boiling) because the burst is not strong enough to disperse daughter drops. Lastly, the regime of rebound was observed only in a restricted range of operational conditions.</div><div>The time of vaporization obviously depends on the regime: the shorter times were recorded for the bursting bubble boiling behavior, owing to the dispersion of all small daughter drops that vaporize all over the surface. It was found to be longer for the behavior of soft bubble, and even longer for the regime of evaporation.</div><div>The conditions for the occurrence of the vaporization regimes were summarized on maps based on dimensionless parameters, namely the Weber number, the Ohnesorge number, a dimensionless heat flux and a dimensionless pressure.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111416"},"PeriodicalIF":2.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the characteristics of near-wall flow and instantaneous wall shear stress in front of wall-mounted cylinders","authors":"Qigang Chen (陈启刚) ,&nbsp;Dawei Zhang (张大伟) ,&nbsp;Zhongxiang Wang (王忠祥) ,&nbsp;Huilan Zhang (张会兰) ,&nbsp;Qiang Zhong (钟强)","doi":"10.1016/j.expthermflusci.2025.111424","DOIUrl":"10.1016/j.expthermflusci.2025.111424","url":null,"abstract":"<div><div>Characteristics of near-wall flow and instantaneous wall shear stress in front of wall-mounted cylinders are crucial for understanding the mechanism and correctly predicting the depth of local scour at piers. Here, the near-wall flow in front of circular and square cylinders mounted vertically in an open channel with Reynolds numbers from 9800 to 16,300 was measured via high-resolution particle tracking velocimetry (PTV). The instantaneous wall shear stress was obtained after determining the viscous sublayer thickness. The viscous sublayer, where the time-averaged streamwise velocity varies linearly along the wall-normal direction, is located below the downward flow, i.e., the turbulent horseshoe vortex, corner vortex, and jet-like reverse flow along the wall. Its thickness in the region below and away from the turbulent horseshoe vortices is thicker and thinner than that of uniform open channel flows, respectively. The instantaneous wall shear stress in the region dominated by the turbulent horseshoe vortex system exhibits a bimodal feature. The time-averaged wall shear stress is significantly amplified, with maximum magnification factors of approximately 2.5 and 4.0 in the flows upstream of the circular and square cylinders, respectively. Moreover, the corresponding turbulence intensities of the wall shear stress influenced by the turbulent horseshoe vortex in these two flows are approximately 2.0 and 5.5. The results indicate that the fluctuation of wall shear stress is crucial for correctly predicting the local scour at in-water cylinder structures such as bridge piers. However, the characteristics of wall shear stress are significantly different from those of turbulent open channel flows.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111424"},"PeriodicalIF":2.8,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coalescence position of two confined droplets with unequal lengths in microchannels","authors":"Wei Dong ,&nbsp;Yuqing Zhao ,&nbsp;Lei Tang ,&nbsp;Liangkang Xie ,&nbsp;Xiaoda Wang ,&nbsp;Wei Du","doi":"10.1016/j.expthermflusci.2025.111419","DOIUrl":"10.1016/j.expthermflusci.2025.111419","url":null,"abstract":"<div><div>The coalescence of two droplets with unequal lengths through a head-to-rear collision in the microchannel with a double T-junction is an important passive method to construct droplet reactors. However, the accurate prediction of the coalescence position is still not achievable. This work aimed to explore the coalescence position by analyzing the droplet dynamics. Firstly, the velocity variation of the paired droplets moving in a straight microchannel was analyzed to divide the whole process into several stages. Then, based on the experimental investigations, mathematical models were developed to describe the distances of the droplet-pairs moving in each stage to predict the coalescence position in the straight microchannel. In addition, the coalescence position, as well as the coalescence mechanism, was analyzed for the paired droplets in an expansion microchannel to explore the more possibilities of intensifying the construction of droplet reactors in microchannels.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111419"},"PeriodicalIF":2.8,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micro-PIV experimental measurements of vortex evolution inside generated droplets in T-inlet microchannel","authors":"Wang Cao ,&nbsp;Qingjun Yang ,&nbsp;Ruikai Guo ,&nbsp;Qi Mao","doi":"10.1016/j.expthermflusci.2025.111418","DOIUrl":"10.1016/j.expthermflusci.2025.111418","url":null,"abstract":"<div><div>The evolution of swirling intensity within droplets during the formation of squeezing microdroplets in T-inlet microchannel devices was experimentally investigated utilizing the microparticle image velocimetry (micro-PIV) technique. Swirling intensity is quantitatively characterized by defining the average rotational angular velocity of fluid units under shear-free conditions. The effects of the continuous phase capillary number and the dispersed phase flow velocity on the evolution of swirling intensity within the droplets were investigated experimentally. Experimental results indicate that the internal vortex evolution process of droplets during the formation of squeezing microdroplets can be categorized into four distinct phases. An increase in the capillary number of the continuous phase effectively shortens the microdroplet formation period while enhancing the recirculation swirling intensity within the droplets. Conversely, by adjusting the flow velocity of the dispersed phase fluid, variations in the droplet formation period can be achieved without altering the swirling intensity. These findings provide a theoretical foundation for improving mixing, mass and heat transfer processes within microdroplets.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111418"},"PeriodicalIF":2.8,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Local heat transfer approach to the start-up analysis of an ultra-thin loop heat pipe","authors":"Luca Pagliarini ,&nbsp;Kelvin G. Domiciano ,&nbsp;Larissa Krambeck ,&nbsp;Fabio Bozzoli ,&nbsp;Marcia B.H. Mantelli","doi":"10.1016/j.expthermflusci.2025.111421","DOIUrl":"10.1016/j.expthermflusci.2025.111421","url":null,"abstract":"<div><div>Loop heat pipes are two-phase, passive heat transfer devices that exhibit attractive features for thermal management applications, including micro-electronics and battery packs cooling. To enhance the modelling and optimization of such heat transfer devices, a better understanding of their working behaviour is needed, especially in terms of device response to start-up transients. To this aim, a novel local heat transfer approach is proposed and applied to the experimental investigation of a copper loop heat pipe partially filled with ethanol, whose ultra-thin layout has been specifically designed for embedment in electronic devices. The evaporator section is heated by means of an electrical resistance, while the condenser is cooled by free convection. The outer wall temperature along the whole condenser is monitored during the start-up phase of the device at varying heat loads through a medium-wave infrared camera. The temperature signals, referred to six wall sections, are post-processed by means of the Inverse Heat Conduction Problem resolution approach, resulting in the assessment of the heat fluxes exchanged between the working fluid and the device wall over time in both the vapor and liquid lines. The inverse method is successfully validated by means of synthetic data, whereas the experimental procedure is calibrated and verified by preliminary experimental tests. Start-up results show comparable trends in the wall-to-fluid heat flux profiles with the heat input, exhibiting peak values of about 2300 W/m². Through the present non-intrusive technique, fluid velocity in the vapour line is also estimated in the range 0.008 - 0.012 m/s. To the authors’ knowledge, this represents one of the first attempts of characterizing both local heat transfer quantities and inner fluid dynamics in loop heat pipes via experimental approaches.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111421"},"PeriodicalIF":2.8,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"An experimental study on the influence of variable film-hole diameter and arrangement on unsteady cooling performance","authors":"Liwei Ma,&nbsp;Xinyu Liu,&nbsp;Wenhao Guo,&nbsp;Jianhua Wang,&nbsp;Jian Pu,&nbsp;Ran Yao","doi":"10.1016/j.expthermflusci.2025.111415","DOIUrl":"10.1016/j.expthermflusci.2025.111415","url":null,"abstract":"<div><div>To reduce the unsteadiness and enhance the time-averaged film coverage performance, a novel conception of variable hole-diameter and arrangement is suggested. Five rows of film-holes with diameters ranging from 0.0020 m to 0.0038 m are embedded on a flat plate, including five kinds of arrangements. The effects of arrangement scheme, blowing ratio and plate thickness on the unsteadiness and time-averaged behaviors are experimentally investigated by time-resolved quantitative light sheet technique. The spatial modes of large-scale structures are analyzed by proper orthogonal decomposition analysis, and the flow field are characterized by momentum thickness and velocity distribution. The present work reveals two important and valuable phenomena: 1) For the thin plate (small length-to-diameter ratio, <em>L</em>/<em>D</em>), the arrangement of “hole-diameter from large to small” can achieve the highest time-averaged film coverage performance and the lowest unsteadiness than the other arrangements. 2) Compared with the thick plate (large <em>L</em>/<em>D</em>) with unchanged hole-diameter, the thin plates with the arrangements of “hole-diameter from large to small” and “small hole-diameter in the middle” can provide higher time-averaged performance and lower unsteadiness. This exploration may provide the investigators and designers of film cooling with a new thread.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111415"},"PeriodicalIF":2.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unsteady boundary-layer transition measurements with Temperature-Sensitive Paint under cryogenic conditions","authors":"Armin Weiss ,&nbsp;Christian Klein ,&nbsp;Ulrich Henne ,&nbsp;Anne Hebler","doi":"10.1016/j.expthermflusci.2025.111414","DOIUrl":"10.1016/j.expthermflusci.2025.111414","url":null,"abstract":"<div><div>The study presents the first measurement of boundary-layer transition on a harmonically-pitching airfoil under cryogenic conditions. The experiments were conducted in the cryogenic wind tunnel of the German–Dutch Wind Tunnels in Cologne using a test rig especially designed for harmonic pitch oscillations of a two-dimensional model equipped with the laminar NLF(2)-0415 airfoil. The tests were performed at free stream Reynolds and Mach numbers of <span><math><mrow><mi>R</mi><mi>e</mi><mo>=</mo><mn>6</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>6</mn></mrow></msup></mrow></math></span> and <span><math><mrow><mi>M</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>34</mn></mrow></math></span>. Unsteady pitch oscillations were investigated at different pitch frequencies (up to 40<!--> <!-->Hz, i.e. a reduced frequency of 0.540) and pitch amplitudes, as well as for a steady angle-of-attack polar for comparison. The boundary-layer transition movement was captured by means of spatially high-resolving temperature-sensitive paint using a surface-integrated heating layer of carbon nanotubes (cntTSP) and fast-response pressure transducers. The cntTSP data was processed according to the already established “Differential Thermography” (DT) method as well as using a recently presented method based on the evaluation of the qualitative distribution of the heat-transfer coefficient (HTC). The techniques are described in detail and results are evaluated with respect to measurement-based thermal hysteresis as well as the influence of varying pitch frequency and amplitude. The latter could successfully be measured by all applied methods. The findings further reveal significant improvements in the detection of unsteady boundary-layer transition when applying the HTC method compared to DT. These are: a reduction of the measurement error in terms of the thermal hysteresis component in the results and an increased result density at pitch phases, where the DT method inherently fails to yield results.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111414"},"PeriodicalIF":2.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Experimental study on the effectiveness of plasma energy deposition in controlling transverse jet","authors":"Ao Wang ,&nbsp;Zhi Chen ,&nbsp;Liming Feng ,&nbsp;Shunxin Qu ,&nbsp;Hao Ding ,&nbsp;Lifeng Tian","doi":"10.1016/j.expthermflusci.2025.111420","DOIUrl":"10.1016/j.expthermflusci.2025.111420","url":null,"abstract":"<div><div>In this paper, we carried out an experimental study on the control of transverse jet via plasma energy deposition in a Mach 2.5 wind tunnel. The actuator operates at a discharge frequency of 10 kHz, generating thermal block effects upstream of the jet. Time-resolved schlieren system with 50 kHz shooting frequency, as well as wall static pressure taps, was utilized to measure the dynamic flow with and without excitation. This research delves into the feasibility of plasma energy deposition on controlling the transverse jets with varying injection total pressure (0, 200, 300, 400 kPa). The pressure increment within cavity resulting from discharge exists in all cases, attributed to the combined effects of plasma-induced shock and jet entrainment. Instantaneous schlieren images and the statistical analysis of their datasets were employed to investigate the unsteady characteristics of the flow field. The results indicate that discharge significantly elevates the energy contribution of unsteady modes, inhibits the low-frequency oscillations of the bow shock, and modulates the dominant frequency of the jet vortex shedding mode. Moreover, the increase in jet vorticity can be ascribed to the deformation of the precursor shock and the Richtmyer–Meshkov instability around thermal bubble/bow shock interaction region. As injection total pressure increases, the triangular-like region formed by the large eddy-induced shock, reflected shock, and the jet moves upstream and shrinks, consequently curtailing the region where jet pulsations amplify. After passing through bow shock, the effect of precursor shock on regulating the flow dampens with increasing injection total pressure. However, even at an injection total pressure of 400 kPa, coherent structures downstream of the bow shock can still be detected, demonstrating the broad control range of plasma energy deposition.</div></div>","PeriodicalId":12294,"journal":{"name":"Experimental Thermal and Fluid Science","volume":"163 ","pages":"Article 111420"},"PeriodicalIF":2.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}