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Effect of Shape and Placement of Twisted Pin Fins in a Rectangular Channel on Thermo-Hydraulic Performance

Journal of Thermal Science 2024年第5期33卷 1773-1793页

作者： LI Yong ZHANG Jin ZHANG Yingchun ZHANG Jiajie MA Suxia SUNDEN bengt XIE Gongnan College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Cleaner Intelligent Control on Coal&Electricity Ministry of EducationTaiyuan 030024China Shanxi Provincial Key Laboratory of High Efficiency Heat Storage and Low Carbon Heat Supply Taiyuan 030008China School of Energy and Power Engineering North University of ChinaTaiyuan 030051China Department of Energy Sciences Lund UniversityP.O.Box 118Lund SE 22100Sweden School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China

To enhance the thermo-hydraulic performance of cooling channels,this investigation examines the influence of distinct cross-sectional shapes(i.e.,triangular,rectangular,and hexagonal)of twisted pin fins and their arrangements in straight and cross *** ambient air cooling test platform was established to numerically and experimentally investigate the flow and heat transfer characteristics of 360°twisted pin fins at Re=*** findings reveal that straight rows exhibit higher Nu values than cross rows for triangular and rectangular twisted pin fins,and Nu increases with *** contrast,for hexagonal twisted pin fins,only straight rows at Re=19000 exhibit superior overall thermal performance compared to cross ***,the heat transfer performance of the cooling channel with hexagonal twisted fins surpasses both triangular and rectangular configurations,especially at high Reynolds numbers(Re=22800).Although the heat transfer coefficient of the cooling channel with hexagonal twisted fins is significantly enhanced by 132.71%compared to the flat channel,it also exhibits the highest thermal resistance and relative friction among the three types of twisted fins,the maximum of which are 2.14 and ***,the hydrothermal performance factor(HTPF)of the cooling channels with different types of twisted pin fins depends on the Reynolds number and arrangement *** Re=15200,the highest HTPF achieved for the cross-row hexagonal twisted pin fins is 0.99.

关键词： twisted pin fin cross arrangement heat transfer pressure drop HTPF

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反馈空间——重访1969年天文气球

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城市环境设计 2010年第12期 122-125页

作者：沃尔夫·狄·普瑞克斯 W.Dreibholz Partner ZT GmbH bengt stiller 蓝天组

重访1969回收装置在该装置中,有两片薄膜可以测量并转化游客的心跳。本装置的构思来源于1971年的"反馈电路计划"(也就是今天的网络),它是一种非言语交际网络,physicalness可以被看作城市发展的一个模块。重访1969年天文气球——反馈空... 详细信息

重访1969回收装置在该装置中,有两片薄膜可以测量并转化游客的心跳。本装置的构思来源于1971年的"反馈电路计划"(也就是今天的网络),它是一种非言语交际网络,physicalness可以被看作城市发展的一个模块。重访1969年天文气球——反馈空间是一个心形的装置,类似双球或抽象的昆虫眼睛。柔软的充气结构诱使人们去触摸它。进入装置后,游客可

关键词：气球装置

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Recent Development of Heat Transfer and Fluid Flow of Supercritical CO2 in Tubes:Mechanisms and Applications

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Journal of Thermal Science 2024年第6期33卷 2274-2298页

作者： ZHANG Xirui SHAO Qihan LIU Jian XI Wenxiong LIU Chaoyang SUNDEN bengt Research Institute of Aerospace Technology Central South University College of Aerospace Science and Engineering National University of Defense Technology Department of Energy Sciences Lund University

With the advantages of low cost,excellent ability of heat and mass transfer and easy accessibility to the supercritical point,supercritical CO2has been applied in many engineering devices *** of the sharply-varying thermophysical properties near the supercritical point,heat transfer and flow behavior of supercritical CO2in tubes become complex and have received a lot of research *** main purpose of this paper is to summarize the findings of the published works related to flow phenomena and heat transfer characteristics of supercritical ***,influence parameters related to boundary conditions of supercritical CO2flowing in a smooth tube are ***,commonly-used turbulence and mathematic models dealing with internal flows of supercritical CO2are ***,research works on geometric effects of design parameters,shapes and configurations are *** practical applications of supercritical CO2in recent years are ***,developments and future challenges of supercritical CO2in tubes are analyzed and *** paper provides basic knowledge of heat transfer and fluid flow mechanisms and related practical applications of supercritical CO2in tubes.

关键词： developments and challenges flow behavior heat transfer practical applications supercritical CO2

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Emerging Genomic and Proteomic Evidence on Relationships Among the Animal, Plant and Fungal Kingdoms

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Genomics, Proteomics & Bioinformatics 2004年第2期2卷 70-76页

作者： John W. stiller Department of Biology East Carolina University Greenville NC 27858 USA.

Sequence-based molecular phytogenies have provided new models of earlyeu-karyotic evolution. This includes the widely accepted hypothesis that animals are related mostclosely to fungi, and that the two should be grouped together as the Opisthokonta. Although mostpublished phylogenies have supported an opisthokont relationship, a number of genes contain atree-building signal that clusters animal and green plant sequences, to the exclusion of fungi. Thealternative tree-building signal is especially intriguing in light of emerging data from genomic andproteomic studies that indicate striking and potentially synapomor-phic similarities between plantsand animals. This paper reviews these new lines of evidence, which have yet to be incorporated intomodels of broad scale eukaryotic evolution.

关键词： genomics proteomics evolution animals plants fungi

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Investigation of Interacting Mechanism between Film Cooling and Internal Cooling Structures of Turbine Blade

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Journal of Thermal Science 2023年第1期32卷 330-350页

作者： ZHANG Guohua XIE Gongnan bengt Sundén School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Department of Energy Sciences Lund UniversityLund SE-22100Sweden Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

This paper presents three-dimensional numerical simulations with the established realizable k-εmodel to clarify the underlying and interacting mechanisms between the film cooling and the internal *** the one hand,the effects of three different internal cooling channels,i.e.,smooth channel,continuous ribbed channel,and truncated ribbed channel,on the film cooling effectiveness and the discharge coefficients are *** the other hand,the influences of three different film cooling holes,i.e.,cylindrical hole,two elliptical holes and two circular-to-elliptical holes,on the heat transfer performances and pressure loss of the internal cooling channel are ***,the suction effects of the film cooling holes are analyzed through setting up baselines with only internal cooling *** show that the placement of ribs in the internal channel has different influences on the film cooling effectiveness with respect to different hole shapes depending on the blowing *** discharge coefficient of the film hole can be improved by introducing ribs to the internal *** of film hole is helpful for enhancing the heat transfer performance and reducing the pressure loss of the internal ***,ribs instead of the suction effect of film hole play a major role to enhance the heat transfer performance in the internal cooling channel.

关键词： interacting mechanism film cooling effectiveness discharge coefficient heat transfer performance pressure drop

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MAGNETIC FIELD EFFECT ON PHOTOPOLYMERIZATION OF STYRENE MICROEMULSION

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Chinese Journal of Polymer Science 1993年第1期11卷 1-7页

作者：陈用烈 Anders Hult bengt Ranby Institute of Polymer Science Zhongshan University Guangzhou Department of Polymer Technology The Royal Institute of Technology Stockholm Sweden

External magnetic field increases the photo-induced polymerization rate of styrene *** type of photoinitiator plays an important role. The photoinitiators, used are dimethoxyphenyl acetophenone(DMPA), 1-hydroxycyclohexyl phenylketone (Irgacure 184) and dimethylhydroxyacetophenone (Darocur 1173). No magnetic effect was observed by using dibenzylketone (DBK) as photoinitiator. The molecular weight of the polymer is slightly affected by magnetic field. The influence of temperature has also been investigated.

关键词： DMPA MAGNETIC FIELD EFFECT ON PHOTOPOLYMERIZATION OF STYRENE MICROEMULSION

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Comparisons of Heat Transfer Enhancement of an Internal Blade Tip with Metal or Insulating Pins

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Advances in Applied Mathematics and Mechanics 2011年第3期3卷 297-309页

作者： Gongnan Xie bengt Sunden The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina Division of Heat Transfer Lund UniversitySE-22100LundSweden

Cooling methods are needed for turbine blade tips to ensure a long durability and safe operation.A common way to cool a tip is to use serpentine passages with 180-deg turn under the blade tip-cap taking advantage of the threedimensional turning effect and impingement like *** internal convective cooling is therefore required to increase the blade tip *** the present study,augmented heat transfer of an internal blade tip with pin-fin arrays has been investigated numerically using a conjugate heat transfer *** computational domain includes the fluid region and the solid pins as well as the tip *** convective heat transfer between the fluid and pins,and heat conduction within pins and tip are simultaneously *** main objective of the present study is to observe the effect of the pin material on heat transfer enhancement of the pin-finned *** is found that due to the combination of turning,impingement and pin-fin crossflow,the heat transfer coefficient of a pin-finned tip is a factor of 2.9 higher than that of a smooth tip at the cost of an increased pressure drop by less than 10%.The usage of metal pins can reduce the tip temperature effectively and thereby remove the heat load from the ***,it is found that the tip heat transfer is enhanced even by using insulating pins having low thermal conductivity at low Reynolds *** comparisons of overall performances are also included.

关键词： Heat transfer enhancement tip-wall pins thermal conductivity weight

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Gut microbiota and surgical disease

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Hepatobiliary Surgery and Nutrition 2018年第1期7卷 32-33页

作者： bengt Jeppsson Department of Surgery Lund UniversityLundSweden

Why should surgeons study gut microbiota and microbiome(totality of body's microorganisms and genomes)?There are at least three reasons.

关键词： surgical reasons surgeon

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Effects of Ribbed-Cavity Tip on the Blade Tip Aerothermal Performance in a High Pressure Turbine Stage

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Journal of Thermal Science 2023年第2期32卷 800-811页

作者： DU Kun LI Huarong SUNDEN bengt LIU Cunliang School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Yangtze River Delta Research Institute of NPU Northwestern Polytechnical UniversityTaicang 215400China Shaanxi Key Laboratory of Thermal Sciences in Aero-Engine System Northwestern Polytechnical UniversityXi'an 710129China NPU-KAI International Joint Laboratory of Advanced Aero-Engine Thermal Structure Northwestern Polytechnical UniversityXi'an 710129China Division of Heat Transfer Department of Energy SciencesLund UniversityLund SE-22100Sweden

For unshrouded blade tip,the high-temperature gas flows through the tip clearance by force of the lateral pressure ***,the blade tip endures increasing thermal ***,the conventional blade tip treatment cannot continuously provide protection for the deteriorating service *** the present study,aerothermal characteristics of the squealer blade tip with staggered ribs,partial squealer rim and different partial squealer rim thickness were investigated to explore the influences of ribbed-cavity tip on the tip heat transfer,leakage flow and turbine stage *** numerical results indicate that the ribbed-cavity tips are beneficial for the reduction of the blade tip thermal load and leakage *** the present six blade tip designs,the minimal area-averaged heat transfer coefficient is obtained by the case with the staggered ribs and a deeper squealer rim,which is reduced by 31.41%relative to the squealer ***,the blade tip modification closer to leading edge or tip mid-chord region performs better than trailing edge in reducing the tip leakage flow.

关键词： gas turbine tip leakage flow numerical simulation blade tip configuration

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Are yarn quality prediction tools useful in the breeding of high yielding and better fibre quality cotton(Gossypium hirsutum L.)?

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Journal of Cotton Research 2023年第4期6卷 227-239页

作者： LIU Shiming GORDON Stuart stiller Warwick CSIRO Agriculture and Food NarrabriNSW 2390Australia CSIRO Agriculture and Food WerribeeVIC 3030Australia

Results The population had large variations for lint yield,fibre properties,predicted yarn properties,and composite fibre quality *** yield with all fibre quality traits was not *** the selection was conducted first to keep those with improved fibre quality,and followed for high yields,a large proportion in the resultant populations was the same between selections based on Cottonspec predicted yarn quality and HVI-measured fibre *** both exceeded the selection based on FQI and Background The approach of directly testing yarn quality to define fibre quality breeding objectives and progress the selection is attractive but difficult when considering the need for time and *** question remains whether yarn prediction tools from textile research can serve as an *** this study,using a dataset from three seasons of field testing recombinant inbred line population,Cottonspec,a software developed by the Commonwealth Scientific and Industrial Research Organisation(CSIRO)for predicting ring spun yarn quality from fibre properties measured by High Volume Instrument(HVI),was used to select improved fibre quality and lint yield in the *** population was derived from an advanced generation inter-crossing of four CSIRO conventional commercial *** Cottonspec program was able to provide an integrated index of the fibre qualities affecting yarn *** was compared with selection based on HVI-measured fibre properties,and two composite fibre quality variables,namely,fibre quality index(FQI),and premium and discount(PD)*** latter represents the net points of fibre length,strength,and micronaire based on the Premiums and Discounts Schedule used in the market while modified by the inclusion of *** *** The population contained elite segregants with improved yield and fibre properties,and Cottonspec predicted yarn quality is useful to effectively capture these *** is a nee

关键词： Yield Fibre properties Fibre quality index Predictive yarn quality Cotton marketing Cotton breeding

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