检索结果-南通市图书馆

Effects of Pulsation on Separated Flow and Heat Transfer in Enlarged Channel

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2011年第1期20卷 70-75页

作者： Hiroyuki YOSHIKAWA Tomonori KAI Mizue MUNEKATA hideki OHBA Dept.of Mechanical System Engineering Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Kikuyo KikuchiKumamoto 869-1101Japan

Numerical results of three-dimensional separated flow and heat transfer in an enlarged rectangular channel are presented in this *** expansion ratio and aspect ratio of the channel are 2.0 and 16.0,*** number of the flow is 200 and it is over the critical Reynolds *** the critical Reynolds number,the flow in the symmetric channel becomes asymmetric and deflects to one side of the *** of the pulsating fluctuation at the inlet upon the flow in the channel are *** is clarified that the inlet flow with a pulsating fluctuation of Strouhal number 0.05 and 0.10 strongly affects on the flow in the channel,and heat transfer on the walls is enhanced,especially on the wall surface covered with long separation *** the other hand,the pulsation of St=0.0125 oscillates the shear layer more weakly than that of St=0.05,0.10 and the enhancement of heat transfer is smaller,though some vortices are shed from the vicinity of the side wall near the reattachment *** oscillation of the main flow calms down gradually as the Strouhal number of the pulsation increases over *** influence of pulsation of St=0.20 on the flow is restricted in the near downstream of the step,and heat transfer on the walls is almost similar to that of the steady flow in the channel.

关键词： Pulsating Fluctuation Symmetric Enlarged Channel Separated Flow Heat Transfer

Contributions of the Secondary Jet to the Tangential Velocity Distribution and to the Collection Efficiency of the Fixed Guide Vane Type Axial Flow Cyclone Dust Collector

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2015年第6期24卷 503-509页

作者： Akira Ogawa hideki Anzou So Yamamoto Mituru Shimagaki Tokyo Japan

In order to control the maximum tangential velocity V?m(m/s)of the turbulent rotational air flow and the collection efficiencyηc(%)using the fly ash of the mean diameter X R50=5.57?m,two secondary jet nozzles were installed to the body of the axial flow cyclone dust collector with the body diameter D1=*** in order to estimate V?m(m/s),the conservation theory of the angular momentum flux with Ogawa combined vortex model was *** comparisons of the estimated results of V?m(m/s)with the measured results by the cylindrical Pitot-tube were shown in good *** also the estimated collection efficienciesηcth(%)basing upon the cut-size Xc(?m)which was calculated by using the estimated V?m(m/s)and also the particle size distribution R(Xp)were shown a little higher values than the experimental results due to the re-entrainment of the collected *** best method for adjustment ofηc(%)related to the contribution of the secondary jet flow is principally to apply the centrifugal effect?c(1).Above stated results are described in detail.

关键词： Axial Flow Cyclone Dust Collector Maximum Tangential Velocity Cut-Size Particle Size Distribution Collection Efficiency Reynolds number Centrifugal Effect

Distribution characteristics of inclusions along with the surface sliver defect on the exposed panel of automobile:A quantitative electrolysis method

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1489-1498页

作者： Xiao-qian Pan Jian Yang Joohyun Park hideki Ono State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Department of Materials Engineering Hanyang UniversityAnsan 426-791South Korea Faculty of Sustainable Design University of ToyamaToyama-ken 930-8555Japan

The specific distribution characteristics of inclusions along with the sliver defect were analyzed in detail to explain the formation mechanism of the sliver defect on the automobile exposed panel surface.A quantitative electrolysis method was used to compare and evaluate the three-dimensional morphology,size,composition,quantity,and distribution of inclusions in the defect and non-defect zone of automobile exposed *** Al2O3 inclusions were observed to be aggregated or chain-like shape along with the sliver defect of about 3–10μ*** aggregation sections of the Al2O3 inclusions are distributed discretely along the rolling direction,with a spacing of 3–7 mm,a length of 6–7 mm,and a width of about 3 *** inclusion area part is 0.04%–0.16%with an average value of 0.08%,the inclusion number density is 40 mm−2 and the inclusion average spacing is 25.13μ*** inclusion spacing is approximately 40–160μm,with an average value of 68.76μm in chain-like inclusion *** average area fraction and number density of inclusions in the non-defect region were reduced to about 0.002%and 1–2 mm^−2,respectively,with the inclusion spacing of 400μm and the size of Al2O3 being 1–3μm.

关键词： automobile exposed panel sliver defect quantitative electrolysis three-dimensional inclusions aggregated inclusions chain-like inclusions

Numerical Simulations of Rarefied Gases in Curved Channels: Thermal Creep, Circulating Flow, and Pumping Effect

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2009年第10期6卷 919-954页

作者： Kazuo aoki Pierre Degond Luc Mieussens Department of Mechanical Engineering and Science Graduate School of EngineeringKyoto UniversityKyoto 606-8501Japan Universite de Toulouse UPSINSAUT1UTMInstitut de Mathematiques de ToulouseF-31062 ToulouseFrance CNRS Institut de Mathematiques de Toulouse UMR 5219F-31062 ToulouseFrance Universite de Bordeaux Institut de Mathematiques de Bordeaux351cours de la Liberation33405 Talence cedexFrance

We present numerical simulations of a new system of micro-pump based on the thermal creep effect described by the kinetic theory of *** device is made of a simple smooth and curved channel with a periodic temperature *** the Boltzmann-BGK model as the governing equation for the gas flow,we develop a numerical method based on a deterministic finite volume scheme,implicit in time,with an implicit treatment of the boundary *** method is comparatively less sensitive to the slow flow velocity than the usual Direct Simulation Monte Carlo method in case of long devices,and turns out to be accurate enough to compute macroscopic quantities like the pressure field in the *** simulations show the ability of the device to produce a one-way flow that has a pumping effect.

关键词： Knudsen compressor thermal creep flow transpiration flow BGK model implicit scheme

Numerical Study on Particle Motions in Swirling Flows in a Cyclone Separator

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2006年第2期15卷 181-185页

作者： Kazuyoshi MATSUZAKI Hideaki USHIJIMA Mizue MUNEKATA hideki OHBA Tokyo Electron LTD. 650 Mitsuzawa Hosaka-cho Nirasaki Yamanashi 407-0192 Japan Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 Japan

The purpose of this study is to establish the high-accurate prediction method of particle separation in a cyclone separator. Numerical simulation of the swirling flows in a cyclone separator is performed by using a large eddy simulation （LES） based on a Smagorinsky model. The validity of the simulation and the complicated flow characteristics are discussed by comparison with experimental results. Moreover, particle motions are treated by a Lagrangian method and are calculated with a one-way method. A performance for particle separation is predicted from the results of the particle tracing. As results of our investigation, the influences of the inserted height of the outlet pipe on the performance for particle separation of cyclone separator are shown.

关键词： cyclone separator swirling flow particle motion large eddy simulation

Quantitative evaluation of long-term liver repopulation and the reconstitution of bile ductules after hepatocellular transplantation

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第39期11卷 6176-6181页

作者： Yun-Wen Zheng Nobuhiro Ohkohchi hideki Taniguchi Department of Regenerative Medicine Graduate School of Medical Science Yokohama City University Yokohama 236-0004 Japan Department of Surgery Institute of Clinical Medicine University of Tsukuba Tsukuba 305-8575 Japan Research Unit for Organ Regeneration Center for Developmental Biology RIKEN Kobe 650-0047 Japan

AIM： The treatment of liver disease is severely limited by a shortage of donor livers. In trying to address this growing problem, hepatocellular transplantation （HTx） has received much attention as an alternative to whole organ transplant. However, the expansion of transplanted cells is at low level, and the reconstitution of functional liver tissue is limited by this cellular property. We set up an animal model to better understand cell dose effect and the kinetics of liver repopulation following HTx. METHODS： Dipeptidyl peptidase Ⅳ （DPPⅣ）-deficient rats treated with retrorsine and subjected to partial hepatectomy were infused with DPPⅣ-positive hepatocytes. Rats were injected with varying numbers of donor hepatocytes down to 100 cells low, and liver repopulation was examined at different time points up to 20 mo long. Repopulation was assessed by computer-aided quantitative detection. RESULTS： Transplanted hepatocytes underwent multiple rounds of proliferation and stably repopulated the injured livers after 20 mo and at all cell doses. Transplanted cells divided 14 times within the 3-mo time period following infusion, and the liver repopulation reached a plateau between 3 and 20 too. Approximately 90% replacement occurred. Donor-derived cells also reconstituted the bile ductules of the recipients. CONCLUSION： The ability of transplanted hepatocytes to fully reconstitute injured livers strongly supports further investigation into the clinical potential of HTx. Additionally, the observation that transplanted hepatocytes also form components of the biliary system suggests that these cells may have bi-potential property of the stem cells.

关键词： Hepatocellular transplantation Hepatic stem cell Kinetics Cell dose Long-term repopulation Bile ductules Quantification In viva, Therapeutic potential

Synchrotron X-ray diffraction techniques for in situ measurement of hydride formation under several gigapascals of hydrogen pressure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第36期59卷 5290-5301页

作者： Hiroyuki Saitoh Akihiko Machida Katsutoshi aoki Quantum Beam Science Directorate Japan Atomic Energy Agency Sayo-cho Sayo-gun Hyogo 679-5148 Japan Institute for Materials Research Tohoku University Aoba-kuSendai 980-8577 Japan

The high-pressure technique is a fundamental tool for realizing novel phase transitions, chemical reactions, and other exotic phenomena. Hydrogenation is one example of a high-pressure reaction; at high pressures of several gigapascals, hydrogen becomes chemically active and reacts with metals and alloys to form hydrides. This paper covers a high-pressure study of the hydrogenation process and the synthesis of hydrides using a cubic-type multi-anvil apparatus. The experimental details of a hydrogenation cell assembly, high-temperature and highpressure generation, and an in situ observation technique are presented. These experiments are conducted with the aid of in situ synchrotron radiation X-ray diffraction measurements operated in an energy-dispersive mode in the conventional manner for time-resolved measurements and a newly developed angle-dispersive mode for observation of the crystal growth process during formation of metal hydrides. Two successful cases of high-pressure hydrogenation are presented: aluminum hydride, Al H3, and an aluminum-based alloy hydride, Al2 Cu Hx, which are potential candidates for hydrogen storage materials.

关键词： X射线衍射技术金属氢化物原位测量氢气压力同步加速器同步辐射X射线衍射高压技术晶体生长过程

Graphene-Like Bilayer Hexagonal Silicon Polymorph

在线全文

学校读者我要写书评

暂无评论

Nano Research 2010年第10期3卷 694-700页

作者： Jaeil Bai hideki Tanaka Xiao Cheng Zeng Department of Chemistry and Nebraska Center for Materials and Nanoscience University of Nebraska-LincolnLincolnNebraska 68588USA Department of Chemistry Okayama UniversityOkayama 700-8530Japan

We present molecular dynamics simulation evidence for a freezing transition from liquid silicon to quasi-two-dimensional(quasi-2D)bilayer silicon in a slit *** new quasi-2D polymorph of silicon exhibits a bilayer hexagonal structure in which the covalent coordination number of every silicon atom is *** molecular dynamics simulations show that the stand-alone bilayer silicon(without the confinement)is still stable at 400 *** band-structure calculations suggest that the bilayer hexagonal silicon is a quasi-2D semimetal,similar to a graphene monolayer,but with an indirect zero band gap.

关键词： Bilayer hexagonal silicon slit pore semimetal two-dimensional polymorph

Moxibustion Promotes Formation of Granulation in Wound Healing Process through Induction of Transforming Growth Factor-β in Rats

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2020年第1期26卷 26-32页

作者： Hiroshi Kawanami Hirohisa Kawahata Hiroko-Miyuki Mori Motokuni aoki Graduate School of Health Sciences Morinomiya University of Medical Sciences

Objective:To examine the effect of moxibustion on the wound healing process and its mechanism using a rat wound ***:Sixty male Sprague-Dawley rats were randomly divided into a sham-treated group(n=30,wound surgery only)and a moxibustion group(n=30,wound treated with moxibustion).Circular fullthick ness skin wounds were produced in *** was applied to the edge of wound and was continued on alternating days till 14 days after surgery,followed by measurement of wound *** of collagens,prolyl-4-hydroxylase(P4H)and transtorming growth factor-β(TGF-β)were evaluated by histochemical study and real-time polymerase chain ***:The size of the wound lesion was significantly reduced in rats treated with moxibustion as compared to that in sham-treated rats at 4-10 days after wounding(P<0.01).Moxibusti on stimulated mRNA expressi on of collage ns at 4 days(P<0.01),but not at 7 days,accompa nied by enhanced proliferation of P4H-positive *** importanee,expression of TGF-β in tissue from the wound lesio n treated with moxibusti on was sign ifica ntly in creased as compared to that in sham-treated rats at 4 days(P<0.01 or P<0.05),but not at 7 ***:The treatment with moxibustion promoted the wound healing process in the early phase through proliferation of fibroblasts and rapid formation of granulation,possibly mediated by induction of TGF-β which is a key molecule in the physiological process of wound *** can be expected to be effective as complementary treatment for intractable ulcers.

关键词： compleme ntary and alter native medicine moxibusti on wound healing granulation tran storming growth factor-β collagen