Periodic vortex shedding phenomenon for various separation distances between two plane turbulent parallel jets

Mondal, Tanmoy; Das, Manab Kumar; Guha, Ayan

doi:10.1016/j.ijheatmasstransfer.2016.03.095

Cited by 26 publications

(7 citation statements)

References 16 publications

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“…12(a), despite various Reynolds numbers, the streamwise distance of x mp varying with l/d d has a similar performance to that in the previous investigations. [24,38,39] A best fitting curve of present data is established as x mp /d d = 6.09 e 0.19(l/d d ) − 7.58. It is noteworthy that x mp /d d does not increase linearly as l/d d increases from 1.5 to 4, however, it reveals an exponential growth with small curvature.…”

Section: Flow Field and Turbulence Statisticsmentioning

confidence: 96%

“…[21] Faghani and Rogak [22] developed a semi-analytical model to predict the velocity field of the dual circular jets. Anderson et al [23] conducted an experiment to study the periodic vortex shedding phenomenon in a dual-jet flow, where the effect of separation distance on the vortex shedding was further investigated by Mondal et al [24] Greco et al [25] experimentally investigated the impinging single and dual circular jets to compare the time-averaged behavior of velocity components. In regard to the noise prediction, Kanyola [26] performed experiments on a heated dualjet to evaluate the effects of turbulent mixing and acoustic shielding on jet noise by varying the separation distances.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the interaction of the turbulent dual-jet and acoustic propagation

Li¹,

Li²,

Qi³

et al. 2017

Chinese Phys. B

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In order to study the interaction between two independent jets, a three-dimensional (3D) transient mathematical model is developed to investigate the flow field and acoustic properties of the two-stream jets. The results are compared with those of the single-stream jet at Mach number 0.9 and Reynolds number 3600. The large eddy simulation (LES) with dynamic Smagorinsky sub-grid scale (SGS) approach is used to simulate the turbulent jet flow structure. The acoustic field is evaluated by the Ffowcs Williams-Hawkings (FW-H) integral equation. Considering the compressibility of high-speed gas jets, the density-based explicit formulation is adopted to solve the governing equations. Meanwhile, the viscosity is approximated by using the Sutherland kinetic theory. The predicted flow characteristics as well as the acoustic properties show that they are in good agreement with the existing experimental and numerical results under the same flow conditions available in the literature. The results indicate that the merging phenomenon of the dual-jet is triggered by the deflection mechanism of the Coanda effect, which sequentially introduces additional complexity and instability of flow structure. One of the main factors affecting the dual-jet merging is the aperture ratio, which has a direct influence on the potential core and surrounding flow fluctuation. The analysis on the noise pollution reveals that the potential core plays a fundamental role in noise emission while the additional mixing noise makes less contribution than the single jet noise. The overall sound pressure level (OASPL) profiles have a directive property, suggesting an approximate 25 • deflection from the streamwise direction, however, shifting toward lateral direction of about 10 • to 15 • in the dual-jet. The conclusion obtained in this study can provide valuable data to guide the development of manufacturing-green technology in the multi-jet applications.

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Section: Flow Field and Turbulence Statisticsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the interaction of the turbulent dual-jet and acoustic propagation

Li¹,

Li²,

Qi³

et al. 2017

Chinese Phys. B

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“…Regarding the influence of the nozzle spacing ratio on the dual parallel jet characteristics, domestic and foreign researchers have found that the characteristics of dual parallel jet are related to the ratio of the nozzle axis spacing d to the nozzle width w (nozzle spacing ratio, d/w ). Wang and Tan [ 27 ] proved that the existence of Carmen vortex led to the periodic interaction between two jets when d/w = 1; Mondal, Das, Guha, and Transfer [ 28 ] concluded that at 0.6 ≤ d/w ≤ 1.4, the peak value of jet velocity decreases with an increase in the jets’ spacing ratio; Liu et al [ 11 ] studied the jet characteristics of rectangular nozzles, and found that the nozzle spacing ratio is linear with the merging point; Zhao and Wang [ 29 ] found that the whole flow field periodically declines at 7 ≤ d/w ≤ 8; and Manigandan et al [ 30 ] studied the aerodynamic mixing characteristics of the nozzle with an identical circular exit of the spacing ratio where d/w = 3, and found that the mixing promoting capability decreases as the area of the elliptical throat decreases.…”

Section: Introductionmentioning

confidence: 99%

Influence of Non-Structural Parameters on Dual Parallel Jet Characteristics of Porous Nozzles

Zhang

Yang

et al. 2020

Micromachines

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As an important actuator of the dual parallel jet, the porous nozzle has some non-structural parameters (such as inlet pressure, nozzle spacing ratio, etc.) which have a significant influence on energy transport, chemical combustion and pollutant generation. The research on the microfluidic state of the porous nozzle dual parallel jet, however, remains insufficient because of its microjet pattern and complex intersection process. In this paper, the authors used numerical simulation and an experimental method to clarify the influence of porous nozzles’ non-structural parameters on dual parallel jet characteristics. The results show that the inlet pressure only changes the pressure peak value on the parallel jet axis; the starting point (SP) and peak point (PP) on the parallel jet axis, which are located at Xsp = 22 mm and Xpp = 75 mm, respectively, are not changed; and with the increase in the nozzle spacing ratio, the merging points (MPs) on the parallel jet axis are Xmp = 25 mm, 32 mm and 59 mm, respectively. The merging point and the combined point move to a farther distance and the inner deflection angle of the jet is weakened.

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“…Aerospace engineering is the first field where aerodynamic and aeroelasticity disciplines are of great interest, given the need for guaranteeing the appropriate behavior of the vehicle under any circumstance and the convenience of elaborating designs that avoid aircraft instabilities or undesired responses. Thus, several studies on wind-induced phenomena such as flutter [3,4], torsional divergence [5,6], and vortex shedding [7,8] can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational studies on the performance of solar trackers under vortex shedding, torsional divergence, and flutter

Quintela¹,

Jurado²,

Rapela³

et al. 2020

Int. J. CMEM

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The current development of renewable energies has originated a number of new structural typologies that are the physical support of the energy production systems. Photovoltaic energy is a very mature source and it is obtained using rows of panels implemented in a longitudinal grillage. Many studies have been carried out in the past with an aim to improve the capacity to obtain electrical power, but another important issue is the need to guarantee the performance of these industrial facilities under the phenomena induced by the turbulent wind flow, taking into account the fact that they are usually built in wide open spaces. This paper describes an extensive research carried out on two configurations of solar trackers by experimental and computational methods. The former was composed of a number of tests of reduced models of segments of the solar trackers, which were carried out in an aerodynamic wind tunnel. The latter consisted of a series of structural analyses worked out through a finite element model of the full panel subjected to aerodynamic and aeroelastic loads. Several angles of attack of the wind flow and a wide range of wind speeds were included in the study. This approach allowed to clearly evaluate the structural and dynamic performance of both the configurations of solar trackers under the most important wind-induced phenomena such as vortex shedding, torsional divergence, and flutter. The paper relates the phases of the study and informs about the more relevant numerical results obtained in the experiments and the computer analysis.

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Periodic vortex shedding phenomenon for various separation distances between two plane turbulent parallel jets

Cited by 26 publications

References 16 publications

Numerical investigation of the interaction of the turbulent dual-jet and acoustic propagation

Numerical investigation of the interaction of the turbulent dual-jet and acoustic propagation

Influence of Non-Structural Parameters on Dual Parallel Jet Characteristics of Porous Nozzles

Experimental and computational studies on the performance of solar trackers under vortex shedding, torsional divergence, and flutter

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