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  • Three-Dimensional Navier-Stokes Simulations of Turbine ...

    2014-6-16 · Three-Dimensional Navier-Stokes Simulations of Turbine Rotor-Stator Interaction; Part I - Methodology ... End-wall and tip-leakage effects and the geometry of the air-foils may contribute significantly to the three-dimensionality of the flow. Hence, an accurate simulation of the flow within ... Three-Dimensional Navier-Stokes Simulations of Turbine

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  • Three-dimensional flow simulation of transient power ...

    2013-5-23 · The transient power failure process of a prototype pump-turbine was studied numerically by three-dimensional (3-D) simulations. Fluid coupling and dynamic mesh (DM) method were used to calculate the rotational speed of the runner. Simulations were performed based on turbulence model. Specific transient characteristics, such as the flow rate, head, rotational speed, were analyzed. The ...

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  • Experimental and Numerical Study of Three

    2015-2-18 · Air was used as the test fluid, and the internal flows were measured at various locations and under various capacities. Flow calculations were made, for both the isolated impeller case and the complete stage case, using Denton viscous codes LOSS3D and MULTSTAGE14, by which the three-dimensional steady flow through multiple blade rows can be calculated using the inter-row mixing …

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  • Acoustic streaming in an ultrasonic air pump with

    2014-12-1 · A three-dimensional simulation of acoustic streaming in an ultrasonic air pump using the FDTD method has been carried out on an arrayed GPU in the TSUBAME 2.0 supercomputer. Because of the adoption of the low Reynolds number than actual and the approximation in thermal physics, the calculated result of the amplitude of the sound pressure and ...

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  • Three-Dimensional, Unsteady, Parallel Simulation of a ...

    A computational fluid dynamics (CFD) procedure has been developed to predict the three-dimensional unsteady flow through a multi-stage axial turbine including the effects of heat transfer. This procedure simultaneously solves the unsteady Reynold's-averaged Navier-Stokes equations for the flow along with the heat conduction equation for the solid.

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  • Study on an innovative three-dimensional wind

    An original analytical three-dimensional wind turbine wake model is presented. The expression of wake model is simple and its computational cost is low. The accuracy of wake model is validated by the wind tunnel measured data. The wake model has a good accuracy beyond the 5D downwind of distance. The predictions from the wake model are practical.

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  • Study on an innovative three-dimensional wind

    2018-9-15 · An original analytical three-dimensional wind turbine wake model is presented. The expression of wake model is simple and its computational cost is low. The accuracy of wake model is validated by the wind tunnel measured data. The wake model has a good accuracy beyond the 5D downwind of distance.

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  • Review of positive slopes on pump performance ...

    2019-9-1 · Kawamoto et al. conducted a systematic investigation on the performance of three pump-turbine models with different guide vane height and runner vane thickness. It was discovered that a 5% decrease in the corresponding discharges of the saddle peak and the BEP on the H ∼ Q curve could be achieved by increasing the runner vane thickness by 5%.

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  • Pumps, Turbines, and Pipe Networks, part 2

    2021-2-22 · Pump and Turbine Dimensional Analysis (11.5 Young) • Say we want to replace turbines on the Hoover Dam • Want to have a good design – Essentially impossible to build, test, and modify at full scale – Design and testing for reduced scale to determine performance characteristics • Can scale up to prototype for prediction of

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  • Three-Dimensional Calculation of Air-Water Two

    1993-12-1 · To predict the behavior of gas-liquid two-phase flows in a centrifugal pump impeller, a three-dimensional numerical method is proposed on the basis of a bubbly flow model. Under the assumption of homogeneous bubbly flow entraining fine bubbles, the equation of motion of the mixture is represented by that of liquid-phase and the liquid velocity ...

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  • Acoustic streaming in an ultrasonic air pump with

    Acoustic streaming in an ultrasonic air pump with three-dimensional finite-difference time-domain analysis and comparison to the measurement Ultrasonics. 2014 Dec;54(8):2119-25. doi: 10.1016/j.ultras.2014.06.015. Epub 2014 Jun 24. Authors Yuji Wada 1 ...

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  • Three-dimensional Navier-Stokes simulations of

    2012-5-23 · Three-dimensional Navier-Stokes simulations of turbine rotor-stator interaction. Part I - Methodology. Man Mohan Rai

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  • Three Dimensional Heat Transfer Analysis of High

    2010-2-16 · 'Three Dimensional Heat Transfer Analysis of High Pressure Turbine Blade.' Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea, and Air. Volume 3: Heat Transfer, Parts A and B. Orlando, Florida, USA. June 8–12, 2009. pp. 71-79. ASME.

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  • Flow visualization and the three-dimensional flow in

    2012-5-23 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703.264.7500

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  • I have it—You want it! Bien-Air ... - Dental Economics

    In order to study the internal flow characteristics of roto-jet pump, the standard turbulence model and SIMPLEC algorithm were used to calculate the three-dimensional turbulence flow field under design condition. The simulation results reveal the internal flow phenomena of roto-jet pump, which shows the pressure near the suction surface and the inlet edge of impeller is minimum, and the ...

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  • Numerical Simulation of the Three-Dimensional

    2009-10-26 · Overview of Gas Turbine Augmentor Design, operation And Combustion Oscillation Houshang B. Ebrahimi ... air that passes through the bypass duct is remixed with the core combustion products in the ... assistance of three-dimensional CFD analysis. A detailed description of F110-GE-132

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  • Overview of Gas Turbine Augmentor Design, operation

    Material And Methods. Rhinodipterus ulrichi, Ørvig Reference Ørvig 1961 (NRM P6609a) is from the latest Givetian/earliest Frasnian lagoonal Bergisch Gladbach area, Germany (Ørvig Reference Ørvig 1961, Jessen Reference Jessen 1973, Friedman and Coates Reference Friedman and Coates 2005).The specimen is a partially mechanically prepared three-dimensional specimen, which has suffered some ...

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  • The dipnoan buccal pump reconstructed in 3D and ...

    2010-12-22 · A three-dimensional (3D) non-reflecting boundary condition for linearized flow solvers is presented. The unsteady aerodynamic modes at the inlet and outlet (far-field) are numerically determined by solving an eigen problem for the semi-discretized flow equations on a two-dimensional mesh.

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  • Three-Dimensional Non-Reflecting Boundary

    2020-2-24 · The vertical axis wind turbine (VAWT) is deemed to be potential in offshore wind energy utilization. A design of the offshore vertical axis wind turbine with a deflector is proposed and studied in this paper. Two-dimensional computational fluid dynamics (CFD) simulation is employed to investigate the aerodynamic performance of wind turbine.

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  • Experimental and Numerical Study of Three

    2015-2-18 · Air was used as the test fluid, and the internal flows were measured at various locations and under various capacities. Flow calculations were made, for both the isolated impeller case and the complete stage case, using Denton viscous codes LOSS3D and MULTSTAGE14, by which the three-dimensional steady flow through multiple blade rows can be ...

    Get Price
  • Three-Dimensional Simulation of Air Entrainment in a

    The three-dimensional unsteady vortex flow in a sump pump is investigated by the computational fluid dynamics (CFD) method with the shear-stress transport (SST) k − ω model and the volume of fluid (VOF) multiphase model. The helicity density, involving both velocity and vortex, is especially used to discuss the mechanism of the process for air entrainment.

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  • Three-Dimensional Calculation of Air-Water Two

    1993-12-1 · To predict the behavior of gas-liquid two-phase flows in a centrifugal pump impeller, a three-dimensional numerical method is proposed on the basis of a bubbly flow model. Under the assumption of homogeneous bubbly flow entraining fine bubbles, the equation of motion of the mixture is represented by that of liquid-phase and the liquid velocity ...

    Get Price
  • Three-Dimensional Flow Analysis and Design

    2008-9-19 · An, B, Liu, J, & Jiang, H. 'Three-Dimensional Flow Analysis and Design Improvement of Leading-Edge Film-Cooling in an Inlet Guide Vane.' Proceedings of the ASME Turbo Expo 2006: Power for Land, Sea, and Air.

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  • Three-Dimensional, Unsteady, Parallel Simulation of a ...

    A computational fluid dynamics (CFD) procedure has been developed to predict the three-dimensional unsteady flow through a multi-stage axial turbine including the effects of heat transfer. This procedure simultaneously solves the unsteady Reynold's-averaged Navier-Stokes equations for the flow along with the heat conduction equation for the solid.

    Get Price
  • A three-dimensional numerical study of the Magnus wind ...

    A three-dimensional numerical study of the Magnus wind turbine with different blade shapes Xiaojing Sun,1,2 Yueqing Zhuang,1,2 Yang Cao,3 Diangui Huang,1,2,a) and Guoqing Wu3 1Shanghai Institute ...

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  • Three-Dimensional Effects on an Oscillating-Foil ...

    2012-6-22 · Three-dimensional hydrodynamic losses are assessed in this investigation for a foil oscillating sinusoidally in a combined heave and pitch motion with large amplitudes. Simulations are performed using a unsteady Reynolds-Averaged-Navier-Stokes (URANS) solver on an oscillating foil in a power-extraction mode; thus acting as a hydrokinetic ...

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  • Three-Dimensional Non-Reflecting Boundary

    2010-12-22 · A three-dimensional (3D) non-reflecting boundary condition for linearized flow solvers is presented. The unsteady aerodynamic modes at the inlet and outlet (far-field) are numerically determined by solving an eigen problem for the semi-discretized flow equations on a two-dimensional mesh.

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  • Multi-Dimensional Platform for Cooling Design of Air ...

    2013-7-9 · Progresses in conjugate heat transfer simulation method provide a new approach for turbine blade cooling design. The procedure of air-cooled blade design introduced in this paper consists of two levels, a schematic design using 1D flow network calculation method, and a detailed design based on CFX conjugate heat transfer simulation.

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  • Ultrathin Three-Dimensional Thermal Cloak

    2014-2-3 · We report the first experimental realization of a three-dimensional thermal cloak shielding an air bubble in a bulk metal without disturbing the external conductive thermal flux. The cloak is made of a thin layer of homogeneous and isotropic material with specially designed three-dimensional manufacturing. The cloak's thickness is 100 ext{ } ext{ }ensuremath{mu}mathrm{m} while the ...

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  • Numerical and Experimental Investigation of the Flow

    2009-8-3 · The flow pattern in the volute and impeller of a twin-entry turbine is analyzed using fully three-dimensional viscous program. The computational performance results are compared with the experimental results, and good agreement is found. The flow field at the outlet of the turbine is investigated using a five-hole pressure probe.

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  • Dental Compressors: Wide Range of Dental Air

    The air turbine in the airotor handpiece, chair valves, delivery units, scalers and the three-way syringe use this compressed air produced by the compressor. The air compressor must be purchased having various factors in mind since the compressed air has direct contact with the patient and any form of contamination is undesirable.

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  • A pilot study of bioaerosol reduction using an air ...

    2010-10-15 · The use of a dental turbine handpiece, three-in-one syringe or ultrasonic scaling instrument has been reported to increase bioaerosol levels dramatically. 5,9,10,11 The microbial component of ...

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  • L.A Turbine | Rethinking Turboexpanders

    L.A. Turbine, a design and manufacturing company creating application-specific, highly engineered turboexpanders used in hydrocarbon processing, geothermal power generation, and other power-recovery or refrigeration applications in industrial processes worldwide. Learn more here.

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  • Sonic and ultrasonic scalers in periodontal treatment:

    2007-1-23 · The sound level that exceeds this frequency is called ultrasonic sound. In dental units, equipment such as ultrasonic scalers, high-speed air turbine drills, high-volume evacuators, and amalgamators mostly produce high intensity noise that may be a potential hazard to the auditory system of the persons exposed to the ultrasound.

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  • MEMS-Scale Turbomachinery Based Vacuum

    2013-11-14 · The zero flow case was simulated in all cases as the pump down time for these machines is small due to the small volume being evacuated. Initial transient two-dimensional simulations are used to evaluate three boundary conditions, classical no-slip, specified-shear and slip-flow.

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  • Optimization of Three-Dimensional Angled Ribs With

    2008-11-24 · A numerical optimization procedure for the shape of three-dimensional channel with angled ribs mounted on one of the walls to enhance turbulent heat transfer is presented. The response surface based global optimization with Reynolds-averaged Navier-Stokes analysis of fluid flow and heat transfer is …

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  • Surgical lasers and hard dental tissue | British Dental ...

    2007-4-28 · Three-dimensional topographic scanning electron microscope and Raman spectroscopic analyses of the irradiation effect on teeth by Nd:YAG, Er:YAG, and CO2 lasers. J …

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  • Woodpecker Dental Products at Best Price Online ...

    Buy Woodpecker Dental Products. Woodpecker, the biggest ultrasonic scaler manufacturer, owns a maximal production and consumption of ultrasonic scaler in the world.The export volume of LED curing light is also in the leading position. In the past 26 years, Woodpecker has been focused on researching, developing, selling dental equipment.

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  • What is 3D printing? How does a 3D printer work?

    3D printing or additive manufacturing is a process of making three dimensional solid objects from a digital file. The creation of a 3D printed object is achieved using additive processes. In an additive process an object is created by laying down successive layers of material until the object is created. Each of these layers can be seen as a ...

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  • Computational Fluid Dynamics Modeling Three

    2013-12-15 · Air turbines are widely used to convert kinetic energy into power output in power engineering. The unsteady performance of air turbines with partial admission not only influences the aerodynamic performance and thermodynamic efficiency of turbine but also generates strong excitation force on blades to impair the turbine safely operating. Based on three-dimensional viscous …

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  • Reducing Shock Interactions in Transonic Turbine via

    2014-9-12 · Reducing Shock Interactions in Transonic Turbine via Three-Dimensional Aerodynamic Shaping. ... Also, thanks are due to Peter Koch and Michael Ooten of U.S. Air Force Research Laboratory for their aerodynamic design work on the baseline High-Impact Technologies Research Turbine geometry. Received 28 April 2013;

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  • A Numerical Study of an Impingement Array Inside a

    2010-12-22 · Leo´n De Paz, M, & Jubran, BA. 'A Numerical Study of an Impingement Array Inside a Three Dimensional Turbine Vane.' Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air.

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  • Three-Dimensional Fluid Topology Optimization and ...

    2021-1-11 · Pietropaoli, M, Gaymann, A, & Montomoli, F. 'Three-Dimensional Fluid Topology Optimization and Validation of a Heat Exchanger With Turbulent Flow.' Proceedings of the ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. Volume 7A: Heat Transfer. Virtual, Online. September 21–25, 2020. V07AT15A006. ASME.

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  • Woodpecker Dental Products at Best Price Online ...

    Buy Woodpecker Dental Products. Woodpecker, the biggest ultrasonic scaler manufacturer, owns a maximal production and consumption of ultrasonic scaler in the world.The export volume of LED curing light is also in the leading position. In the past 26 years, Woodpecker has been focused on researching, developing, selling dental equipment.

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  • Three-dimensional flow visualization in the wake of a ...

    2013-1-24 · Three-dimensional 3-component velocity measurements were made in the near wake region of a miniature 3-blade axial-flow turbine within a turbulent boundary layer. The model turbine was placed in an open channel flow and operated under subcritical conditions (Fr = 0.13). The spatial distribution of the basic flow statistics was obtained at various locations to render insights into the spatial ...

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  • MEMS-Scale Turbomachinery Based Vacuum

    2013-11-14 · The zero flow case was simulated in all cases as the pump down time for these machines is small due to the small volume being evacuated. Initial transient two-dimensional simulations are used to evaluate three boundary conditions, classical no-slip, specified-shear and slip-flow.

    Get Price
  • Surgical lasers and hard dental tissue | British Dental ...

    2020-9-1 · Molten salt assisted synthesis of three dimensional FeNx/N,S–C bifunctional catalyst for highly compressible, stretchable and rechargeable Zn-Air battery Carbon ( IF 9.594) Pub Date : 2020-09-01, DOI: 10.1016/j.carbon.2020.05.024

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