Advances in cryogenic engineering最新文献

The Aspect-Ratio Effect of He II Channels on the Heat Transport Characteristics He II通道宽高比对传热特性的影响

Advances in cryogenic engineering Pub Date : 2015-04-14 DOI: 10.1007/978-1-4613-0373-2_36

H. Kobayashi, Y. Akedo, K. Kawakami

引用次数: 1

Effect of Flow-Pressure Phase on Performance of Regenerators in the Range of 4 K to 20 K 4 ~ 20 K范围内流压相对蓄热器性能的影响

Advances in cryogenic engineering Pub Date : 2014-01-29 DOI: 10.1063/1.4860751

M. Lewis, R. P. Taylor, P. Bradley, R. Radebaugh

{"title":"Effect of Flow-Pressure Phase on Performance of Regenerators in the Range of 4 K to 20 K","authors":"M. Lewis, R. P. Taylor, P. Bradley, R. Radebaugh","doi":"10.1063/1.4860751","DOIUrl":"https://doi.org/10.1063/1.4860751","url":null,"abstract":"Modeling with REGEN3.3 has shown that the phase between flow and pressure at the cold end of 4 K regenerators has a large effect on their second-law efficiency. The use of inertance tubes in small 4 K pulse tube cryocoolers has limited phase-shifting ability, and their phase shift cannot be varied unless their dimensions are varied. We report here on the use of a miniature linear compressor, operating at the pulse tube warm end of about 30 K, as a controllable expander that can be used to vary the phase over 360°. We also use the back EMF of the linear motor to measure the acoustic power, flow rate amplitude, and phase between flow and pressure at the piston face. We discuss the measurements of the linear motor parameters that are required to determine the piston velocity from the back EMF as well as the measurement procedures to determine the back EMF when the expander is operating at a temperature around 30 K. Our experimental results on the performance of a regenerator/pulse tube stage operating below 30 K show an optimum performance when the flow at the phase shifter lags the pressure by about 65° to 80°, which is close to the model results of about 60°. Temperatures below 10 K were achieved at the cold end in these measurements. The efficiency of the compressor operating as an expander is also discussed.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.4860751","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58793604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Forced convection heat transfer of subcooled liquid hydrogen in horizontal tubes 过冷液氢在水平管内的强制对流换热

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4706987

H. Tatsumoto, Y. Shirai, M. Shiotsu, K. Hata, Y. Naruo, H. Kobayashi, Y. Inatani, Kensuke Kinoshita

引用次数: 14

Steady-State heat transfer through micro-channels in pressurized He II 加压He中微通道稳态传热研究[j]

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4706925

P. Granieri, B. Baudouy, A. Four, Fernando Lentijo, A. Mapelli, P. Petagna, D. Tommasini

引用次数: 8

Cryocoolers for aircraft superconducting generators and motors 飞机超导发电机和电动机用制冷机

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4706918

R. Radebaugh

引用次数: 22

Technical aspects of cold high pressure densification (CHPD) on long lengths of In Situ MgB2 wires with enhanced Jc values 提高Jc值的长长度原位MgB2钢丝冷高压致密化(CHPD)技术方面

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4712116

R. Flukiger, M. S. Hossain, M. Kulich, C. Senatore

{"title":"Technical aspects of cold high pressure densification (CHPD) on long lengths of In Situ MgB2 wires with enhanced Jc values","authors":"R. Flukiger, M. S. Hossain, M. Kulich, C. Senatore","doi":"10.1063/1.4712116","DOIUrl":"https://doi.org/10.1063/1.4712116","url":null,"abstract":"The technical aspects correlated with the observed enhancement of mass density and critical current density in the filaments of in situ MgB2 wires by means of the recently developed Cold High Pressure Densification (CHPD) are reviewed. The present analysis first summarizes the results obtained by means of a short sample prototype device with anvil lengths of 39 mm. Pressures well above 1 GPa were applied to short wires, causing Jc enhancements between a factor 1.5 and 2.3 at 4.2 K and 8 T. At 20 K, the enhancement is much stronger and reaches a factor 3 for binary and 5 for alloyed MgB2 wires. Based on these results, an automatic machine has been developed allowing a sequential press/release/advance operation. With this machine, which has been very recently installed at GAP in Geneva, in situ MgB2 wires of lengths up to 10 meters have so far been successfully densified, confirming the Jc enhancements obtained with the short sample device. Using an improved anvil geometry, the wall friction was reduced with respect to the short sample prototype device, thus yielding the same Jc enhancements, but at considerably lower applied pressures: now, Jc max was obtained at 0.85 GPa, in contrast to values between 1.3 and 1.5 GPa for the short sample device. After densifying at this pressure, the value of Jc = 1 × 104 A/cm2 at 4.2 K was obtained at 13.2 T over 1 m length, thus corresponding to an enhancement by a factor 2.2 with respect to the non pressed wire. The present results are promising in view of the application of CHPD to industrial wire lengths.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.4712116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58657839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Development of a 15 K hydrogen-based sorption cooler 15k氢基吸附冷却器的研制

Advances in cryogenic engineering Pub Date : 2010-04-23 DOI: 10.1063/1.3422380

J. Burger, H. J. Holland, R. J. Meijer, M. Linder, H. T. Brake

引用次数: 6

INTERFACING ISSUES IN MICROCOOLING OF OPTICAL DETECTORS IN SPACE APPLICATIONS 空间应用中光学探测器微冷却的接口问题

Advances in cryogenic engineering Pub Date : 2010-04-23 DOI: 10.1063/1.3422411

J. H. Derking, H. T. Brake, M. Linder, H. Rogalla

引用次数: 1

VERY LOW FREQUENCY BREAKDOWN PROPERTIES OF ELECTRICAL INSULATION MATERIALS AT CRYOGENIC TEMPERATURES 低温下电绝缘材料的甚低频击穿特性

Advances in cryogenic engineering Pub Date : 2010-04-07 DOI: 10.1063/1.3402335

I. Sauers, E. Tuncer, G. Polizos, D. James, A. Ellis, M. Pace

引用次数: 1

VOLTAGE DISTRIBUTION AND MECHANICAL STRENGTH IN SPLICE JOINTS MADE FROM AS‐MANUFACTURED YBCO COATED CONDUCTORS 由自制的ybco涂层导体制成的拼接接头的电压分布和机械强度

Advances in cryogenic engineering Pub Date : 2010-04-07 DOI: 10.1063/1.3402325

R. Duckworth, Y. Zhang, M. Gouge, C. Rey, D. V. D. Laan, C. Clickner

引用次数: 19