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Three-Dimensional Numerical Investigation of the Separation Process in a Vortex Tube at Different Operating Conditions

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Journal of Marine science and Application 2016年第2期15卷 157-165页

作者： Seyed Ehsan Rafiee M.M. Sadeghiazad department of Mechanical engineering Urmia University of Technology Urmia P.O. Box 57155-419 Iran

Air separators provide safe, clean, and appropriate air flow to engines and are widely used in vehicles with large engines such as ships and submarines. In this operational study, the separation process in a Ranque-Hilsch vortex tube cleaning （cooling） system is investigated to analyze the impact of the operating gas type on the vortex tube performance; the operating gases used are air, nitrogen, oxygen, carbon dioxide and nitrogen dioxide. The computational fluid dynamic model used is equipped with a three-dimensional structure, and the steady-state condition is applied during computations. The standard k-c turbulence model is employed to resolve nonlinear flow equations, and various {2. parameters, such as hot and cold exhaust thermal drops, and power separation rates, are described numerically. The results show that nitrogen dioxide creates the greatest separation power out of all gases tested, and the numerical results are validated by good agreement with available experimental data. In addition, a comparison is made between the use of two different boundary conditions, the pressure-far-field and the pressure-outlet, when analyzing complex turbulent flows in the air separators. Results present a comprehensive and practical solution for use in future numerical studies.

关键词： vortex tube air separator separation process operatinggas numerical simulation

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The Tianlai Cylinder Pathfinder array: System functions and basic performance analysis

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science China(Physics,mechanics & Astronomy) 2020年第12期63卷 2-28页

作者： JiXia Li ShiFan Zuo FengQuan Wu YouGang Wang JuYong Zhang ShiJie Sun YiDong Xu ZiJie Yu Reza Ansari YiChao Li Albert Stebbins Peter Timbie YanPing Cong JingChao Geng Jie Hao QiZhi Huang JianBin Li Rui Li DongHao Liu YingFeng Liu Tao Liu John PMarriner ChenHui Niu Ue-Li Pen Jeffery BPeterson HuLi Shi Lin Shu YaFang Song HaiJun Tian GuiSong Wang QunXiong Wang RongLi Wang WeiXia Wang Xin Wang KaiFeng Yu Jiao Zhang BoQin Zhu JiaLu Zhu XueLei Chen National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space science University of Chinese Academy of SciencesBeijing 100049China Center for Astrophysics and department of Astronomy Tsinghua UniversityBeijing 100084China School of Mechanical engineering Hangzhou Dianzi UniversityHangzhou 310018China IJC Lab CNRS/IN2P3&UniversitéParis-SaclayOrsay 91405France department of Physics and Astronomy University of the Western CapeBelville 7535Republic of South Africa Fermi National Accelerator laboratory Batavia IL 60510-5011USA department of Physics University of Wisconsin MadisonMadison WI 53703USA The 54th Research Institute China Electronics Technology Group CorporationShijiazhuang 050051China Institute of Automation Chinese Academy of SciencesBeijing 100190China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830001China Canadian Institute for Theoretical Astrophysics University of TorontoToronto M5S 3H8Canada department of Physics Carnegie Mellon UniversityPittsburgh PA 15213USA Center for Astronomy and Space sciences China Three Gorges UniversityYichang 443002China School of Physics and Astronomy Sun Yat-sen UniversityGuangzhou 510297China College of Physics and Electronic engineering Shanxi UniversityTaiyuan 030006China Center of High Energy Physics Peking UniversityBeijing 100871China

The Tianlai Cylinder Pathfinder is a radio interferometer array designed to test techniques for 2. cm intensity mapping in the post-reionization Universe,with the ultimate aim of mapping the large scale structure and measuring cosmological parameters such as the dark energy equation of *** of its three parallel cylinder reflectors is oriented in the north-south direction,and the array has a large field of *** the Earth rotates,the northern sky is observed by drift *** array is located in Hongliuxia,a radio-quiet site in Xinjiang,and saw its first light in September *** this first data analysis paper for the Tianlai cylinder array,we discuss the sub-system qualification tests,and present basic system performance obtained from preliminary analysis of the commissioning observations during *** show typical interferometric visibility data,from which we derive the actual beam profile in the east-west direction and the frequency band-pass *** describe also the calibration process to determine the complex gains for the array elements,either using bright astronomical point sources,or an artificial on site calibrator source,and discuss the instrument response stability,crucial for transit *** on this analysis,we find a system temperature of about 90 K,and we also estimate the sensitivity of the array.

关键词： interferometer radio astronomy neutral hydrogen cosmology dark energy

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mechanics and multidisciplinary study for creating graphene-based sliding nano/microscale devices

Mechanics and multidisciplinary study for creating graphene-...

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IUTAM Symposium on Surface Effects in the mechanics of Nanomaterials and Heterostructures

作者： F.Grey department of Physics ＆ CNMM Tsinghua University

＜正＞Elastic resonators have been the core elements for many types of nano-micro scale instruments and devices（***,mass and acceleration sensors,AFM,SNOM）.A bottleneck challenge is their dramatically reduced quality factors as shrinking size due to the inevitable thermal dissipation in the elastic deforming *** der Waals（vdW） oscillators invented recently[1]have the novel sliding motion mode in the micron-range that are retracted by the vdW interaction effectively in only1-nm *** has revealed that the latter has two orders of magnitude higher in both motion speed and quality factor,that are the two major multipliers contributing to the precision such as *** features may promise a new class of various nano-micro devices.

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