Cryogenics最新文献_第8页

Damping characteristics of High-Temperature superconducting pinning maglev levitation system 高温超导销钉式磁悬浮系统的阻尼特性

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103892

Xucheng Zhou , Yi Luo , Yuchen He , Can Peng , Peiyang Zeng , Yan Li , Zigang Deng

{"title":"Damping characteristics of High-Temperature superconducting pinning maglev levitation system","authors":"Xucheng Zhou , Yi Luo , Yuchen He , Can Peng , Peiyang Zeng , Yan Li , Zigang Deng","doi":"10.1016/j.cryogenics.2024.103892","DOIUrl":"https://doi.org/10.1016/j.cryogenics.2024.103892","url":null,"abstract":"<div><p>High-temperature superconducting (HTS) pinning maglev has achieved rapid development in recent decades. The levitation system of the HTS pinning maglev is mainly composed of Dewar with built-in HTS bulks and permanent magnet guideway (PMG). For a maglev transportation system, damping is important for vibration attenuation, and the inherent damping characteristics of the HTS pinning maglev system have not been evaluated clearly. In this paper, the damping characteristics of the HTS pinning maglev system are analyzed through experiments and simulations. Experiments are conducted to measure the dynamic responses of the system under free and forced vibrations. The logarithmic envelope method is used to evaluate the system damping under free vibration. The cross-correlation function is utilized to obtain the phase difference between the system vibration signal and excitation signal, and then calculate the system damping under forced vibration conditions. In addition, a two-dimensional finite element model including HTS bulks, PMG, and Dewar conductive shells is established to evaluate the damping force generated by each component during system vibrations. The additional eddy current damping of the conductive Dewar shell is considered and analyzed. Finally, from the perspective of system damping and thermal stability of HTS bulks, suggestions for selecting Dewar shell materials are proposed.</p></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"141 ","pages":"Article 103892"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141543557","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}

引用次数: 0

Design of direct-drive permanent magnet synchronous motor for cryogenic valve 低温阀门直驱永磁同步电机的设计

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103894

Zhe Zhao , Yongguang Liu , Xiaohui Gao , Saisai Tong

引用次数: 0

Experimental study on the cryogenic distillation system for high-purity liquid nitrogen under offshore conditions 海上条件下高纯度液氮低温蒸馏系统的实验研究

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103885

Shaopeng Wang , Yang Meng , Liang Chen , Yicheng Zhang , Junxin Wang , Shuangtao Chen , Yu Hou

{"title":"Experimental study on the cryogenic distillation system for high-purity liquid nitrogen under offshore conditions","authors":"Shaopeng Wang , Yang Meng , Liang Chen , Yicheng Zhang , Junxin Wang , Shuangtao Chen , Yu Hou","doi":"10.1016/j.cryogenics.2024.103885","DOIUrl":"https://doi.org/10.1016/j.cryogenics.2024.103885","url":null,"abstract":"<div><p>Cryogenic distillation is widely acknowledged as the primary industrial method for producing liquid nitrogen of high purity. However, the distillation process is highly sensitive to tilting and swinging, which limits the application of cryogenic air separation in offshore infrastructures. This paper proposes a small-scale air separation process that incorporates a dual-column distillation to enhance distillation performance under offshore conditions. Experiments were conducted under standard (no-tilting and stationary), tilting, and swinging conditions. The results indicate that the proposed distillation plant can maintain nitrogen purity to a certain extent under offshore conditions. The product impurity (oxygen content) increased significantly as the tilting angles increased beyond 4° for horizontal titling and 3° for longitudinal titling, respectively. The distillation performance was less affected by the swing than the tilting. High-purity nitrogen could be produced when swing amplitude was within ±10° and swing period was between 6 s and 11 s. The results can provide engineering guidance for the design and installation of the columns of air-separation plants.</p></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"141 ","pages":"Article 103885"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141480444","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}

引用次数: 0

An experimental and numerical framework to assess the temperature distribution in complex He II-cooled magnet geometries 评估复杂 He II 冷却磁体几何结构中温度分布的实验和数值框架

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103888

Kirtana Puthran , Patricia Borges de Sousa , Lise Murberg , Torsten Koettig , Rob van Weelderen

{"title":"An experimental and numerical framework to assess the temperature distribution in complex He II-cooled magnet geometries","authors":"Kirtana Puthran , Patricia Borges de Sousa , Lise Murberg , Torsten Koettig , Rob van Weelderen","doi":"10.1016/j.cryogenics.2024.103888","DOIUrl":"10.1016/j.cryogenics.2024.103888","url":null,"abstract":"<div><p>In the context of the High Luminosity upgrade of the Large Hadron Collider at CERN, a framework implementing experimental techniques and numerical analysis has been developed to systematically assess the temperature distribution in complex He II-cooled composite magnet geometries. The experiments are designed to measure the heat transfer coefficients in the magnet coil layers using coil samples in a stagnant superfluid helium bath. A numerical tool-kit has been developed to facilitate intensive parametric studies, in addition to estimation of helium content via a phenomenological model. The workflow of the tool-kit is built to handle complex geometries composed of different materials each with their temperature-dependent properties, at low computational cost. This framework has been validated with experimental data obtained from laboratory-scale experiments on impregnated coil samples, reported and discussed here. Three use cases for the developed numerical tool, with increasing levels of complexity, are presented and its results discussed.</p></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"141 ","pages":"Article 103888"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0011227524001085/pdfft?md5=3ff85cc57594b3cc0de1e3f1ebb7cf94&pid=1-s2.0-S0011227524001085-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141636976","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}

引用次数: 0

Experimental study on nitrogen pulsating heat pipes with different heat transmission distances and configurations 不同传热距离和结构的氮气脉动热管实验研究

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103898

Yaran Shi , Jixiang Yan , Yuan Zhou , Dong Xu , Laifeng Li

{"title":"Experimental study on nitrogen pulsating heat pipes with different heat transmission distances and configurations","authors":"Yaran Shi , Jixiang Yan , Yuan Zhou , Dong Xu , Laifeng Li","doi":"10.1016/j.cryogenics.2024.103898","DOIUrl":"10.1016/j.cryogenics.2024.103898","url":null,"abstract":"<div><p>The heat transfer performance of nitrogen PHPs with different heat transmission distances (100 mm and 500 mm) and tube configurations (single-loop and complex-loop) were experimentally investigated. Experiments were conducted in the vertical bottom heat mode with different filling ratios (15 %–70 %). The results showed that the maximum effective thermal conductivity increased proportionally with the heat transmission distance whereas the thermal resistance remained constant (0.2 K/W at a filling ratio of 31.8 %). This verified the outstanding long-distance heat transfer advantage of the nitrogen PHP. Experiments at different filling ratios showed that the maximum thermal conductivity decreased as the filling ratios increased. A filling ratio of 31.8 % was recommended. Under this operating condition, the PHP can load the maximum heat input while exhibiting relatively high effective thermal conductivity. Compared to the single-loop configuration, the complex-loop exhibited higher effective thermal conductivity, and this enhancement in thermal performance was more pronounced for the longer PHP.</p></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"141 ","pages":"Article 103898"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141701190","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}

引用次数: 0

Essential properties of sub-cooled water ice and background field properties of MgB2 coil measured in it 过冷水冰的基本特性和在其中测量的 MgB2 线圈的背景场特性

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103897

P. Kováč, M. Búran, L. Kopera

引用次数: 0

Demonstration test of gas contaminants adsorbent for space Stirling cooler 用于空间斯特林冷却器的气体污染物吸附剂示范试验

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103884

Yoichi Sato , Kosuke Tanaka , Keisuke Shinozaki

引用次数: 0

Synthesis and cryogenic mechanical properties of degradable epoxy resins containing hexahydro-s-triazine structure 含六氢-s-三嗪结构的可降解环氧树脂的合成与低温力学性能

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103883

Tian Zhao , Yalin Zhao , Zhicong Miao , Tao Wang , Rongjin Huang , Laifeng Li

{"title":"Synthesis and cryogenic mechanical properties of degradable epoxy resins containing hexahydro-s-triazine structure","authors":"Tian Zhao , Yalin Zhao , Zhicong Miao , Tao Wang , Rongjin Huang , Laifeng Li","doi":"10.1016/j.cryogenics.2024.103883","DOIUrl":"10.1016/j.cryogenics.2024.103883","url":null,"abstract":"<div><p>Epoxy resins are widely used in cryogenic applications due to their distinguished mechanical and electrical insulation properties. To avoid generating enormous amounts of waste that affect the environment and cause economic losses, covalent adaptable networks can be introduced into the epoxy structure to make the thermosetting network reversible. In this study, ester bond and hexahydro-s-triazine structure were adopted in epoxy structures. Two new degradable epoxy resins (HPBE and HPHE) with variances in the content of benzene rings were synthesized which were confirmed by FTIR and NMR. After curing, the thermal, mechanical, thermal conducting properties of the resulting materials were examined. The products exhibited tensile strength and flexural strength all above 120 MPa at 77 K, with glass transition temperature of 89.1 °C and 86.9 °C, respectively. Meanwhile, HPBE and HPHE demonstrated favorable thermal stability, with thermal conductivity comparable to that of the commonly used epoxy resin DGEBA. These resins could be degraded under mild conditions and demonstrated high hydrolysis efficiency (approximately 90 %). This investigation presented a viable method for the application of degradable thermosetting materials in cryogenic environments and the possibility for repairing of high-value equipment.<span><sup>1</sup></span></p></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"141 ","pages":"Article 103883"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141393815","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}

引用次数: 0

The pressure-volume relationship in an ideal Stirling refrigerator 理想斯特林冰箱中的压力-容积关系

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103882

Danielle Yang, Michael Gschwendtner, Zindh Waleed, Michael Protheroe

{"title":"The pressure-volume relationship in an ideal Stirling refrigerator","authors":"Danielle Yang, Michael Gschwendtner, Zindh Waleed, Michael Protheroe","doi":"10.1016/j.cryogenics.2024.103882","DOIUrl":"https://doi.org/10.1016/j.cryogenics.2024.103882","url":null,"abstract":"<div><p>Hysteresis losses in the heat transfer between compressing or expanding gas and the adjacent wall is said to play an important role in Stirling machines, where it increases the amount of required p-V work. Previous studies have linked hysteresis loss with the pressure phase shift. In the context of this research, the effect of the pressure phase shift on the net p-V work in a single space is examined.</p><p>A Sage model of a single space piston-cylinder device is used to investigate the underlying mechanisms of the pressure phase shift. The Sage model is validated using an experimental piston seal rig. In addition, the time dependence of heat transfer is discussed along with how it affects the pressure phase shift, using an iterative model. The Schmidt equations were manipulated to determine the phase shift between pressure and volumetric oscillation in an ideal Stirling refrigerator.</p><p>The results of this investigation are surprising. It was found that even in the case of an idealized Stirling refrigerator, the phase shift between pressure and volume is non-zero in order to produce a refrigeration effect.</p></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"141 ","pages":"Article 103882"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0011227524001024/pdfft?md5=6da267f8da7e3cc4e6f979ef22593142&pid=1-s2.0-S0011227524001024-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141480445","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}

引用次数: 0

An efficient numerical method for modeling silver powder heat exchanger in dilution refrigerator 稀释冰箱中银粉热交换器建模的高效数值方法

IF 1.8 3区工程技术

Cryogenics Pub Date : 2024-07-01 DOI: 10.1016/j.cryogenics.2024.103891

Xiang Guan , Jie Fan , Yong Bo Bian , Zhi Gang Cheng , Zhong Qing Ji

引用次数: 0