Mixing in coaxial jets

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August undefined, 2024

Web11 apr. 2024 · In accordance with high-speed schlieren results, the flow instabilities in the subsonic–supersonic mixing layer with a convective Mach number of 0.19 are investigated in detail. ... “ Effect of convective Mach number on mixing of coaxial circular and rectangular jets,” Phys. Fluids A 3(1), 29 ... WebMixing of coaxial jets: Comparison of sodium and air experime.. INIS In some parts of Liquid Metal-cooled Reactors, notably the core exit area, hot and cold sodium jets are mixing. In the turbulent mixing region, temperature fluctuations occur and may cause surface cracking on the lower part of the above core structure. To prevent s

(PDF) MIXING IN TURBULENT COAXIAL JET - researchgate.net

WebCoaxial jets are present in several practical applications, especially in the field of combustion, where the problem of mixing is largely controlled by the flow dynamics. This has motivated many studies on isothermal coaxial jets, principally in the homogeneous case (Champagne and Wygnanski 1971, Kwan and Ko 1976, Au and Ko 1987, Dahm et … Web24 jun. 2024 · Numerical investigation of incompressible mixing in the coaxial jet has been already considered in widespread works. Ranga Dinesh et al. [ 14] studied numerically mixing and intermittency in a coaxial turbulent jet. They discussed the effect of vortex shedding on velocity fluctuation inside the inner mixing. la burundesa jaca pamplona

Mixing in coaxial jets - NASA/ADS

WebIn some parts of nuclear reactors components, hot and cold jets are mixing. In the turbulent mixing region, temperature fluctuations occur and may cause surface cracking on the structures. We study a configuration of coaxial vertical jets, the inner one is cold and the outer one is hot. WebMixing is contemplated according to its geometrical, statistical and spectral facets with particular attention paid to determining the relevant timescales of the evolution of, for … Web16 jul. 2024 · Increasing the pressure and the velocity ratio enhances turbulent mixing, promotes the entrainment of the outer stream into the inner region, and advances the pinching point of vortical motion to the centerline, thereby leading to a decreased length of the inner dark core. la burundesa bilbao

Development of High-pressure Injectors for Gas and Hydrogen

Flow dynamics of shear-coaxial cryogenic nitrogen jets under ...

Web1 jul. 1994 · @misc{etde_20089119, title = {Mixing of coaxial jets: Comparison of sodium and air experiments} author = {Tenchine, D, and Moro, J P} abstractNote = {In some parts of Liquid Metal-cooled Reactors, notably the core exit area, hot and cold sodium jets are mixing. In the turbulent mixing region, temperature fluctuations occur and may cause … WebAbstract. The stirring and mixing properties of one-phase coaxial jets, with large outer (annular) to inner velocity ratio ru = u2 / u1 are investigated. Mixing is contemplated according to its geometrical, statistical and spectral facets with particular attention paid to … la burundesa pamplonaWeb1 jul. 2024 · The mixing enhancement of a coaxial jet with a Mach 1.4 primary jet and sonic secondary jet, at different convective Mach numbers, is presented in this study. Rectangular tabs of aspect ratios ( AR = h / w , where h and w are the tab height and width, respectively) 2.0 and 0.75 were employed to manipulate the primary and secondary jets, … la burundesa pamplona irun

"Web25 dec. 2000 · The stirring and mixing properties of one-phase coaxial jets, with large outer (annular) to inner velocity ratio ru = u2/u1 are … " - Mixing in coaxial jets

Mixing in coaxial jets

Web17 dec. 2024 · In this paper, we present a numerical simulations of near and farfield structure of the Air-Air Mixing in Turbulent Compressible Coaxial Jets. The … WebMixing in coaxial jets 163 u 2 u 1 e y x Figure1.Sketch of the injector outlets and development of the ﬂow. Inner and outer jets have diameters D1 = 2cm and D2 =2:7cm, …

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Web24 jun. 2024 · The coaxial jet can be regarded as a model of injection device in industrial applications; one can cite combustion and aeroacoustics technology. Three-dimensional … Web22 aug. 2012 · Mixing and coherent vortices in turbulent coaxial jets Comptes Rendus Mécanique, Vol. 333, No. 8 Modeling of Two Dimensional Synthetic Jet Unsteadiness Using Neural Network-Based Deterministic Source Terms

Web1 sep. 1973 · The results show that coaxial jets tend to reach a self-preserving state much more rapidly than axisymmetric single jets; that the mean velocity, normal stresses, and … Web20 nov. 2024 · The first step in the mixing process is kinematic, involving large-scale vortical structures entraining ambient fluid into the jet as they undergo pairing. Turbulent, and finally, molecular diffusion then completes the mixing process at the smallest scales.

WebThe centre jet consisted of a mixture of helium and oxygen (95\% He and 5\% O$_2$ by volume, 70.4\% He and 29.6\% O$_2$ by mass), while the coflow jet surrounding the centre jet consisted of air. The presence of oxygen in the centre jet was to allow the use of an oxygen flow tagging technique (RELIEF) to obtain non-intrusive velocity measurements … Web1 sep. 1973 · The results show that coaxial jets tend to reach a self-preserving state much more rapidly than axisymmetric single jets; that the mean velocity, normal stresses, and Reynolds shear stress attain this state at a similar downstream location; and that, for the particular geometry investigated, a velocity ratio of around 0.15 corresponds to the …

Web24 mei 2024 · Coaxial Jets are considered an effective way to mix two different fluids. The coaxial jet configuration is widely used in industrial systems, e. g. in combustion …

Web15 jan. 2024 · Coaxial jets mixing enhancement is more complicated and has a wide range of applications. Especially in the aerospace field, mixing enhancement of combustion … jean-puetzWeb25 nov. 2009 · When the phase difference is greater than zero, mixing enhancement of coaxial jets can be achieved, but there are maximum phase difference and optimal phase difference. On the contrary, application of adjacent synthetic jets always leads to the mixing reduction when phase difference is less than zero. Download to read the full article text jean puetzWeb8 mei 2012 · Coaxial jets are commonly used to mix fluids due to the simplicity of their geometry and the rapid mixing that they provide. A measure of the overall mixing … labur work asian paintsWeb29 sep. 2016 · Mixing behavior of a coaxial jet is dominated by evolution of the outer shear layer, when the outer jet is faster than the inner one [7, 24].Therefore, 12 miniature jet actuators (D m = 1.0 mm) are arranged on the inner surface of the annular nozzle, and the periodic disturbances are introduced into the initial outer shear layer of the annular jet. labusainfoWeb23 mei 2012 · An analysis of fuel–oxidizer mixing and combustion induced by swirl coaxial jet injector with a model of gas–gas injection Aerospace Science and Technology, Vol. … jean puetz kinderWeb5 jan. 2009 · The results show that mixing process in confined jets depends strongly not only on the velocity ratio, but also on the interaction between the boundary layer, mixing … la burundangaWeb26 apr. 2024 · The mixing performance of the hydrogen/air coaxial jet in various jet diameters is investigated. • Effect of air jet pressure on mixing performance is fully investigated. • RANS equation are solved with SST turbulence model for the simulation of the supersonic cross flow. • Increasing coaxial jet diameter improves fuel penetration … labur usp