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  • Influence of Nozzle Geometry on the Noise of High-Speed ...

    2012-5-17 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703.264.7500

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  • The Influence of Atomizer Geometry on Effervescent

    2017-3-15 · the influence of geometric parameters on the quality of atomization. Geometric parameters investigated include exit orifice diameter, nozzle length-to-diameter ratio, mixing chamber diameter, mixing length and air injection geometry. Comparisons are made with previous studies performed using earlier versions of the hardware or al-

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  • A Numerical Study of the Influence of Diesel Nozzle ...

    2002-3-4 · A Numerical Study of the Influence of Diesel Nozzle Geometry on the Inner Cavitating Flow. 2002-01-0215. In order to analyze the influence of nozzle geometry on the internal flow characteristics of a Diesel injector, a CFD analysis of the flow through various nozzle geometries has been carried out with a commercial code.

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  • Effects of fuel injection angle on mixing performance of ...

    2020-11-10 · Effects of fuel injection angle on mixing performance of scramjet pylon-cavity flameholder Physics of Fluids 32, 116108 ... “ Experimental investigation of influence factors on flame holding in a supersonic combustor,” Aerosp. Sci. ... “ Effects of pylon geometry on mixing enhancement in a scramjet pylon-cavity flameholder,” Aeronaut. J.

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  • The Influence of Tip Geometry and Distance on Light

    2008-1-1 · Therefore, for lower distances between the light guide and the restorative material, the tip with a higher R-value is more efficient. Between 4 mm and 5 mm of distance, there is a change in efficacy between the two tips, and the tip with R=1.18 generates a higher depth of cure (4.52 ± 0.02 mm) than the tip with R=1.63 (4.44 ± 0.03 mm).

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  • Influence of the vessel shape on the performance of a ...

    2018-10-1 · The shape of the tank plays an important role in the hydrodynamic performance of the agitation. A 3D simulation was done using CFD calculation code (CFX16.0). The study was carried out for large Reynolds number: 104–2.105. Navier–Stokes equations governing the phenomenon are solved by a method of discretization finite volume. The turbulence model used is the k–ε standard type. Our …

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  • Effects of the Re-Entrant Bowl Geometry on a DI ...

    2010-8-30 · The bowl geometry and dimensions, such as the pip region, bowl lip area, and toroidal radius, are all known to have an effect on the in-cylinder mixing and combustion processes. Based on the idea of enhancing diffusion combustion at the later stage of the combustion period, three different bowl geometries, namely, bowl 1 (baseline), bowl 2, and ...

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  • The influence of cellulose nanocrystal additions on the ...

    2015-2-1 · The influence of cellulose nanocrystals (CNCs) addition on the performance of cement paste was investigated. Our mechanical tests show an increase in the flexural strength of approximately 30% with only 0.2% volume of CNCs with respect to cement. Isothermal calorimetry (IC) and thermogravimetric analysis (TGA) show that the degree of hydration ...

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  • Influence of Humidity on the Electrostatic Charge and ...

    2007-3-22 · Abstract To investigate the influence of storage relative humidity (RH) on the aerosolisation efficiency and tribo-electrification of carrier based dry powder inhaler (DPI) formulations using the next generation impactor (NGI) in vitro methodology and the electrostatic low pressure impactor (ELPI). Micronised salbutamol (d 0.5 1.48 ± 0.03 μm) was blended with 63–90 μm sieve fractioned α ...

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  • Effect of Nanotube Geometry on the Strength and

    Abstract. This study investigated the effect of multiwalled carbon nanotubes’ geometry on the dispersion and strength of cement composites. Mixes with CNTs contents ranging from 0.03 to 0.25% were prepared and tested using CNTs’ diameters of 10–20, 20–30, and 30–50 nm and lengths of 0.5–2 and 10–30 μm.The samples’ microstructures were then examined using a scanning electron ...

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  • Influence of dispersion states on the performance of ...

    2014-9-12 · Influence of dispersion states on the performance of polymer-based nanocomposites. ... Sample geometry was such that a parallel plate capacitor configuration is used; the electrodes were evaporated silver, 1 cm in diameter and 100 nm in thickness. ... The result of this study specifically revealed that nanoscale dispersion could influence ...

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  • Effects of Steel Fibers Geometry on the Mechanical ...

    Effects of Steel Fibers Geometry on the Mechanical Properties of SIFCON Concrete This research aims to shed light on the effect of steel fiber shape, length, diameter, and aspect ratio on the mechanical properties of slurry infiltration fiber reinforced concrete (SIFCON).

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  • The turbulent mixing layer: geometry of large vortices ...

    The turbulent mixing layer: geometry of large vortices. Department of Aerospace Engineering, University of Southern California, Los Angeles, CA 90089-0192 Permanent address: Department of Mechanical Engineering, Washington State University, Pullman, WA 99164-2920.

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  • Effect of Rotation and Revolution on Performance of Blade ...

    In this study, flow structures and mixing performance in a blade-free planetary mixer, which combines rotation and revolution motions inside a cylindrical vessel, are numerically investigated. Flow fields in the mixer vessel are simulated in a single rotating reference frame with various revolution speeds and a fixed rotation speed. The mixing process is investigated by a Lagrangian particle ...

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  • 'Effect of electrode geometry on high energy spark ...

    The government, aerospace, and transportation industries are deeply invested in developing new technologies to improve the performance and maneuverability of current and future aircraft while reducing aerodynamic noise and environmental impact. One of the key pathways to meet these goals is through aerodynamic flow control, which can involve suppressing or inducing separation, transition and ...

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  • Influence of Steel Fibres and Matrix Composition on The ...

    2016-8-3 · Influence of steel fibres and matrix composition on the properties of UHPFRC Kim Huy Hoang, Philipp Hadl, Nguyen Viet Tue 5 4. Results Table 2: The critical volumes of StF1 and StF2 and the equivalent fibre factors for the four UHPC matrices. Fibre UHPC_1mm UHPC_2.5mm UHPC_4mm UHPC_8mm

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  • Uncertainty quantification of the effects of squealer tip ...

    2020-1-13 · These geometry deviations would change the flow field near the blade tip, which will influence the thermal and aerodynamic performance. Thus, it is important to quantitatively investigate the effects of squealer tip geometry deviation on the aerothermal performance.

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  • Selective aerobic oxidation of para-xylene in sub- and ...

    In this paper we report a strong dependence of the observed performance of the catalyst on the geometry and the configuration of laboratory scale reactors in the continuous aerobic oxidation of p-xylene in supercritical water.Small differences, such as the length of the feed pipes …

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  • Why Structural Fiber is the Smart Choice for Thin Concrete ...

    2021-8-23 · Therefore, consideration of fiber geometry and stiffness when choosing fibers for concrete overlays often becomes an economic choice, where the designer must balance cost, workability, and performance. Regarding the influence of the material on the residual strength, steel fibers often outperformed synthetic fibers by a significant margin.

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  • Influence of Humidity on the Electrostatic Charge and ...

    2007-3-22 · Abstract To investigate the influence of storage relative humidity (RH) on the aerosolisation efficiency and tribo-electrification of carrier based dry powder inhaler (DPI) formulations using the next generation impactor (NGI) in vitro methodology and the electrostatic low pressure impactor (ELPI). Micronised salbutamol (d 0.5 1.48 ± 0.03 μm) was blended with 63–90 μm sieve fractioned α ...

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  • Evaluation of cyclone geometry and its influence on ...

    Evaluation of cyclone geometry and its influence on performance parameters by computational fluid dynamics (CFD) W. P ... Smagorinsky model can be thought of as combining the Reynolds averaging assumptions given by L ij + C ij = 0 with a mixing length-based …

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  • The Limits Of Compression Ratio

    2013-3-25 · Understanding the Influence of Screw Geometry on Melting Rate ... and mixing, without affecting either the feed rate or the melting performance. The use of “standard” C/Rs for certain polymers has resulted in many poorly designed screws. The shortcoming is usually in matching the melting rate to the polymer and output.

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  • Time and Length Scales of Mixing: The Macro Scale ...

    2021-8-1 · The Double Planetary Mixer (photo) is suitable for high-precision mixing, granulation and vacuum drying all in a single vessel. Powders… A high-performance mixing and pumping skid system This company recently designed a new skid system (photo) capable of mixing and pumping low to moderately viscous products. The…

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  • Influence of anisotropic permeability on convection in ...

    2016-5-2 · Solute convection in porous media at high Rayleigh-Darcy numbers has important fundamental features and may also bear implications for geological CO 2 sequestration processes. With the aid of direct numerical simulations, we examine the role of anisotropic permeability on the distribution of solutal concentration in fluid saturated porous medium. Our computational analyses span over few ...

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  • Mixing Enhancement in Simple Geometry Microchannels ...

    2008-5-12 · While mixing is good in all six cases, we demonstrate that the best results occur when both inlets are pulsed 90 degrees out of phase in the “T” geometry. In all six cases, the interface is shown to stretch, retain two folds, and sweep through the confluence zone, leading to good mixing within 2 mm downstream of the confluence, i.e. about 1 ...

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  • Concrete Mixing Methods and Concrete Mixers: State of

    2001-4-1 · 2.1.2 Pan Mixers . All pan mixers work on basically the same principle []: a cylindrical pan (fixed or rotating) contains the concrete to be mixed, while one or two sets of blades rotate inside the pan to mix the materials and a blade scrapes the wall of the pan.The shapes of the blades and the axes of rotation vary. Figure 4 shows the different combinations of blade configurations and pan.

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  • Effect of centerline distance on mixing of a Non

    2018-12-26 · Distributive mixing was examined through the flow patterns and spatial positions of the tracked particles. The centerline distance was the key factor for controlling the gap between the rotors that influence mixing and energy consumption. Different mixing subzones alternated in sequence.

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  • A mathematical model reveals the influence of population ...

    2020-8-14 · In response to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), some politicians have been keen to exploit the idea of achieving herd immunity. Countering this possibility are estimates derived from work on historical vaccination studies, which suggest that herd immunity may only be achieved at an unacceptable cost of lives. Because human populations are far from homogeneous ...

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  • On the front velocity of gravity currents

    Following their sudden release, the gravity currents are observed to go through an acceleration phase in which the maximum front velocity is reached. As the interface of the current rolls up, the front velocity slightly decreases from the maximum and levels off to a nearly constant value.

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