Optimum Design of a Saw-Tooth-Shaped Dental Air
Three types of dental air turbine designs with different turbine blades, nozzle angles, nozzle flow channels, and shroud clearances were tested and analyzed.
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Three types of dental air turbine designs with different turbine blades, nozzle angles, nozzle flow channels, and shroud clearances were tested and analyzed.
Get Price2013-5-23 · 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.
Get PriceDesigning high-speed dental air-turbine handpiece by using a computational approach October 2017 International Journal of Precision Engineering and Manufacturing 18(10):1403-1407
Get Price2020-1-22 · An air-turbine and associated air supply tube was optimized as a dental air-turbine handpiece system. The system consists of an air-turbine with an impeller and a housing, and an air supply tube which supplies compressed-air to the air-turbine. The flow characteristics of the dental air-turbine handpiece system were investigated using ANSYS CFX.
Get PriceThe measurement of performance characteristics of dental air turbine handpieces is of interest with respect to product comparisons, standards specifications and monitoring of bearing longevity in clinical service. Previously, however, bulky and expensive laboratory equipment was required. A portable …
Get Price2018-9-15 · 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.
Get Price2017-9-1 · Usually, high speed air-turbine dental handpieces operate at 200,000 to 400,000 revolutions per minute [5]. The main part of the dental air turbine is its high speed rotor head consisting of a casing with air inlet and outlet nozzles, impeller, spindle, chuck …
Get Price2009-11-20 · bottom- sides. The top thrust air bearing employs pump-in type spiral grooves, and the bottom bearing uses pump-out type grooves. The journal air bearing is a plain journal with a critical short journal length (L) and a small radial clearance (C). Aspect ratio (L:C) above 20:1 is realized using optimized DRIE process. The micro turbine device
Get Price2007-1-4 · Based on the actual turbine structure, a pump-in configuration with spiral grooves is designed for top thrust air bearing, and a pump-out configuration is selected for bottom thrust bearing, as shown in Fig. 4a–c. Due to the miniaturized dimension and small weight of the rotor, the gravity force is trivial and the axial load mainly comes from the pressure difference between the top and bottom thrust air bearings.
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Get Price2019-1-21 · Three-Dimensional Visualization of Flow Characteristics Using a Magnetic Resonance Imaging in a Lattice Cooling Channel ... Three-Dimensional Velocity Distribution Measurement of an Air Cooled Flow Passage for Gas Turbine Blades by Using Magnetic Resonance Imaging,” ... Geothermal Heat Pump and Heat Engine Systems: Theory and Practice.
Get Price2017-10-19 · Investigation on Flow Characteristics of Pump-Turbine Runners With Large Blade Lean Baoshan Zhu, Baoshan Zhu ... A Compressible Three-Dimensional Design Method for Radial and Mixed Flow Turbomachinery Blades,” ... Air-Water Ring in the Vaneless Gap of a Reversible Pump-Turbine Operating in Condenser Mode.
Get Price2007-1-4 · Based on the actual turbine structure, a pump-in configuration with spiral grooves is designed for top thrust air bearing, and a pump-out configuration is selected for bottom thrust bearing, as shown in Fig. 4a–c. Due to the miniaturized dimension and small weight of the rotor, the gravity force is trivial and the axial load mainly comes from ...
Get Price2014-9-9 · Turbine cascade correlation (Ainley) 81 Comparison of the profile loss in a cascade and in a turbine stage 86 Optimum space-chord ratio of turbine blades (Zweifel) 87 References 88 Problems 90 4. Axial-flow Turbines: Two-dimensional Theory 93 Introduction 93 Velocity diagrams of the axial turbine stage 93 Thermodynamics of the axial turbine ...
Get Price2014-12-24 · Hale, A, & O’Brien, W. 'A Three-Dimensional Turbine Engine Analysis Compressor Code (TEACC) for Steady-State Inlet Distortion.' Proceedings of the ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition.
Get Price2015-8-12 · The Three Dimensional Flow Structure and Turbulence in the Tip Region of an Axial Flow Compressor ... Turbine Technical Conference and Exposition. Volume 2A: Turbomachinery. Montreal, Quebec, Canada. ... Three-Dimensional Structure and Turbulence Within the Tip Leakage Vortex of an Axial Waterjet Pump.
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Get Price2016-8-31 · Compressed air powers many different kinds of devices. It can be used to push a piston, as in a jackhammer; it can go through a small air turbine to turn a shaft, as in a dental drill; or it can be expanded through a nozzle to produce a high-speed jet, as in a paint sprayer. Compressed air provides torque and rotation power for
Get Price2012-5-23 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703.264.7500
Get Price2008-9-3 · 12. 3 The Euler Turbine Equation The Euler turbine equation relates the power added to or removed from the flow, to characteristics of a rotating blade row. The equation is based on the concepts of conservation of angular momentum and conservation of energy. We will work with the model of the blade row shown in Figure 12.2.
Get Price2010-10-15 · The use of a dental turbine handpiece, three-in-one syringe or ultrasonic scaling ... The sampling pump was located 20 cm away from the dental ... Micik et al. 11 found that air-turbine hand ...
Get Price2014-12-15 · This paper will fill that gap by providing a complete ORC analysis including the thermodynamic cycle, the preliminary meanline design and finally pioneering three-dimensional CFD simulations of a 400 kW-R143a radial-inflow turbine in sensible geothermal brine and cycle conditions. Off-design conditions are also presented and discussed.
Get Price2017-10-19 · Investigation on Flow Characteristics of Pump-Turbine Runners With Large Blade Lean Baoshan Zhu, Baoshan Zhu ... A Compressible Three-Dimensional Design Method for Radial and Mixed Flow Turbomachinery Blades,” ... Air-Water Ring in the Vaneless Gap of a Reversible Pump-Turbine Operating in Condenser Mode.
Get Price2009-11-20 · Based on the actual turbine structure, a pump-in configuration with spiral grooves is designed for top thrust air bearing, and a pump-out configuration is for bottom bearing, as shown in Figs.4 (a)-(c). Due to the miniaturized dimension and small weight of thrust plate, the axial load is mainly caused by the pressure difference
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Get Price2009-2-4 · A conjugate numerical methodology was employed to predict the metal temperature of a three-dimensional gas turbine vane at two different engine-realistic operating conditions. The vane was cooled internally by air flowing through ten round, radially-oriented channels.
Get Price2021-6-18 · Based on the actual turbine structure, a pump-in configuration with spiral grooves is designed for top thrust air bearing, and a pump-out configuration is for bottom bearing, as shown in Figs.4 (a)-(c). Due to the miniaturized dimension and small weight of thrust plate, the axial load is mainly caused by the pressure difference
Get PricePackaging & Shipping pcp with valve gauge hose and 8mm wind powered air pump Package: 1. one unit of pcp hand air pump in one small carton. 3. Why the Air Rifle Pump leak It is not oil spills, silicone oil on the wall of the pcp hand pump, silicone oil is to protect the seal, while lubricating Portable Inflation PCP pump, inflate more easier. 4 ...
Get PriceTo help clarify when dipnoan air breathing appeared, we shall herein discuss those features in Rhinodipterus considered salient in the dipnoan air breathing buccal pump (Thomson Reference Thomson 1969, Campbell and Barwick Reference Campbell and Barwick 1988, Long Reference Long 1993, Long and Clement Reference Long and Clement 2009).
Get Price2009-10-26 · Arnold Air Force Base, TN 37389-9013 Abstract The augmentor on a modern aircraft gas turbine engine provides significant thrust augmentation which is critical to the performance and mission of tactical aircraft. This paper provides an overview of gas turbine augmentor
Get Price2020-2-4 · Cavitation is a complicated phenomenon in the centrifugal pump. In this work, the improved unsteady calculation model based on bubble-rotation-based Zwart–Gerber–Belamri (BRZGB) cavitation model is used to investigate the cavitation-vortex-pressure fluctuation interaction in a centrifugal pump under partial load with experimental validation.
Get PriceThree dimensional tidal turbine array simulations using ... 2018-1-16 · 1 1 Three dimensional tidal turbine array simulations using 2 OpenFOAM with dynamic mesh 3 Martin Nuernberg, *Longbin Tao 4 School of Marine Science and Technology, Newcastle University, Newcastle upon Tyne, 5 NE1 7RU, UK 6 Abstract 7 The flow field characteristics in the wake of an isolated tidal turbine and tidal ...
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Get Price2018-3-19 · Three dimensional finite element stress analysis of a cantilevered fixed partial enture. ... reason to use an electric handpiece over an air-turbine hand-piece, as the electric handpiece is significantly more efficient at ... between electric and air-turbine dental handpieces Charlson Choi, DDS, MS,a Carl F. Driscoll, DMD,b and Elaine
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Get PriceAir turbine handpieces, electro-micro motors and electric engines are widely used as the dental cutting instruments for the clinical use. So, this paper examined the measurement of rotational torque of the high speed dental instruments used for cutting works.
Get Price2012-8-17 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703.264.7500
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Get Price2014-5-22 · Example 12.2 Centrifugal Pump Performance Based on Inlet/Outlet Velocities zWater is pumped at the rate of 1400 gpm through a centrifugal pump operating at a speed of 1750 rpm. The impeller has a uniform blade length, b, of 2 in. with r 1 = 1.9 in. and r 2 = 7.0 in., and the exit blade angle is β=23º . Assume ideal flow conditions and that the
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