Zeitschriftenartikel: „Jet Surface Interaction“

1

Schweigert, I., S. Vagapov, L. Lin und M. Keidar. „Plasma Jet Interaction with Dielectric Surface“. Journal of Physics: Conference Series 1112 (November 2018): 012004. http://dx.doi.org/10.1088/1742-6596/1112/1/012004.

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2

Algwari, Qais Th, und Deborah O'Connell. „Plasma Jet Interaction With a Dielectric Surface“. IEEE Transactions on Plasma Science 39, Nr. 11 (November 2011): 2368–69. http://dx.doi.org/10.1109/tps.2011.2160658.

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3

Rodko, Andrew, und Joseph C. Cataldo. „Interaction of Surface Waves and a Jet“. International Journal of Fluid Mechanics Research 26, Nr. 5-6 (1999): 660–78. http://dx.doi.org/10.1615/interjfluidmechres.v26.i5-6.90.

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4

Chin, David A. „Model of Buoyant‐JET‐Surface‐Wave Interaction“. Journal of Waterway, Port, Coastal, and Ocean Engineering 114, Nr. 3 (Mai 1988): 331–45. http://dx.doi.org/10.1061/(asce)0733-950x(1988)114:3(331).

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5

Walker, D. T., C. Y. Chen und W. W. Willmarth. „Turbulent structure in free-surface jet flows“. Journal of Fluid Mechanics 291 (25.05.1995): 223–61. http://dx.doi.org/10.1017/s0022112095002680.

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Results of an experimental study of the interaction of a turbulent jet with a free surface when the jet issues parallel to the free surface are presented. Three different jets, with different exit velocities and jet-exit diameters, all located two jet-exit diameters below the free surface were studied. At this depth the jet flow, in each case, is fully turbulent before significant interaction with the free surface occurs. The effects of the Froude number (Fr) and the Reynolds number (Re) were investigated by varying the jet-exit velocity and jet-exit diameter. Froude-number effects were identified by increasing the Froude number from Fr = 1 to 8 at Re = 12700. Reynolds-number effects were identified by increasing the Reynolds number from Re = 12700 to 102000 at Fr = 1. Qualitative features of the subsurface flow and free-surface disturbances were examined using flow visualization. Measurements of all six Reynolds stresses and the three mean velocity components were obtained in two planes 16 and 32 jet diameters downstream using a three-component laser velocimeter. For all the jets, the interaction of vorticity tangential to the surface with its ‘image’ above the surface contributes to an outward flow near the free surface. This interaction is also shown to be directly related to the observed decrease in the surface-normal velocity fluctuations and the corresponding increase in the tangential velocity fluctuations near the free surface. At high Froude number, the larger surface disturbances diminish the interaction of the tangential vorticity with its image, resulting in a smaller outward flow and less energy transfer from the surface-normal to tangential velocity fluctuations near the surface. Energy is transferred instead to free-surface disturbances (waves) with the result that the turbulence kinetic energy is 20% lower and the Reynolds stresses are reduced. At high Reynolds number, the rate of evolution of the interaction of the jet with the free surface was reduced as shown by comparison of the rate of change with distance downstream of the local Reynolds and Froude numbers. In addition, the decay of tangential vorticity near the surface is slower than for low Reynolds number so that vortex filaments have time to undergo multiple reconnections to the free surface before they eventually decay.

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6

Luo, Shi-Jie, Yao-Feng Liu und Yu-Wei Liu. „Visualization of asymmetric separation induced by lateral jet interaction on a slender body in supersonic flow“. International Journal of Modern Physics B 34, Nr. 14n16 (20.04.2020): 2040081. http://dx.doi.org/10.1142/s0217979220400810.

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The lateral jet interaction on a slender body in supersonic flow was investigated by numerical simulation. The spatial and surface flow characteristics induced by jet interaction were shown. As a result, when the lateral jet is not in the longitudinal symmetry plane, the jet interaction causes asymmetric separation flow of surface and space, and destroys the pressure distributions of the slender body. With different angle of attack and circumferential positions of jet, the flow characteristic of the after body for jet in asymmetry plane changes greatly. The results with and without jet interaction also show that the far-field interaction played a major role in the lateral jet interaction.

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7

Madnia, C. K., und L. P. Bernal. „Interaction of a turbulent round jet with the free surface“. Journal of Fluid Mechanics 261 (25.02.1994): 305–32. http://dx.doi.org/10.1017/s0022112094000352.

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The interaction of a turbulent round jet with the free surface was investigated experimentally. Flow visualization, free-surface curvature measurements and hot-film velocity measurements were used to study this flow. It is shown that surface waves are generated by the large-scale vortical structures in the jet flow as they interact with the free surface. These waves propagate at an angle with respect to the flow direction which increases as the Froude number is increased. Propagation of the waves in the flow direction is suppressed by the surface current produced by the jet. Farther downstream the surface motions are caused by the large-scale vortical structures. Characteristic dark circular features are observed in shadowgraph images associated with concentrated vorticity normal to the free surface. The normal vorticity is believed to be the result of vortex line reconnection processes in the turbulent flow. Measurements of the mean velocity and turbulence intensity are reported. Owing to the confinement by the free surface, the decay rate of the maximum mean velocity is reduced by a factor of √2 compared to an unconfined jet.

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8

Luo, Shi Jie, Yao Feng Liu und Ning Cao. „Numerical Simulation of Lateral Jet Interaction a Slender Body in Supersonic Flow“. Applied Mechanics and Materials 404 (September 2013): 296–301. http://dx.doi.org/10.4028/www.scientific.net/amm.404.296.

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A numerical investigation has been conducted to research the interaction flowfield of lateral jet not in the longitudinal symmetry plane on a slender body with rudders in supersonic flow. The surface and space flow features of jet interaction flowfield with different angles of attack was analyzed. The paper also compared with and without jet interaction flowfield characteristics. As a result, the jet interaction destroys pressure distributions of the slender body, and causes normal and lateral loads. With angle of attack, the pressure distributions of the after body and rudders surfaces are change tempestuously. The results also show that the far-field interference played a major role in the lateral jet interaction. Besides, the force/moment amplification factors present highly nonlinear with angle of attack.

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9

Zhang, Fei Hu, Xiao Zong Song, Yong Zhang und Dian Rong Luan. „Polishing of Ultra Smooth Surface with Nanoparticle Colloid Jet“. Key Engineering Materials 404 (Januar 2009): 143–48. http://dx.doi.org/10.4028/www.scientific.net/kem.404.143.

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A nanoparticle colloid jet machining system has been developed for polishing ultra smooth surface of brittle materials. Interaction between nanoparticles and work surface in nanoparticle colloid jet machining has been given, and the theoretical dependence of the material removal rate with various important process parameters of the nanoparticle colloid jet machining have been investigated through material removal experiments. Some material removal results of nanoparticle colloid jet machining show that it is possible to obtain removal rates of one nanometer level per minute for glass surfaces with appropriate machining process parameters. A K9 glass surface was polished for obtaining ultra smooth surface. The surface roughness value of atomic force microscopy (AFM) observations is under 1nm Rms.

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10

Luo, Shi Jie. „Asymmetrical Lateral Jet Interaction on a Slender Body in Supersonic Flow“. Applied Mechanics and Materials 565 (Juni 2014): 107–12. http://dx.doi.org/10.4028/www.scientific.net/amm.565.107.

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The lateral jet interaction on a slender body with rudders in supersonic flow had been investigated by numerical simulation, when the lateral jet is not in the longitudinal symmetry plane. It was called Asymmetrical lateral jet interaction in this paper. The flow features of jet interaction flowfield on the surface of the body or in the space far from the surface at different angles of attack and total pressure of jet was analyzed. As a result, the lateral jet interaction disturbed the pressure distributions of the slender body, and it was divided into near-field interaction near jet and far-field interaction aft-body on the basis of distance to jet. With the variety of the angle of attack and total pressure of jet, the pressure distributions at the aft-body change tempestuously, thereby the normal and lateral load will be from positive to negative, or reverse. The results also showed that the far-field interaction played a major role in the lateral jet interaction on a slender body in supersonic flow. The far-field interaction was caused by the changing of the outflow direction and intensity. Besides, the force/moment amplification factors presented highly nonlinear with the variety of angle of attack and total pressure of jet.

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11

Pan, Y., und B. W. Webb. „Heat Transfer Characteristics of Arrays of Free-Surface Liquid Jets“. Journal of Heat Transfer 117, Nr. 4 (01.11.1995): 878–83. http://dx.doi.org/10.1115/1.2836305.

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In this study, local heat transfer data under arrays of free-surface liquid jets are measured with a two-dimensional infrared radiometer. Experimental measurements were made for three nozzle diameters using a seven-jet staggered and a nine-jet inline geometric array configuration. Nozzle-to-plate spacings of two and five nozzle diameters were investigated for four jet center-to-center spacings ranging from two to eight diameters in the jet Reynolds number range of 5000 to 20,000. Results show that the stagnation Nusselt number under the central jet is independent of array configuration and jet-to-jet spacing. The different inter jet flow interaction, as represented by different jet array configurations (the in-line array and the staggered array with different nozzle-to-nozzle spacings), shows negligible influence on local heat transfer under the central jet. Differences in the heat transfer characteristics for the two nozzle-to-plate spacings investigated were the result of an observed transition from confined submerged central jet flow to free-surface jet flow as the nozzle-to-plate spacing was increased. Secondary maxima in the Nusselt number were observed between the adjacent jets, being a direct consequence of the radial flow interaction between jets. A correlation for average heat transfer is presented.

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12

MADARAME, Haruki. „Self-induced Oscillations Caused by Free Surface-Jet Interaction“. Proceedings of the JSME annual meeting 2002.3 (2002): 239–42. http://dx.doi.org/10.1299/jsmemecjo.2002.3.0_239.

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13

WALKER, DAVID T. „On the origin of the ‘surface current’ in turbulent free-surface flows“. Journal of Fluid Mechanics 339 (25.05.1997): 275–85. http://dx.doi.org/10.1017/s0022112097005181.

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In this study, the interaction with a free surface of an initially axisymmetric jet issuing beneath and parallel to the surface was examined. The purpose was to determine the origin of the ‘surface current’ – the large outward velocity which exists in a thin layer adjacent to the surface. Using the equations of mean motion, it is shown that near the surface, outward acceleration results from the balance between a positive contribution from the lateral Reynolds-stress gradients and a negative contribution from the lateral pressure gradient. The local pressure field near the free surface is shown to be largely determined by the local Reynolds-stress field. Combining these results shows that the lateral acceleration which results in the surface current is related to the Reynolds-stress anisotropy near the surface. The results indicate that there should be roughly a three-fold increase in the lateral growth rate of the jet near the free surface and a similar increase in the outward velocity, when compared to a deep jet. Comparison to available experimental data showed that the maximum outward velocity was consistent with the theory, and that the lateral scale of the surface-current layer was roughly double that of the deep jet, slightly smaller than expected. The near-surface stress anisotropy was shown to be related to the interaction of vorticity with the free surface. This indicates that the results of this study are consistent with earlier explanations of the surface current in terms of vortex/free-surface interaction.

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14

KATE, R. P., P. K. DAS und SUMAN CHAKRABORTY. „Hydraulic jumps due to oblique impingement of circular liquid jets on a flat horizontal surface“. Journal of Fluid Mechanics 573 (Februar 2007): 247–63. http://dx.doi.org/10.1017/s0022112006003818.

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An obliquely inclined circular water jet, impinging on a flat horizontal surface, confers a series of hydraulic jump profiles, pertaining to different jet inclinations and jet velocities. These jump profiles are non-circular, and can be broadly grouped into two categories, based on the angle of jet inclination, φ, made with horizontal. Jumps corrosponding to the range (25° < φ≤ 90°) are observed to be bounded by smooth curves, whereas those corresponding to φ≤ 25° are characterized by distinct corners. The present work attempts to find a geometric and hydrodynamic characterization of the spatial patterns formed as a consequence of such non-circular hydraulic jump profiles. Flow-visualization experiments are conducted to depict the shape of demarcating boundaries between supercritical and subcritical flows, and the corresponding radial jump locations are obtained. Theoretical calculations are also executed to obtain the radial locations of the jumps with geometrically smooth profiles. Comparisons are subsequently made between the theoretical predictions and the experimental observations, and a good agreement between these two can be observed. Jumps with corners, however, turn out to be comprised of strikingly contrasting profiles, which can be attributed to the ‘jump–jet’ interaction and the ‘jump-jump’ interaction mechanisms. A phenomenological explanation is also provided, by drawing an analogy from the theory of shock-wave interactions.

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15

Brodersen, S., D. E. Metzger und H. J. S. Fernando. „Flows Generated by the Impingement of a Jet on a Rotating Surface: Part I—Basic Flow Patterns“. Journal of Fluids Engineering 118, Nr. 1 (01.03.1996): 61–67. http://dx.doi.org/10.1115/1.2817514.

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The results of an experimental study of the flow field resulting from the interaction between an impinging jet and a rotating disk are presented. The resulting flow configuration has applications in turbomachinery, for example, to intensify the local heat transfer at turbine disks. The experiments cover separate measurements of the disk-wall flow, the jet flow and interaction between the two. The flow patterns are investigated over a range of jet Reynolds numbers Rejet = 0.66-104 - 6.80-104 (based on jet diameter) and disk Reynolds numbers Redisk 3.4·105 − 6.2· 105 (based on impingement radius), achieved by varying the jet nozzle diameter, jet flow rate, rotational disk speed and the impingement radius. The measurements included the depth of jet penetration into the wall boundary layer, the travel distance of the jet against the direction of disk rotation, and the turbulent and mean velocity distribution. Another objective of this study concerns the type of flow at the impingement region (jet dominated flow or rotation dominated flow) and the conditions for the transition from one to the other. In the first part of the study, the flow structure of the jet and disk flows as well as the three-dimensional flow fields resulting from the interaction are presented.

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16

Min, Wei, Hong Ji und Linfeng Yang. „Axial vibration in a poppet valve based on fluid–structure interaction“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, Nr. 17 (14.11.2014): 3266–73. http://dx.doi.org/10.1177/0954406214559999.

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In this paper, fluid–structure interaction modeling of poppet fluid was presented, response of poppet under the action of step and periodic excitation signal was simulated, and dynamic characteristics of viscous force and hydraulic force on poppet surface were analyzed. The investigation indicates that poppet surface before valve port can be divided into jet impingement area and static pressure area under the action of submerged jet, and the dynamic characteristics of hydraulic force on these areas and axial vibration of poppet are closely related with length of jet impingement and poppet structure. Furthermore, for hydraulic force on jet impingement area, hydraulic force on static pressure area, and viscous force, if amplitude and phase have a reasonable configuration, axial vibration amplitude of poppet can decrease greatly.

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17

TANAKA, Gentaro, und Koji OKAMOTO. „Visualization study on interaction between polymer jet and free surface“. Journal of the Visualization Society of Japan 19, Supplement1 (1999): 359–60. http://dx.doi.org/10.3154/jvs.19.supplement1_359.

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18

Mordasov, D. M., M. M. Mordasov, A. V. Firsova und M. D. Mordasov. „Interaction of Acoustically Modulated Gas Jet with Homogeneous Plane Surface“. Vestnik Tambovskogo gosudarstvennogo tehnicheskogo universiteta 23, Nr. 1 (2017): 180–87. http://dx.doi.org/10.17277/vestnik.2017.01.pp.180-187.

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19

Dawson, M. F., J. L. T. Lawrence, R. H. Self und M. J. Kingan. „Validation of a Jet–Surface Interaction Noise Model in Flight“. AIAA Journal 58, Nr. 3 (März 2020): 1130–39. http://dx.doi.org/10.2514/1.j058639.

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20

Pribytkov, I. A., und S. I. Kondrashenko. „Convective Heat Transfer in Jet Interaction with a Boundary Surface“. Steel in Translation 49, Nr. 3 (März 2019): 152–56. http://dx.doi.org/10.3103/s0967091219030100.

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21

Byun, Y. H., K. J. Bae, S. Wallis, V. Viti, J. A. Schetz und R. Bowersox. „Jet Interaction in Supersonic Flow with a Downstream Surface Ramp“. Journal of Spacecraft and Rockets 42, Nr. 1 (Januar 2005): 38–44. http://dx.doi.org/10.2514/1.4021.

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22

Romero, Leonel, Luc Lenain und W. Kendall Melville. „Observations of Surface Wave–Current Interaction“. Journal of Physical Oceanography 47, Nr. 3 (März 2017): 615–32. http://dx.doi.org/10.1175/jpo-d-16-0108.1.

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AbstractWave–current interaction can result in significant inhomogeneities of the ocean surface wave field, including modulation of the spectrum, wave breaking rates, and wave statistics. This study presents novel airborne observations from two experiments: 1) the High-Resolution Air–Sea Interaction (HiRes) experiment, with measurements across an upwelling jet off the coast of Northern California, and 2) an experiment in the Gulf of Mexico with measurements of waves interacting with the Loop Current and associated eddies. The significant wave height and slope varies by up to 30% because of these interactions at both sites, whereas whitecap coverage varies by more than an order of magnitude. Whitecap coverage is well correlated with spectral moments, negatively correlated with the directional spreading, and positively correlated with the saturation. Surface wave statistics measured in the Gulf of Mexico, including wave crest heights and lengths of crests per unit surface area, show good agreement with second-order nonlinear approximations, except over a focal area. Similarly, distributions of wave heights are generally bounded by the generalized Boccotti distribution, except at focal regions where the wave height distribution reaches the Rayleigh distribution with a maximum wave height of 2.55 times the significant wave height, which is much larger than the standard classification for extreme waves. However, theoretical distributions of spatial statistics that account for second-order nonlinearities approximately bound the observed statistics of extreme wave elevations. The results are discussed in the context of improved models of breaking and related air–sea fluxes.

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23

Shiryaeva, S. „Asymptotic Analysis of Nonlinear Resonance Interaction of Capillary Waves of Arbitrary Symmetry on Moving Charged Jet at Multimode Initial Deformation“. Elektronnaya Obrabotka Materialov 57, Nr. 3 (Juni 2021): 72–82. http://dx.doi.org/10.52577/eom.2021.57.3.72.

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The problem of research of a nonlinear resonance between capillary waves on a surface of the charged jet at multimode initial deformation moving regarding the material environment is considered. It is shown in analytical asymptotic calculations of the second order on the dimensionless amplitude of oscillations that on a surface of a jet an internal nonlinear resonant interaction of capillary waves of any symmetry, both degenerate and secondary combinational, takes place. Positions of resonances depend on physical parameters of the system: the values of the coefficient of a surface tension and of the radial electric field at a surface of a jet, the velocity of its movement regarding the material environment, the values of the wave and azimuthal numbers of the interacting waves, a range of the waves defining initial deformation.

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24

Terekhov, Viktor, und Yuriy Mshvidobadze. „Features of heat transfer at interaction of an impact swirl jet with a dimple“. Thermal Science 20, suppl. 1 (2016): 35–45. http://dx.doi.org/10.2298/tsci150819137t.

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Experimental results on investigation of heat transfer at interaction of an air impact jet with a semi-spherical cavity are presented in this work. This research is continuation of investigations of turbulent jet interaction with complex surfaces and search for the method of heat transfer control. Experiments were carried out with fixed geometry of a semi-spherical cavity (DC = 46 mm) and swirl parameter (R = 0; 0.58; 1.0; 2.74). The distance between the axisymmetric nozzle and obstacle was 2?10 sizes over the nozzle diameter, and the Reynolds number varied within Re0= (1?6)?104. It was found out that with an increase in swirling heat transfer intensity decreases because of fast mixing of the jet with ambient medium. In general, the pattern of swirl jet interaction with a concave surface is complex and multifactor.

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25

Li, Long-Fei, Jiang-Feng Wang, Fa-Ming Zhao und Yu-Han Wang. „Numerical study of interaction between jet with rudders on slender body at hypersonic condition“. Modern Physics Letters B 32, Nr. 12n13 (10.05.2018): 1840019. http://dx.doi.org/10.1142/s0217984918400195.

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In this paper, a numerical study of the interaction between transverse cold jets on slender body in front of or between X-shape rudders with rudders in the oncoming free stream is presented. Firstly, the flow field at different jet conditions is simulated and analyzed. Then, the total force and moment amplification factors of the corresponding slender body with jet at different locations are analyzed and compared with those results of non-jet flow. Numerical results show that interactions take a great effect to the configuration of the flow field around rudders and the pressure distribution on slender surface. Moreover, the force and moment amplification changes regularly along with the location of jet nozzle.

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26

Brodersen, S., D. E. Metzger und H. J. S. Fernando. „Flows Generated by the Impingement of a Jet on a Rotating Surface: Part II—Detailed Flow Structure and Analysis“. Journal of Fluids Engineering 118, Nr. 1 (01.03.1996): 68–73. http://dx.doi.org/10.1115/1.2817516.

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In Part I of this investigation, the basic flow patterns resulting from the interaction of a turbulent jet and a rotating disk flow were presented paying particular attention to mean and turbulent velocity fields around the jet impingement point on the disk and the flow patterns above the disk in the absence of the jet. The latter was used as a base flow pattern, on which the influence of the jet impingement could be assessed. In Part II, further details of the jet/disk flow interaction problem are discussed in the context of potential turbomachinery cooling applications and previous experimental results.

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Moallemi, M. K., und M. N. Naraghi. „An Experimental and Analytical Investigation of Ice Formation From a Circular Water Jet Impinging on a Horizontal Cold Surface“. Journal of Heat Transfer 116, Nr. 4 (01.11.1994): 1016–27. http://dx.doi.org/10.1115/1.2911437.

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The transient freezing of water impinging vertically on a subzero disk through a circular jet is studied experimentally to determine the interaction of the fluid flow and the solidification process. Experiments are performed over a range of the jet Reynolds number (1600 < Rei < 3500) based on the average velocity and radius of the falling jet at the impingement point. For this range of Reynolds numbers, that corresponds to tube Reynolds numbers less than 1100, and in the absence of solidification, the thin liquid film is characterized by a smooth circular hydraulic jump whose diameter is measured and correlated with the jet Reynolds number. The solidification process is initiated away from the jet (i.e., outside of the hydraulic jump) and moves inward toward the jet. The formation and growth of ice on the cold surface affect the flow field over the surface. This effect manifests itself in the form of a rapid reduction of the hydraulic jump diameter accompanied by instability in its position until its complete disappearance. The effect of fluid flow on the solidification process is found to be a small reduction in the nucleation temperature. The ice layer profiles at different times for different values of jet Reynolds number, and Stefan numbers of the surface and jet are also measured and reported. An approximate model is developed for the calculation of the transient crust growth by neglecting the interaction between the flow and solidification. The predicted solid crust profiles are compared with the measured ones, and the extent of the flow-freezing interactions is discussed. The approximate model is also used for a parametric study of the problem for a constant temperature surface.

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Song, Xiaozong, Shundong Ge, Xiaorong Wang und Shengkai Liu. „Experimental Investigation on the Effects of Photocatalysis in Ultraviolet-Induced Nanoparticle Colloid Jet Machining“. Materials 14, Nr. 5 (25.02.2021): 1070. http://dx.doi.org/10.3390/ma14051070.

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In this paper, ultraviolet (UV)-induced nanoparticle colloid jet machining is proposed to achieve ultrasmooth surface polishing by using the interaction between nanoparticles and the workpiece surface under the action of the ultraviolet field and the hydrodynamic pressure field. In the process of UV-induced nanoparticle colloid jet machining, the effects of photocatalysis on the interaction between nanoparticles and the workpiece surface need to be further studied in order to better understand the polishing process. This paper presents the interaction between TiO2 nanoparticles and a Si workpiece surface with and without ultraviolet irradiation. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) were applied to investigate the differences in the interaction of TiO2 nanoparticles with Si workpieces. The SEM and XPS results indicate that the photocatalysis of UV light can promote the interaction between TiO2 nanoparticles and a Si surface by creating more interfacial reaction active centers between the TiO2 nanoparticles and the Si workpiece. The FT-IR and XPS spectra show that TiO2 nanoparticles are chemically bonded to the Si workpiece by oxygen-bridging atoms in Ti-O-Si bonds. Due to the effects of photocatalysis, UV-induced nanoparticle colloid jet machining has a higher polishing efficiency than nanoparticle colloid jet machining with the same polishing parameters.

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OLEJNICZAK, JOSEPH, MICHAEL J. WRIGHT und GRAHAM V. CANDLER. „Numerical study of inviscid shock interactions on double-wedge geometries“. Journal of Fluid Mechanics 352 (10.12.1997): 1–25. http://dx.doi.org/10.1017/s0022112097007131.

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Computational fluid dynamics has been used to study inviscid shock interactions on double-wedge geometries with the purpose of understanding the fundamental gas dynamics of these interactions. The parameter space of the interactions has been explored and the different types of interactions that occur have been identified. Although the interactions are produced by a different geometry, all but one of them may be identified as an Edney Type I, IV, V, or VI interaction. The previously unidentified interaction occurs because of the geometrical constraints imposed by the double wedge. The physical mechanisms for transition have been studied, and the transition criteria have been identified. An important result is that there are two different regimes of the parameter space in which the state of the flow downstream of the interaction point is fundamentally different. At high Mach numbers this flow is characterized by an underexpanded jet which impinges on the wedge and produces large-amplitude surface pressure variations. At low Mach numbers, the jet becomes a shear layer which no longer impinges on the wedge surface.

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30

Xu, Peng, Agus Sasmito und Arun Mujumdar. „A computational study of heat transfer under twin turbulent slot jets impinging on planar smooth and rough surfaces“. Thermal Science 20, suppl. 1 (2016): 47–57. http://dx.doi.org/10.2298/tsci151130016x.

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The flow and heat transfer characteristics of twin turbulent slot jets impinging on planar smooth and rough surfaces are examined using a computational fluid dynamics model. The interaction between jets lowers the heat transfer performance of each jet in the zone where the wall jets collide. A single jet performs better than the equivalent twin jet. The average heat transfer under twin jets which are injected alternately so that each one of the pair of jets behaves like a single jet, is found to be better than twin jets issuing simultaneously. It is proposed that alternating jet flows in the twin jet arrangement is a simple novel way to enhance thermal performance of jet pairs. Along with parametric studies of the key flow and geometric parameters, effects of large temperature differences between the jet air and the target surface being heated, and model roughness of the target surface are also evaluated. Interestingly, roughness can lower the heat transfer performance in the impingement zone as the fluid can get trapped in the valleys in the rough surface.

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Escobar-Palafox, Gustavo A., Rosemary S. Gault und Keith Ridgway. „The Effect of Abrasive Water Jet Process Variables on Surface and Subsurface Condition of Inconel 718“. Advanced Materials Research 565 (September 2012): 351–56. http://dx.doi.org/10.4028/www.scientific.net/amr.565.351.

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Experiments were carried out in Inconel 718 in order to investigate the effect of abrasive water-jet process variables on surface and subsurface condition. A Design of Experiments (DoE) approach was taken, considering variables such as water pressure, traverse rate, abrasive mass flow rate and abrasive grit size. The experimental variables were related to taper ratio, surface roughness of different zones in the machined surface and subsurface condition (deformation and crater depth). Statistical analysis was carried out in order to develop mathematical models which include process variable interactions and quadratic terms. This led to models with high correlation and prediction power which allow a better understanding of the process and can form the base for further process optimisation. The models were validated with additional experiments and showed good agreement with the water jet system. The results showed that water pressure has a nonlinear behaviour in the quality of the surface and sub-surfaces and that interaction between the variables had a significant effect on the quality of the surfaces and sub-surfaces generated by the AWJ.

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Pribytkov, I. A., und S. I. Kondrashenko. „ON THE CALCULATION OF CONVECTIVE HEAT TRANSFER UNDER MUTUAL-ACTION OF A JET WITH LIMITING SURFACE“. Izvestiya. Ferrous Metallurgy 62, Nr. 3 (20.06.2019): 208–14. http://dx.doi.org/10.17073/0368-0797-2019-3-208-214.

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The paper proposes a method for calculating convective heat transfer in the interaction of a single circular jet with a flat surface. The differences of the proposed method from the existing ones are given. The concepts “energodynamic potential of the flow” and “energodynamic power of the flow” are introduced, allowing to determine the intensity of convective heat transfer at “gas-solid” boundary. Differences of the proposed definitions from the existing ones are given: heat flux and heat flux density. The principal difference between the heat flux density q and the energy dynamic potential qэ is as follows: the heat flux density q for convective heat transfer problems means the amount of heat that is transferred from a liquid to a solid surface (or vice versa) per unit of time through a unit of heat exchange surface area. Thus, quantity q characterizes the intensity of convective heat transfer process at the interface. The energy dynamic potential qэ characterizes the flow property as a source or carrier of heat. Value of qэ characterizes the specific energy power of the fluid flow. When calculating the heat transfer, it was proposed to divide the jet when interacting with the flat surface into two parts: before the interaction – the jet part, after – the fan flow. The method for calculating convective heat transfer under jet heating, in which the Reynolds criterion calculated by characteristics of the gas at the nozzle exit is decisive, is not entirely correct. It is proposed to use criteria specific to the fan flow. Characteristic values for the fan flow are its initial average velocity Uвп, distance from the critical point of the jet (point of intersection of vertical axis of the jet with the surface) to the current coordinate of radius downstream. To assess the changes in basic characteristics of a free jet at different distances from the nozzle exit to limiting surface, dependences of the following criteria are presented: jet expansion coefficient; jet injection coefficient; velocity coefficient for any jet section; velocity coefficient for any jet section, except h/d0 = 0; relation of the Reynolds criteria, confirming the need to carry out calculations of heat transfer on the values characteristic separately for the fan flow.

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Halynskyi, V. P. „Calculation of the interaction of a supersonic jet with a flat obstacle inclined off the jet axis“. Technical mechanics 2020, Nr. 4 (10.12.2020): 72–81. http://dx.doi.org/10.15407/itm2020.04.072.

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This paper presents results of a numerical solution of the model problem of the interaction of a plane supersonic jet with a semiinfinite flat plate inclinable off the jet axis. The paper is devoted to the study of the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination. The aim of the paper is to obtain the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination angle and front edge position. To obtain numerical results, marching algorithms in the inviscid gas and viscous layer approximation were used. At specified values of the supersonic underexpanded/overexpanded jet parameters, calculations were conducted in the plate inclination angle range of 0 to 20?. The position of the plate front edge was specified by two coordinates: a longitudinal and a transversal one, and in the parametric calculations the transversal coordinate was varied at a fixed longitudinal one. The cross-section at which the nonuniform jet field starts to interact with the plate was determined as a function of both the plate front edge position and the plate inclination. The numerical study showed the following: with increasing plate inclination angle, the oscillation frequencies of the flow parameters in the jet flow field and on the plate surface decrease, while their oscillation amplitudes increase, and the position of the maximum pressure point on the plate surface depends on the initial position of the plate front edge and may not coincide with the cross-section at which the jet–plate interaction starts. The results obtained may be used in qualitative estimation of the effect of different parameters in the jet flow field.

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Chen, Zhao-Quan, Dong Hu, Ming-Hai Liu, Guang-Qing Xia, Xiao-Liang Zheng, Ye-Lin Hu, Qiu-Bo Ye, Ming-Gong Chen, Long-Ji Zhu und Xi-Wei Hu. „Electromagnetic interaction between local surface plasmon polaritons and an atmospheric surface wave plasma jet“. Chinese Physics B 23, Nr. 3 (März 2014): 035202. http://dx.doi.org/10.1088/1674-1056/23/3/035202.

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35

Nishiwaki, Junto, Yuya Sawa, Yohei Harada und Shinji Kumai. „SPH Analysis on Formation Manner of Wavy Joint Interface in Impact Welded Al/Cu Dissimilar Metal Plates“. Materials Science Forum 794-796 (Juni 2014): 383–88. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.383.

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The impact welding was performed for several kinds of metal plate couples. The joint interface exhibited a sinusoidal wave form when two metal plates with the same or similar density (e.g.Al/Al, Cu/Cu and Cu/Ni) were impact-welded by high-speed oblique collision. In contrast, as for dissimilar metal plate couples with large density difference such as Al/Cu, an asymmetric wavy interface was obtained. In order to make clear the reason for morphological difference, a computer simulation of the collision behavior was performed using SPH (Smooth Particle Hydrostatic) method. The simulation results revealed that the wave form was controlled by the interaction between the emitted metal jet and metal plate surfaces ahead of the collision point. For Al/Al and Cu/Ni, the emitted metal jet hit each surface alternatively and this resulted in symmetrical wavy interface formation. While, for Al/Cu, the metal jet was emitted to the direction parallel to the Cu plate, and the interaction took place between the metal jet and the Cu plate surface. The metal jet emission and wavy interface formation mechanism were also investigated.

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Khavaran, Abbas. „Jet Surface Interaction – Scrubbing Noise in a Transversely Sheared Mean Flow“. International Journal of Aeroacoustics 14, Nr. 3-4 (August 2015): 373–412. http://dx.doi.org/10.1260/1475-472x.14.3-4.373.

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37

WADA, Takashi, Yutaka ABE, Akiko KANEKO, Yuta UCHIYAMA, Hideki NARIAI, Makoto YAMAGISHI, Kazuya KOYAMA und Kazuhiro ITOH. „21003 Interaction between molten material jet and coolant with surface solidification“. Proceedings of Conference of Kanto Branch 2010.16 (2010): 335–36. http://dx.doi.org/10.1299/jsmekanto.2010.16.335.

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38

Lim, C. K., P. A. Molian, R. C. Brown und J. M. Prusa. „Numerical Studies of Gas Jet/Molten Layer Interaction During Laser Cutting“. Journal of Manufacturing Science and Engineering 120, Nr. 3 (01.08.1998): 496–503. http://dx.doi.org/10.1115/1.2830152.

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The interaction of the gas jet with the molten layer during reactive-gas assisted laser cutting is investigated. The Navier-Stokes equations in each region are solved with an implicit finite-difference algorithm. The erosion front is modeled as a free surface and its profile is determined from the interaction. Equilibrium oxidation reactions are assumed and the laser is operating in TEM00 mode. Results for laser cutting of 3.175 mm and 6.35 mm thick mild steel with an oxygen jet are presented to illustrate the details of the gas jet/molten layer interaction.

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Shi, Jian Hui, Jin Hua Zhao, Guo Yuan, Lian Yun Jiang, Kun Zhao und Guo Dong Wang. „Heat Transfer Characteristics from Single Group Slot Jet Impingement on the Strip Surface for the Hot Rolling Ultra-Fast Cooling“. Materials Science Forum 816 (April 2015): 775–80. http://dx.doi.org/10.4028/www.scientific.net/msf.816.775.

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As for the impinging jets of single group slot nozzles, the heat transfer of the top and bottom strip surface is uneven which is mainly caused by the various jet distances of the top and bottom nozzle to the strip surface and the effect of gravity. In this study, the convective heat transfer process of the top and bottom strip surface due to single group slot nozzles in the ultra-fast cooling (UFC) system was studied by the fluid-structure interaction finite element method. The distributions of the flow field and heat transfer for the top and bottom strip surfaces were obtained under the various parameters. The results showed that, the difference value of the average Nusselt numbe for the top and bottom strip surface was decreased with the increase of the jet velocity, but when the jet velocity was up to 5m/s it remained almost the same. The uniformity of the top and bottom surface was improved by the jet impingement height (h) for the h<45mm. It was found that for h=25mm, the heat transfers of the top and down surfaces were more evenly, and the different value of average Nusselt number for the decreased by about 12.6%-28% as the jet impingement height increased from 25mm to 45mm when the slot width was 5mm.

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Baldauf, S., M. Scheurlen, A. Schulz und S. Wittig. „Correlation of Film-Cooling Effectiveness From Thermographic Measurements at Enginelike Conditions“. Journal of Turbomachinery 124, Nr. 4 (01.10.2002): 686–98. http://dx.doi.org/10.1115/1.1504443.

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Adiabatic film-cooling effectiveness on a flat plate surface downstream of a row of cylindrical holes is investigated. Highly resolved two-dimensional surface data were measured by means of infrared thermography and carefully corrected for local conduction and radiation effects. These locally acquired data are laterally averaged to give the streamwise distributions of the effectiveness. An independent variation of the flow parameters blowing rate, density ratio, and turbulence intensity as well as the geometrical parameters streamwise ejection angle and hole spacing is examined. The influences of these parameters on the lateral effectiveness is discussed and interpreted with the help of surface distributions of effectiveness and heat transfer coefficients presented in earlier publications. Besides the known jet in cross-flow behavior of coolant ejected from discrete holes, these data demonstrate the effect of adjacent jet interaction and its impact on jet lift-off and adiabatic effectiveness. In utilizing this large matrix of measurements the effect of single parameters and their interactions are correlated. The important scaling parameters of the effectiveness are shaped out during the correlation process and are discussed. The resulting new correlation is designed to yield the quantitatively correct effectiveness as a result of the interplay of the jet in crossflow behavior and the adjacent jet interaction. It is built modularly to allow for future inclusion of additional parameters. The new correlation is valid without any exception within the full region of interest, reaching from the point of the ejection to far downstream, for all combinations of flow and geometry parameters.

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Bulovich, S. V., A. N. Bazhenov und R. L. Petrov. „Normal interaction between a supersonic axisymmetric jet and a surface containing a hole coaxial with the jet“. Technical Physics 54, Nr. 12 (Dezember 2009): 1814–16. http://dx.doi.org/10.1134/s1063784209120160.

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Baniya, Hom Bahadur, Rajesh Prakash Guragain, Gobinda Prasad Panta, Santosh Dhungana, Ganesh Kuwar Chhetri, Ujjwal Man Joshi, Bishnu Prasad Pandey und Deepak Prasad Subedi. „Experimental Studies on Physicochemical Parameters of Water Samples before and after Treatment with a Cold Atmospheric Plasma Jet and its Optical Characterization“. Journal of Chemistry 2021 (13.01.2021): 1–12. http://dx.doi.org/10.1155/2021/6638939.

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Cold plasma-liquid interaction becomes a growing interdisciplinary area of research involving plasma physics, fluid science, and chemistry. Plasma-liquid interaction has gained more interest over the last many years due to its potential applications in different fields. Cold atmospheric plasma jet is an emerging technology for surface drinking water treatment to improve quality and surface modification that is chemical-free and eco-friendly. Cold plasma treatment of water samples results in changes in turbidity, pH, and conductivity and in the formation of reactive oxygen and nitrogen species (RONS). As a result, plasma-activated water has a different chemical composition than water and can serve as an alternative technique for microbial disinfection. CAPJ has been generated by a high voltage 5 kV and a high frequency 19.56 kHz power supply. The discharge has been characterized by an optical method. To characterize the cold atmospheric pressure argon plasma jet, discharge plume temperature, and electron rotational and vibrational temperature have been determined. Cold atmospheric argon plasma jet produced at atmospheric condition contains high energetic electrons, ions, UV radiation, reactive oxygen, and nitrogen species named as cold plasma which has a wide range of applications in the biomedical industry, as well as in water treatment. Nowadays, researches have been carried out on ozonation through plasma jet interaction with surface drinking water. In this paper, we compare the change in physical and chemical parameters of surface water used for drinking purposes. The significant change in the physical parameters such as pH, turbidity, and electrical conductivity was studied. In addition, the significant changes in the concentration and absorbance of nitrate, ferrous, and chromium ions with respect to treatment time were studied. Our results showed that plasma jet interaction with surface drinking water samples can be useful for the improvement of water quality and an indicator for which reactive species play an important role in plasma sterilization.

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Al-Shabab, A. A. Sheikh, und P. G. Tucker. „RANS prediction of open jet aerofoil interaction and design metrics“. Aeronautical Journal 123, Nr. 1266 (24.07.2019): 1275–96. http://dx.doi.org/10.1017/aer.2019.55.

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ABSTRACTRANS models remain an attractive turbulence simulation method which could provide some open jet aerofoil interaction analysis at a fraction of the cost of a high-fidelity LES approach. The present work explores the potential and limitations of RANS in this context by simulating an open jet aerofoil noise experiment using the aerospace oriented Menter SST RANS model. This model’s tendency to transition at a critical Reynolds number lower than the experimental value was found to impact the boundary layer development. However, the introduction of a low-Re correction improved the prediction of surface pressure and skin friction, enabling the suction surface separation bubble to be captured. The free shear layer’s virtual origin characteristics exhibited sensitivity to the interaction with the aerofoil, which can be developed into a metric of the interaction. The main challenge for RANS was accounting for the rise in background disturbance level in the working section, which is caused by the high-turbulence intensity in the free shear layers.

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Bodnárová, Lenka, Rudolf Hela, Libor Sitek, Petr Hlaváček und Josef Foldyna. „Flow Erosion Resistance of Concrete - Interaction of High-Speed Water Jet and Concrete“. Solid State Phenomena 296 (August 2019): 215–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.296.215.

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In the paper, the resistance of concrete to the erosive effect of water from a water jet was monitored. The tests were performed on concrete without the addition of fibres and on concrete with the addition of polypropylene fibres and steel fibres. The water flow hit the concrete surface at an angle of 90°. The water flow rate was 1.1 l/min and the water pressure was 80 MPa. After blasting the concrete with water jet, no cracks in the concrete were observed and the intended rugged surface relief was created. Steel fibres remained firmly anchored into the cement matrix.

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Tsitouras, Christos D., und Latif M. Jiji. „Experimental study of surface pressure in three-dimensional turbulent jet/boundary interaction“. AIAA Journal 24, Nr. 7 (Juli 1986): 1201–3. http://dx.doi.org/10.2514/3.9417.

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Someya, Satoshi, Koji Okamoto und Haruki Madarame. „VISUALIZATION ON THE INTERACTION BETWEEN JET AND SURFACE IN THE SWELL FLAPPING“. Journal of Flow Visualization and Image Processing 4, Nr. 2 (1997): 107–18. http://dx.doi.org/10.1615/jflowvisimageproc.v4.i2.20.

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47

Dreitser, Guenrikh A., V. P. Firsov, I. V. Antyukhov und D. A. Morozov. „The Interaction of a Liquid Nitrogen Jet with a Surface in Boiling“. Heat Transfer Research 32, Nr. 1-3 (2001): 7. http://dx.doi.org/10.1615/heattransres.v32.i1-3.120.

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WADA, Takashi, Yutaka ABE, Akiko KANEKO, Yuta UCHIYAMA, Hideki NARIAI, Makoto YAMAGISHI, Kazuya KOYAMA und Kazuhiro ITOH. „B210 Influence of Surface Solidification on Molten Material Jet and Coolant Interaction“. Proceedings of the National Symposium on Power and Energy Systems 2010.15 (2010): 299–300. http://dx.doi.org/10.1299/jsmepes.2010.15.299.

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49

Reinaud, J. N., D. G. Dritschel und X. Carton. „Interaction between a surface quasi-geostrophic buoyancy anomaly jet and internal vortices“. Physics of Fluids 29, Nr. 8 (August 2017): 086603. http://dx.doi.org/10.1063/1.4999474.

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Tanaka, G., K. Okamoto und H. Madarame. „Experimental investigation on the interaction between polymer solution jet and free surface“. Experiments in Fluids 29, Nr. 2 (07.08.2000): 178–83. http://dx.doi.org/10.1007/s003489900076.

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