Bibliographies thématiques / Axial and radial growth

Littérature scientifique sur le sujet « Axial and radial growth »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Axial and radial growth"

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Lohn, Andrew J., Kate J. Norris, Robert D. Cormia, Elane Coleman, Gary S. Tompa et Nobuhiko P. Kobayashi. « Effect of Doping on Nanowire Morphology during Plasma-assisted Chemical Vapor Deposition ». MRS Proceedings 1439 (2012) : 25–31. http://dx.doi.org/10.1557/opl.2012.941.

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ABSTRACTMorphologies of silicon nanowires grown by plasma-assisted metalorganic chemical vapor deposition were studied in the presence of various dopant precursors. The varied precursors affected the axial and radial growth rates over orders of magnitude where triethylborane showed the strongest enhancements for both axial and radial growth, and triethylarsenic and triethylantimony retarded axial growth. Native oxide thickness is also shown to depend strongly on doping condition resulting in increased oxide thicknesses for increased carrier concentration, using shifts in the measured binding energy of the silicon 2p3/2 state as a proxy for carrier concentration.
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Geelhaar, L., C. Chèze, W. M. Weber, R. Averbeck, H. Riechert, Th Kehagias, Ph Komninou, G. P. Dimitrakopulos et Th Karakostas. « Axial and radial growth of Ni-induced GaN nanowires ». Applied Physics Letters 91, no 9 (27 août 2007) : 093113. http://dx.doi.org/10.1063/1.2776979.

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Misra, R. K., A. R. Dexter et A. M. Alston. « Maximum axial and radial growth pressures of plant roots ». Plant and Soil 95, no 3 (octobre 1986) : 315–26. http://dx.doi.org/10.1007/bf02374612.

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Dubrovskii, Vladimir G. « Theory of MBE Growth of Nanowires on Reflecting Substrates ». Nanomaterials 12, no 2 (14 janvier 2022) : 253. http://dx.doi.org/10.3390/nano12020253.

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Selective area growth (SAG) of III-V nanowires (NWs) by molecular beam epitaxy (MBE) and related epitaxy techniques offer several advantages over growth on unpatterned substrates. Here, an analytic model for the total flux of group III atoms impinging NWs is presented, which accounts for specular re-emission from the mask surface and the shadowing effect in the absence of surface diffusion from the substrate. An expression is given for the shadowing length of NWs corresponding to the full shadowing of the mask. Axial and radial NW growths are considered in different stages, including the stage of purely axial growth, intermediate stage with radial growth, and asymptotic stage, where the NWs receive the maximum flux determined by the array pitch. The model provides good fits with the data obtained for different vapor–liquid–solid and catalyst-free III-V NWs.
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Ponsurya, P., Shahid Hussain, B. H. Abbas Shahul Hameed, R. Perumalsamy, R. Thirumamagal, M. Jayachandran et A. Ayeshamariam. « Studies on Growth Mechanism of Annealed Graphite Powder and Gas-Sensor Applications ». Materials Science Forum 832 (novembre 2015) : 102–9. http://dx.doi.org/10.4028/www.scientific.net/msf.832.102.

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High quality micro sheet rhombohedral graphite crystals were synthesized by Hummer method using compounds of MWCNT, K2S2O8and P2O5. The growth mechanisms were discussed by finite element simulation. The synthetic sheet rhombohedral graphite crystals showed a higher growth rate in radial direction than that in axial direction. Raman spectrum and Fourier transform infrared spectrum indicated that synthesized sheet rhombohedral Graphite had fewer crystal lattice distortions with no impurities. Finite element simulations indicated that the solvent metal convection field in the radial direction was stronger than that in the axial direction. As prepared graphite powder was annealed at 1350 oC to obtain diamond nanoparticles. The as-prepared products were exposed to formaldehyde gas.
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Prato, J., et B. Lakshminarayana. « Investigation of Compressor Rotor Wake Structure at Peak Pressure Rise Coefficient and Effects of Loading ». Journal of Turbomachinery 115, no 3 (1 juillet 1993) : 487–500. http://dx.doi.org/10.1115/1.2929279.

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This paper reports an experimental study of the three-dimensional characteristics of the mean velocity in the trailing-edge, near-wake, and far-wake regions of a highly loaded low-speed compressor rotor. The wake structure and decay characteristics are compared with the wake data in the same compressor with moderate loading. The experimental investigation was carried out using a rotating five-hole probe. The flow field was surveyed at various radial and axial locations downstream of the compressor rotor. Variations in the axial, tangential, and radial components of mean velocity at various axial and radial locations were derived from the data and compared with earlier data at lower loading to discern the effects of loading. It was found that the higher loading had the following effects: Higher total velocity defects were observed in the hub-wall region, increased wake growth rate in the tip region, faster decay of static pressure difference in the trailing-edge region, larger initial wake width in the trailing-edge region, increased rate of growth of the semi-wake width in the trailing-edge region, increased decay rate of radial velocity in the trailing-edge region, and decreased decay rate of the radial velocity in the far-wake region. Far wake properties were almost identical in both cases.
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NEMOTO, Keisuke, et Koou YAMAZAKI. « Allometric relationships between axial and radial stem growth in rice plants. » Japanese journal of crop science 58, no 1 (1989) : 55–59. http://dx.doi.org/10.1626/jcs.58.55.

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Arif, Omer, Valentina Zannier, Francesca Rossi, Daniele Ercolani, Fabio Beltram et Lucia Sorba. « Self-Catalyzed InSb/InAs Quantum Dot Nanowires ». Nanomaterials 11, no 1 (13 janvier 2021) : 179. http://dx.doi.org/10.3390/nano11010179.

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The nanowire platform offers great opportunities for improving the quality and range of applications of semiconductor quantum wells and dots. Here, we present the self-catalyzed growth of InAs/InSb/InAs axial heterostructured nanowires with a single defect-free InSb quantum dot, on Si substrates, by chemical beam epitaxy. A systematic variation of the growth parameters for the InAs top segment has been investigated and the resulting nanowire morphology analyzed. We found that the growth temperature strongly influences the axial and radial growth rates of the top InAs segment. As a consequence, we can reduce the InAs shell thickness around the InSb quantum dot by increasing the InAs growth temperature. Moreover, we observed that both axial and radial growth rates are enhanced by the As line pressure as long as the In droplet on the top of the nanowire is preserved. Finally, the time evolution of the diameter along the entire length of the nanowires allowed us to understand that there are two In diffusion paths contributing to the radial InAs growth and that the interplay of these two mechanisms together with the total length of the nanowires determine the final shape of the nanowires. This study provides insights in understanding the growth mechanisms of self-catalyzed InSb/InAs quantum dot nanowires, and our results can be extended also to the growth of other self-catalyzed heterostructured nanowires, providing useful guidelines for the realization of quantum structures with the desired morphology and properties.
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Cao, Bing Qiang, Hao Ming Wei, Xi Lun Hu et Hai Bo Gong. « Polar and Nonpolar ZnO Nanowire QWs Grown with PLD Using Nanowire Arrays with Tuning Density as Physical Templates ». Materials Science Forum 688 (juin 2011) : 207–12. http://dx.doi.org/10.4028/www.scientific.net/msf.688.207.

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The encountered difficulties that prevent ZnO nanowires from being used as light-emitters are p-type doping and quantum well (QW) integration. The growth of homogenous nanowire quantum wells is usually influenced by the shadowing effect associated with nanowire growth density. In this paper, based on the growth density control of nanowire array, a new two-step pulsed laser deposition (PLD) strategy was demonstrated to grow two kinds of ZnO nanowire QWs, e.g. radial nonpolar QW and axial polar QW. The growth-density control of ZnO nanowires was realised by introducing a wetting layer and adjusting the substrate-target distances. The structural and optical characterizations of these two kinds of nanowire QWs prove that the radial nanowire QWs are more homogenous than axial QWs, which also show better optical properties.
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Sherwood, Owen A., et Evan N. Edinger. « Ages and growth rates of some deep-sea gorgonian and antipatharian corals of Newfoundland and Labrador ». Canadian Journal of Fisheries and Aquatic Sciences 66, no 1 (janvier 2009) : 142–52. http://dx.doi.org/10.1139/f08-195.

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Using bomb-14C dating and growth ring counting methods, we calculate life spans and growth rates of six species of deep-sea corals collected at depths of between 400 and 900 m from the continental slope of Newfoundland and Labrador. Bamboo corals ( Acanella arbuscula , Keratoisis ornata ) and antipatharians ( Stauropathes arctica ) secrete concentric growth rings in their axial skeletons, which were proven to form annually for K. ornata and S. arctica. These species had the lowest radial growth rates of 33 ± 11 to 75 ± 11 μm·year–1. Primnoa resedaeformis and Paramuricea spp. had higher radial growth rates of 83 ± 6 to 215 ± 37 μm·year–1. Paragorgia arborea had the highest radial growth rate of 830 ± 120 μm·year–1. Axial growth rates ranged from 0.56 ± 0.05 cm·year–1 for a specimen of Paramuricea spp. to 2.61 ± 0.45 cm·year–1 for a specimen of Primnoa resedaeformis . Life spans ranged from 18 ± 4 years for a live-collected P. resedaeformis to 200 ± 30 years for a subfossil specimen of K. ornata. Because all of the corals were from heavily fished areas, it is likely that age distributions are biased towards smaller and younger colonies. Recovery of deep-sea corals from fishing-induced damage will take decades to centuries.
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Thèses sur le sujet "Axial and radial growth"

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Gomes, Umesh Prasad. « Catalyst-assisted and catalyst-free growth of III-V semiconductor nanowires ». Doctoral thesis, Scuola Normale Superiore, 2017. http://hdl.handle.net/11384/85884.

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The aim of this thesis is to understand the dynamics of the nucleation and growth of III-V semiconductor nanowires and associated heterostructures grown by chemical beam epitaxy. These nanowires represent well-controlled and high quality materials suitable for both fundamental physics and applications in optical and electronic devices. The first part of the thesis investigates growth recipes to obtain Au-catalyzed InAs NWs with controlled morphology. Good control of NW length and diameter distributions has been achieved by a systematic study of two different Au deposition techniques: Au thin film deposition and colloidal dispersion. Triggered by the issues of Au contamination and CMOS compatibility, the second part of the thesis is dedicated to the investigation of the nucleation and growth mechanisms of Au-free InAs NWs on Si (111) substrates. A thorough analysis of the silicon substrate preparation is conducted and an optimized silicon surface for the nucleation of Au-free nanowires is identified. We show that the silicon surface can be modified by in situ and ex situ parameters allowing us to control the density of NWs. Growth conditions were established for growing InAs NWs either by catalyst-free or self-catalyzed mechanisms on Si (111). The catalyst-free growth proceeds in the vapor-solid growth mechanism without the use of any catalyst particle while the self-catalyzed growth proceeds in the vapor-liquid-solid mechanism involving a liquid In droplet. Growth models are proposed in order to interpret the experimental findings. The third part of the thesis concerns the growth of axial and radial (core-shell) heterostructured NWs. Nanowire heterostructures combining either highly lattice mismatched materials (GaAs and InAs) or almost lattice matched materials (InAs and GaSb) are investigated. GaAs/InAs and InAs/GaAs axial heterostructures are grown by Au-catalyzed method. Here, it is demonstrated that the catalyst composition, rather than other growth parameters, as postulated so far, controls the growth mode and the resulting NW morphology. We have also explored the growth of core-shell InAs/GaSb heterostructures by catalyst-free mechanism. The morphology and structural properties of InAs/GaSb core-shell heterostructures are optimized to fabricate Esaki tunnel diodes exploiting their broken-gap band alignment.
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Sulistyo, Hary. « Axial and radial heat transport in packed beds ». Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293824.

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Spakovszky, Zoltán S. (Zoltán Sándor) 1972. « Applications of axial and radial compressor dynamic system modeling ». Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8888.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, February 2001.
Includes bibliographical references (p. 255-262).
The presented work is a compilation of four different projects related to axial and centrifugal compression systems. The projects are related by the underlying dynamic system modeling approach that is common in all of them. Two types of models are introduced, suitable for modeling the dynamic behavior of axial and centrifugal compression systems: a compact single semi-actuator disk model, Model I, and a new modular multi semi-actuator disk model, Model II. The first project analyzes aerodynamically induced whirling forces in axial-flow compressors and a new unsteady low order model is introduced to predict the destabilizing whirling forces. The model consists of two parts: compressor Model I with the effect of tip-clearance induced distortion, and an aerodynamically induced force model. The modeling results are compared to experimental data obtained from the GE Aircraft Engines test program on compressor whirl. Previously outstanding whirl-instability issues are resolved, including prediction of the direction and magnitude of rotor whirl-inducing forces; such issues are important in the design of modern axial-flow compressors.
(cont.) Additional insight is gained from the model on the effects of forced rotor whirl. In particular, a non-dimensional parameter is deduced that determines the direction of rotor whirl tendency in both compressors and turbines due to tangential blade loading forces. The second project is a first-of-a-kind feasibility study of an active stall control experiment with a mag- netic bearing servo-actuator in the NASA Glenn high-speed single-stage compressor test facility. Together with CFD and experimental data the tip-clearance sensitive compressor Model I was used in a stochastic estimation and control analysis to determine the required magnetic bearing performance for compressor stall control. A magnetic bearing servo-actuator was designed that fulfilled the performance specifications, setting a milestone in magnetic bearing development for aero-engine applications. Control laws were then developed to stabilize the compressor shaft. In a second control loop, a constant gain controller was imple- mented to stabilize rotating stall. A detailed closed loop simulation at 100% corrected design speed resulted in a 2.3% reduction of stalling mass flow which is comparable to results obtained in the same compressor using unsteady air injection.
(cont.) The third project is the investigation of unsteady impeller-diffuser interaction effects on compressor stability. First, the unsteady blade-row interaction in axial compressors is analyzed using Model II. The results reveal a new signature of pre-stall waves that travel backward, altering the system dynamics when rotor and stator are moderately coupled. The physical mechanism for this behavior is explained from first principles and a coupling criterion is presented. The theory is then applied to centrifugal compressors and in particular to the NASA CC3 high-speed centrifugal compressor, in which experiments are conducted to verify the model predictions. The measurements show the predicted behavior and confirm the existence of backward traveling stall pre-cursors. The fourth project is an experimental demonstration of stability enhancement in the NASA CC3 high-speed centrifugal compressor with air injection. Based ...
by Zoltán Spakovszky.
Ph.D.
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Renzetti, Andrew John. « Radial and Axial Designs for Magnetic Absorbent Collector in Water ». Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707371/.

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The use of collection systems for magnetic sorbents such as Magnetic Activated Carbon are discussed in order to gauge their efficacy in marine environments. Two collectors were built and tested, one which utilized a radial orientation of magnets and another with axially placed magnets. The two systems underwent a series of test with differing linear velocities and angular velocities. From the results, the axial system outperformed its radial counterpart, being most effective with a relatively high concentration of discs placed in series. The medium concentration, however, proved increasingly effective with higher velocities, meaning an optimization concentration exists for this design. The radial system was tested with high and low concentrations of small and large magnets, respectively. The larger magnets, although providing less concentration points in the alternating array, proved more effective for the collection of MAC. From these tests several new innovations were suggested, including belt tensioners, add on mechanisms, and a hybridized design in order to fully optimize the collection of MAC.
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Kneissler, Andreas. « Multisensor-Strategie zur Optimierung des Anwalzverhaltens beim Radial-Axial-Ringwalzen ». Aachen Shaker, 2008. http://d-nb.info/993898289/04.

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Golz, Jan. « Prozesssynchrone Simulation der Temperaturverteilung in radial-axial gewalzten Ringen mit Rechteckquerschnitt ». Aachen Shaker, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017047408&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Kraus, Peter. « Optimierung eines Axial-Radial-ND-Abströmgehäuses hinsichtlich des Wirkungsgrades sowie der Stossoszillation ». [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965520471.

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Kneißler, Andreas [Verfasser]. « Multisensor-Strategie zur Optimierung des Anwalzverhaltens beim Radial-Axial-Ringwalzen / Andreas Kneißler ». Aachen : Shaker, 2009. http://d-nb.info/1126378577/34.

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Fleischer, Erik [Verfasser]. « Entwurf, Modellierung und nichtlineare Regelung eines integrierten Radial-Axial-Magnetlagers / Erik Fleischer ». Aachen : Shaker, 2018. http://d-nb.info/1161299262/34.

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Müller, Lasse. « Adjoint-Based Optimization of Turbomachinery With Applications to Axial and Radial Turbines ». Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/280380/5/contratLM.pdf.

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Numerical optimization methods have made significant progress over the last decades and play an important role in modern industrial design processes. In most cases, gradient-free algorithms are used, which only require the value of the objective function in each optimization step. These methods are robust and can be integrated into a standard design process at low implementation effort. However, in aerodynamic design problems using high-fidelity Computational Fluid Dynamics (CFD), the computational cost is high, especially when a large number of design parameters are used. Gradient-based methods, on the other hand, are particularly suited for problems involving large design spaces and generally converge to a local optimum in a few design cycles. However, the computational efficiency of these methods is mainly determined by the gradient calculation.This thesis presents the development of an efficient gradient-based optimization framework for the aerodynamic design of turbomachinery applications. In particular, the adjoint approach is used to evaluate the gradients of the objective function with respect to all design parameters at low computational cost. The present work covers the various components of the optimization framework, including the solution of the flow governing equations, adjoint-based sensitivity analysis, geometry parameterization, and mesh generation. A substantial part of the thesis describes the implementation and validation of those components. The flow solver is a Reynolds-Averaged Navier-Stokes code applicable to multiblock structured grids. The spatial discretization is realized with a Roe-type upwind scheme with a MUSCL extrapolation for second order spatial accuracy. Viscous fluxes are centrally discretized, and for the turbulence closure problem the Spalart-Allmaras and the Shear-Stress Transport (SST) models are used. The code uses an implicit multistage Runge-Kutta time-stepping scheme, accelerated by local time-stepping and geometric multigrid. The corresponding discrete adjoint solver uses the same time marching scheme as the flow solver and features similar performance characteristics in terms of runtime and memory footprint. The adjoint solver has been implemented primarily by hand with selective use of algorithmic differentiation (AD) to simplify the development. The geometry parameterization is based on B-Spline representations which has two main advantages: (a) the simple integration of geometric constraints for structural requirements, and (b) the connection to Computer-Aided Design (CAD) software for manufacturing. The whole optimization framework is driven by a Sequential Quadratic Programming (SQP) algorithm. The proposed framework has been successfully applied to optimize axial and radial turbines on multiple operating points subject to aerodynamic and geometric constraints. The different studies show the effectiveness of the developed method in terms of improved performances and computational cost. In particular, a comparative study shows that the proposed method is able to find optimized blade shapes at a computational time which is about one order of magnitude lower compared to a gradient-free optimization algorithm.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
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Livres sur le sujet "Axial and radial growth"

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Anderson, Sterling J. Capability evaluation of the radial-axial splitter. [Pittsburgh, Pa.] : U.S. Dept. of the Interior, Bureau of Mines, 1987.

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Sulistyo, Hary. Axial and radial heat transport in packed beds. Salford : University of Salford, 1991.

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Eck, Bruno. Ventilatoren : Entwurf und Betrieb der Radial-, Axial- und Querstromventilatoren. 5e éd. Berlin : Springer-Verlag, 1991.

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Eck, Bruno. Ventilatoren : Entwurf und Betrieb der Radial-, Axial- und Querstromventilatoren. 6e éd. Berlin : Springer, 2003.

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United States. National Aeronautics and Space Administration., dir. An interactive grid generation procedure for axial and radial flow turbomachinery. [Washington, DC?] : National Aeronautics and Space Administration, 1990.

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Abrinia, K. An i nvestigation into the mechanism of radial-axial ring rolling. Manchester : UMIST, 1985.

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Turbine aerodynamics : Axial-flow and radial-inflow turbine design and analysis. New York : ASME Press, 2006.

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Institution of Mechanical Engineers (Great Britain). Fluid Machinery Committee., dir. Radial loads and axial thrusts on centrifugal pumps : Papers presented at a seminar. London : The Institution, 1986.

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United States. Cooperative State Research Service. et Canada/United States Spruce Budworms Program., dir. Using dendrochronology to measure radial growth of defoliated trees. [Washington, D.C.?] : U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service, 1985.

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Otomo, Noboru. A study of mixing with dual radial and dual axial flow impellers : Blending and power characteristics. Birmingham : University of Birmingham, 1995.

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Chapitres de livres sur le sujet "Axial and radial growth"

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Mohamad, A. A. « Axial and Radial Porous Burners ». Dans Emerging Technologies and Techniques in Porous Media, 367–79. Dordrecht : Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-007-0971-3_24.

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Dick, Erik. « Axial and Radial Turbines for Gases ». Dans Fundamentals of Turbomachines, 535–59. Dordrecht : Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9627-9_15.

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Yedidiah, Sam. « Axial and Radial Thrust and Balancing ». Dans Centrifugal Pump User’s Guidebook, 97–110. Boston, MA : Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1217-8_10.

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Dick, Erik. « Axial and Radial Turbines for Gases ». Dans Fundamentals of Turbomachines, 571–96. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93578-8_15.

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Adams, Maurice L. « Radial and Axial Rotor Force Design Technology ». Dans Rotating Machinery Research and Development Test Rigs, 1–21. Boca Raton : Taylor & Francis, CRC Press, [2017] : CRC Press, 2017. http://dx.doi.org/10.1201/9781315116723-1.

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Boden, Karl. « Wide-Gap, Electro-Permanentmagnetic Bearing System with Radial Transmission of Radial and Axial Forces ». Dans Magnetic Bearings, 41–52. Berlin, Heidelberg : Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_5.

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Scherrer, Benoit, Maxime Taquet, Armin Schwartzman, Etienne St-Onge, Gaetan Rensonnet, Sanjay P. Prabhu et Simon K. Warfield. « Decoupling Axial and Radial Tissue Heterogeneity in Diffusion Compartment Imaging ». Dans Lecture Notes in Computer Science, 440–52. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59050-9_35.

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Fremerey, Johan K. « Radial Shear Force Permanent Magnet Bearing System with Zero-Power Axial Control and Passive Radial Damping ». Dans Magnetic Bearings, 25–31. Berlin, Heidelberg : Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_3.

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Meier, H., J. Briselat, R. Hammelmann et H. Flick. « Image Processing Methods for Online Measurement in Radial-Axial Ring Rolling ». Dans Proceedings of the 36th International MATADOR Conference, 355–58. London : Springer London, 2010. http://dx.doi.org/10.1007/978-1-84996-432-6_80.

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Miao, Q., J. Zhu, S. Barghl, C. Wanfi, X. L. Yin et C. Z. Wu. « Axial and Radial Solids Holdup Modeling of Circulating Fluidized Bed Risers ». Dans Proceedings of the 20th International Conference on Fluidized Bed Combustion, 335–40. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02682-9_48.

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Actes de conférences sur le sujet "Axial and radial growth"

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Wan, Richard G., et Jin Wang. « Modeling Sand Production and Erosion Growth under Combined Axial and Radial Flow ». Dans SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference. Society of Petroleum Engineers, 2002. http://dx.doi.org/10.2118/80139-ms.

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Jackson, Andrew D. « Stall Cell Development in an Axial Compressor ». Dans ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-249.

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An experimental investigation of stall inception and stall cell development in a single stage axial compressor is described. The stall inception was found to be naturally non-random: by artificially perturbing the flow the inception could be accurately fixed at a known location in the compressor. The stall cell was first detected behind the rotor at a small distance from the tip. The stall cell grew very rapidly in circumferential extent, but slowly in radial extent. After reaching the hub the cell decreased in size before reaching full development as a single full span rotating stall cell. Relationships between various parameters of the stall cell growth are presented. The growth is explained in terms of the cell blockage, and the mechanism for multiple stall inception is discussed.
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Cao, B. Q., X. L. Hu, H. M. Wei et H. Y. Xu. « Radial and axial nanowire heterostructures grown with ZnO nanowires as templates ». Dans 2010 IEEE Region 10 Conference (TENCON 2010). IEEE, 2010. http://dx.doi.org/10.1109/tencon.2010.5686470.

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Ma, R. H., H. Zhang, M. Dudley et V. Prasad. « Thermal System Design and Dislocation Reduction for Growth of Wide Bandgap Crystals ». Dans ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47564.

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In SiC vapor growth, micropipes and dislocations that originate at the seed/boule interface can continuously propagate into the newly grown crystal. They adversely affect the quality of the crystals. The defect density can be reduced by the method of growing a large diameter crystal from a small seed through lateral growth under controlled thermal environment. In this paper, SiC growth processes with varying thermal conditions have been simulated. The effects of operational parameters such as axial and radial temperature gradients, and the presence of polycrystal are also investigated. The current finding can also help in the design of AlN/GaN growth system.
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Wang, Baolu, Qitai Eri, Ting Li et Ran Duan. « Experimental Investigation on the Effect of Oxygen Enhancement on Radiation Distribution in Inverse Diffusion Flames ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65036.

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Intense investigations have been focused on radiative heat transfer in oxygen-enhanced inverse diffusion flames since it plays a significant role not only in fundamental combustion research, but also in terrestrial and spacecraft fire safety study. To investigate the characteristics of the radiative heat transfer, a calibrated mid-infrared camera was used to acquire images of radiation intensity including soot and carbon dioxide in the 2–5μm wavelength range. The mole fraction of oxygen in the oxidizer varied from 21% to 100% with co-flowing inverse flame burner used to stabilize the flames. The characteristics of axial and radial radiation intensity distribution in different oxygen enhanced conditions are compared and analyzed. The results indicated that oxygen enhancement broadens the radial range of inner blue reaction zone and stretches the axial height of the plume zone. Similar to radial peak radiation intensity value and the growth rate of radial radiation intensity in different axial heights from X = 1D to X = 3D (X: axial height above the burner along the flame centerline; D: diameter of oxidizer exit), the peak value of radiation intensity and the growth rate of radiation intensity along the flame centerline both have a positive linear relationship with the oxygen mole fraction in the oxidizer.
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Prato, J., et B. Lakshminarayana. « Investigation of Compressor Rotor Wake Structure at Peak Pressure Rise Coefficient and Effects of Loading ». Dans ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-032.

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This paper reports an experimental study of the three-dimensional characteristics of the mean velocity in the trailing-edge, near-wake and far-wake regions of a highly loaded low-speed compressor rotor. The wake structure and decay characteristics are compared with the wake data in the same compressor with moderate loading. The experimental investigation was carried out using a rotating five-hole probe. The flow field was surveyed at various radial and axial locations downstream of the compressor rotor. Variations in the axial, tangential and radial components of mean velocity at various axial and radial locations were derived from the data and compared with earlier data at lower loading to discern the effects of loading. It was found that the higher loading had the following effects: Higher total velocity defects were observed in the hub-wall region, increased wake growth rate in the tip region, faster decay of static pressure difference in the trailing-edge region, larger initial wake width in the trailing-edge region, increased rate of growth of the semi-wake width in the trailing-edge region, increased decay rate of radial velocity in the trailing-edge region and decreased decay rate of the radial velocity in the far-wake region. Far wake properties were almost identical in both cases.
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Sambandam, Manoharan, et Simone Colantoni. « Gas Turbine Transition Duct Gap Assessment for Unsymmetrical Thermal Boundary Conditions ». Dans ASME Turbo Expo 2022 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-81672.

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Abstract The transition duct (TD) in a gas turbine (GT) twin shaft variant provides an aerodynamic coupling between its high-pressure gas generator module and low-pressure power module. Since the TD defines the flow passage, it interfaces with the high-pressure rotor and shroud at the forward end and the low-pressure rotor and stator at the aft end. Normally, the GT twin shaft variant is equipped with part-load capability. To fulfill this need and to comply with the emission norms, only desired number of burners, adjacent to each other, are used to burn fuel. Using some of the burners during the GT operation is referred to as staging. The GT operation under staging conditions result in non-uniform temperature distribution in the angular locations at any axial position and thus non-uniform thermal growth in the radial and axial directions. This non-uniform thermal growth in radial and axial direction leads to the interface definition very challenging. During the staging operation, the rotor parts experiences uniform radial and axial growth at all the angular locations. Whereas the interfacing stator parts experience temperature distribution like that of the TD and results in non-uniform thermal growth in the radial and axial directions. Appropriate interface definition is vital for efficient operation of the GT. Any interference condition of the TD with rotating parts result in rubbing and with stationary parts result in thermal binding, impacting the GT normal operation. Any generous gap adversely impacts the GT performance due to consumption of more cooling medium. Thus, an assembly gap which results in no interference and consumption of less cooling medium throughout the staging operation is considered as optimum assembly gap. Thorough gapping assessment is performed considering all the transient time points to ensure that the gap values are set optimally. This paper is intended to describe the steps followed in assessing the anticipated interference and gap situations at various interfaces.
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Gutkin, Leonid, et Douglas A. Scarth. « Multi-Variable Engineering Model for Axial Delayed Hydride Cracking Growth Rate in Pre-Irradiated Zr-2.5%Nb ». Dans ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77995.

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The growth rate of postulated delayed hydride cracks in CANDU Zr-2.5%Nb pressure tubes is an important material property required for flaw evaluations and leak-before-break assessments. It is monitored using surveillance pressure tubes according to the requirements of the Canadian Standards Association (CSA) Standard N285.4 [1]. Radial growth rate and axial growth rate are used to calculate the propagation of delayed hydride cracks in the through-wall direction and along the pressure tube length, respectively. The axial delayed hydride cracking growth rate had been previously found to increase exponentially with inverse absolute test temperature. This dependence had been described by an Arrhenius-type regression model with one explanatory variable. As more experimental results were obtained from surveillance pressure tubes, it has become possible to assess whether there may be statistically significant effects of other variables, which should be incorporated into the representative relation for the axial delayed hydride cracking growth rate. In this paper, multi-variable regression analysis has been used to develop an improved representative model for the axial delayed hydride cracking growth rate of irradiated Zr-2.5%Nb pressure tube material. The developed model explains approximately 93% of overall observed variation in the experimental data, and therefore has better predictive capabilities than the reference regression model with test temperature as a sole predictor. The developed multi-variable model is proposed to be incorporated into the scheduled revision (2010 edition) of the CSA Standard N285.8 as the representative predictive model.
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Xu, Yan, Zunce Wang, Fengxia Lv et Sen Li. « Study on Characteristics and Operating Parameters of Axial Rotating Hydrocyclone ». Dans ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79114.

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The axial rotation of the hydrocyclone affects its internal flow characteristics and separating effect directly, as some local applications require the static hydrocyclone rotates about its own axis. Based on CFD, velocity distribution in the axial rotating hydrocyclone is studied. It is shown that as the rotation speed increasing, the tangential velocity improves and its gradient reduces in free vortex region observably, while the radial velocity has an incremental trend in the section of the small cone. The laboratory experiments are carried out for the static hydrocyclone of disposal capacity of 4 m3/h at 100r/min ∼ 300r/min. The relationships among rotation speed, flowrate, pressure drop and separated efficiency are achieved, which agree well with the numerical simulation results. The results indicate that the disposal capacity of hydrocyclone subjected to the rotation wall can be more flexible than that with no-rotating wall, the scope of best disposal capacity gradually enlarges with the increase of rotation speed of wall. Appropriate rise of the rotation speed is favor of the separation efficiency at the steady flowrate, however the increase of the flowrate and rotation speed induces the growth of the hydrocyclone’s pressure drop correspondingly to some extent.
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Dann, Andrew G., Steve J. Thorpe, Leo V. Lewis et Peter Ireland. « Innovative Measurement Techniques for a Cooled Turbine Casing Operating at Engine Representative Thermal Conditions ». Dans ASME Turbo Expo 2014 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26092.

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To optimize the efficiency of modern aero-gas turbine engines the turbine tip clearances must be tightly controlled so as to minimize leakage losses. In addition, the clearance control system must be able to respond with sufficient rapidity to engine thermal transients. One method of achieving turbine tip-clearance control is to manipulate the turbine casing temperature, and thereby radial growth, by convective cooling. The consequent clearance control system represents a particularly complex thermo-mechanical design problem. The current experimental study aims to simulate the heat loads to which the internal surfaces of the casing are typically exposed and to characterize the radial and axial displacement of the free-body casing under varying external cooling conditions. Importantly, the newly commissioned test facility allows a realistic assessment of the casing cooling impact on dimensional control, and also the rapid characterization and comparison of different concepts. The test facility comprises a model of a high-pressure/intermediate-pressure turbine casing with generic impingement cooling manifolds. A radiant heater is mounted within the casing model such that a near-uniform heat flux condition can be established on the casing wall inner surface. Extensive surface mounted thermocouples are welded to the casing wall to monitor variations in metal temperature. Radial and axial displacement of the casing is monitored using laser triangulation and linear variable differential transformer sensors. Experiments have been conducted over a range of heat load conditions and with engine representative levels of casing cooling applied. Importantly, the new test facility allows for the characterization of the casing cooling system as a whole.
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Rapports d'organisations sur le sujet "Axial and radial growth"

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Chen, Jenping, Roberts S. Webster, Michael D. Hathaway, Gregory P. Herrick et Gary J. Skoch. Numerical Simulation of Stall and Stall Control in Axial and Radial Compressors. Fort Belvoir, VA : Defense Technical Information Center, juin 2006. http://dx.doi.org/10.21236/ada455274.

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Peterson, Gregory W., Christoper J. Karwacki et Joseph A. Rossin. Novel Collective Protection Filters for Emerging TIC Requirements : Axial and Radial-Flow Filter Designs. Fort Belvoir, VA : Defense Technical Information Center, mai 2007. http://dx.doi.org/10.21236/ada468847.

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Liu, C. T., et M. Tam. Investigating the Crack Growth Behavior in a Particulate Composite Material Under Multi-Axial Loading Conditions. Fort Belvoir, VA : Defense Technical Information Center, février 2003. http://dx.doi.org/10.21236/ada410751.

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Liu, C. T., et M. Tam. Investigating the Crack Growth Behavior in a Particulate Composite Material Under Multi-Axial Loading Conditions. Fort Belvoir, VA : Defense Technical Information Center, novembre 2002. http://dx.doi.org/10.21236/ada410936.

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Adams, H., S. McLaughlin, T. Blasing et D. Duvick. A survey of radial growth trends in spruce in the Great Smoky Mountains National Park as influenced by topography, age, and stand development. Office of Scientific and Technical Information (OSTI), février 1990. http://dx.doi.org/10.2172/6992087.

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Wickman, Boyd E. Radial growth of grand fir and Douglas-fir 10 years after defoliation by the Douglas-fir tussock moth in the Blue Mountains outbreak. Portland, OR : U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1986. http://dx.doi.org/10.2737/pnw-rp-367.

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Siekhaus, W., et C. Hrousis. Analysis of Axial Growth of Gold Indide by Indium Diffusing away from Solder Mounds and Creating the Gold to Gold-Indide Interface Angle Inside the Solder Mounds. Office of Scientific and Technical Information (OSTI), février 2011. http://dx.doi.org/10.2172/1068281.

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Epel, Bernard L., Roger N. Beachy, A. Katz, G. Kotlinzky, M. Erlanger, A. Yahalom, M. Erlanger et J. Szecsi. Isolation and Characterization of Plasmodesmata Components by Association with Tobacco Mosaic Virus Movement Proteins Fused with the Green Fluorescent Protein from Aequorea victoria. United States Department of Agriculture, septembre 1999. http://dx.doi.org/10.32747/1999.7573996.bard.

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The coordination and regulation of growth and development in multicellular organisms is dependent, in part, on the controlled short and long-distance transport of signaling molecule: In plants, symplastic communication is provided by trans-wall co-axial membranous tunnels termed plasmodesmata (Pd). Plant viruses spread cell-to-cell by altering Pd. This movement scenario necessitates a targeting mechanism that delivers the virus to a Pd and a transport mechanism to move the virion or viral nucleic acid through the Pd channel. The identity of host proteins with which MP interacts, the mechanism of the targeting of the MP to the Pd and biochemical information on how Pd are alter are questions which have been dealt with during this BARD project. The research objectives of the two labs were to continue their biochemical, cellular and molecular studies of Pd composition and function by employing infectious modified clones of TMV in which MP is fused with GFP. We examined Pd composition, and studied the intra- and intercellular targeting mechanism of MP during the infection cycle. Most of the goals we set for ourselves were met. The Israeli PI and collaborators (Oparka et al., 1999) demonstrated that Pd permeability is under developmental control, that Pd in sink tissues indiscriminately traffic proteins of sizes of up to 50 kDa and that during the sink to source transition there is a substantial decrease in Pd permeability. It was shown that companion cells in source phloem tissue export proteins which traffic in phloem and which unload in sink tissue and move cell to cell. The TAU group employing MP:GFP as a fluorescence probe for optimized the procedure for Pd isolation. At least two proteins kinases found to be associated with Pd isolated from source leaves of N. benthamiana, one being a calcium dependent protein kinase. A number of proteins were microsequenced and identified. Polyclonal antibodies were generated against proteins in a purified Pd fraction. A T-7 phage display library was created and used to "biopan" for Pd genes using these antibodies. Selected isolates are being sequenced. The TAU group also examined whether the subcellular targeting of MP:GFP was dependent on processes that occurred only in the presence of the virus or whether targeting was a property indigenous to MP. Mutant non-functional movement proteins were also employed to study partial reactions. Subcellular targeting and movement were shown to be properties indigenous to MP and that these processes do not require other viral elements. The data also suggest post-translational modification of MP is required before the MP can move cell to cell. The USA group monitored the development of the infection and local movement of TMV in N. benthamiana, using viral constructs expressing GFP either fused to the MP of TMV or expressing GFP as a free protein. The fusion protein and/or the free GFP were expressed from either the movement protein subgenomic promoter or from the subgenomic promoter of the coat protein. Observations supported the hypothesis that expression from the cp sgp is regulated differently than expression from the mp sgp (Szecsi et al., 1999). Using immunocytochemistry and electron microscopy, it was determined that paired wall-appressed bodies behind the leading edge of the fluorescent ring induced by TMV-(mp)-MP:GFP contain MP:GFP and the viral replicase. These data suggest that viral spread may be a consequence of the replication process. Observation point out that expression of proteins from the mp sgp is temporary regulated, and degradation of the proteins occurs rapidly or more slowly, depending on protein stability. It is suggested that the MP contains an external degradation signal that contributes to rapid degradation of the protein even if expressed from the constitutive cp sgp. Experiments conducted to determine whether the degradation of GFP and MP:GFP was regulated at the protein or RNA level, indicated that regulation was at the protein level. RNA accumulation in infected protoplast was not always in correlation with protein accumulation, indicating that other mechanisms together with RNA production determine the final intensity and stability of the fluorescent proteins.
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