Dynamic structures of a submerged jet interacting with a free surface

Qian, Wen; Kim, Hyun Dong; Liu, Ying Zheng; Kim, Kyung Chun

doi:10.1016/j.expthermflusci.2014.06.005

Cited by 25 publications

(6 citation statements)

References 29 publications

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“…Thus, the pressure oscillation must be generated by the main region of turbulent jet. As reported by previous researchers [2,3,8,[22][23], several turbulent vortexes and found in the turbulent jet wake region and jet boundary. According to the turbulent jet and turbulent vortex theories, the jet vortexes can cause significant pressure fluctuation.…”

Section: Fig12 Angular Coefficient Versus Water Temperaturesupporting

confidence: 65%

“…For example, according to report of Hong et al [17], the generation of the first dominant frequency is a joint action of steam jet and the water flow in the jet wake region. In addition, previous studies [2,4,8,[22][23][24][25] indicated the instability of the turbulent jet boundary and the presence of many vortexes in the jet main region. The unstable jet boundary and the vortexes in the jet wake region will also cause pressure oscillation in the water tank.…”

Section: Introductionmentioning

confidence: 96%

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Characteristic of pressure oscillation caused by turbulent vortexes and affected region of pressure oscillation

Chen

Zhao

Wang

et al. 2016

Experimental Thermal and Fluid Science

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Submerged steam jet condensation is widely applied in various fields because of its high heat transfer efficiency. Condensation oscillation is a major character of submerged steam turbulent jet, and it significantly affects the design and safe operation of industrial equipment. This study is designed to reveal the mechanism of the low-frequency pressure oscillation of steam turbulent jet condensation and determine its affected region. First, pressure oscillation signals with low frequency are discovered in the downstream flow field through oscillation frequency spectrogram and power analysis. The oscillation frequency is even lower than the first dominant frequency. Moreover, the critical positions, where the low-frequency pressure oscillation signals appear, move downstream gradually with radial distance and water temperature. However, these signals are little affected by the steam mass flux. Then, the regions with low-frequency pressure oscillation occurring are identified experimentally. The affected width of the low-frequency pressure oscillation is similar to the turbulent jet width. Turbulent jet theory and the experiment results collectively indicate that the low-frequency pressure oscillation is generated by turbulent jet vortexes in the jet wake region. Finally, the angular coefficients of the low-frequency affected width are obtained under different water temperatures. Angular coefficients, ranging from 0.2268 to 0.2887, decrease with water temperature under test conditions.

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Section: Fig12 Angular Coefficient Versus Water Temperaturesupporting

confidence: 65%

Section: Introductionmentioning

confidence: 96%

Characteristic of pressure oscillation caused by turbulent vortexes and affected region of pressure oscillation

Chen

Zhao

Wang

et al. 2016

Experimental Thermal and Fluid Science

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“…Arslan et al [11] measured the flow field of the gap between two interacting ship-like sections, from which various flow phenomena, such as vortex formation, flow separation, and reattachment mechanism were observed. Wen et al [12] studied the flow structures of underwater jets with free surfaces using time-resolved PIV. Gim [13] conducted measurements of the circumferential flow field for a twin-rudder model in a circulating water channel under various angles of attack and separation distances using stereoscopic PIV (SPIV).…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran

Sun

Guo

Wang

et al. 2020

JMSE

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The interactions between the main hull and demi-hull of trimarans have been arousing increasing attention, and detailed circumferential flow fields greatly influence trimaran research. In this research, the unsteady wake flow field of a trimaran was obtained by Reynolds-Averaged Navier-Stokes (RANS) equations on the basis of the viscous flow principles with consideration of the heaving and pitching of the trimaran. Then, we designed an experimental method based on particle-image velocimetry (PIV) and obtained a detailed flow field between the main hull and demi-hull of the trimaran. A trimaran model with one demi-hull made of polycarbonate material with 90% light transmission rate and a refractive index 1.58 (close to that of water 1.33) was manufactured as the experiment sample. Using polycarbonate material, the laser-sheet light-source transmission and high-speed camera recording problems were effectively rectified. Moreover, a nonstandard calibration was added into the PIV flow field measurement system. Then, we established an inverse three-dimensional (3D) distortion coordinate system and obtained the corresponding coordinates by using optics calculations. Further, the PIV system spatial mapping was corrected, and the real flow field was obtained. The simulation results were highly consistent with the experimental data, which showed the methods established in this study provided a strong reference for obtaining the detailed flow field information between the main hull and demi-hull of trimarans.

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“…To overcome this lack of information, the evolution of positively buoyant jets was analyzed by: (1) non-intrusive techniques such as Particle Image Velocimetry (PIV) [16][17][18][19][20], (2) Laser Induce Fluorescence (LIF) [21][22][23][24][25], and/or (3) simultaneously PIV and LIF [26][27][28][29]. These two techniques provided high-quality results of velocity vector fields and concentration scalar fields at one or several planes of the fluid medium for any discharged substance, respectively.…”

Section: Introductionmentioning

confidence: 99%

Zonation of Positively Buoyant Jets Interacting with the Water-Free Surface Quantified by Physical and Numerical Modelling

García-Alba

Bárcena

Garcı́a

2020

Water

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The evolution of positively buoyant jets was studied with non-intrusive techniques—Particle Image Velocimetry (PIV) and Laser Induce Fluorescence (LIF)—by analyzing four physical tests in their four characteristic zones: momentum dominant zone (jet-like), momentum to buoyancy transition zone (jet to plume), buoyancy dominant zone (plume-like), and lateral dispersion dominant zone. Four configurations were tested modifying the momentum and the buoyancy of the effluent through variations of flow discharge and the thermal gradient with the receiving water body, respectively. The physical model results were used to evaluate the performance of numerical models to describe such flows. Furthermore, a new method to delimitate the four characteristic zones of positively buoyant jets interacting with the water-free surface was proposed using the angle (α) shaped by the tangent of the centerline trajectory and the longitudinal axis. Physical model results showed that the dispersion of mass (concentrations) was always greater than the dispersion of energy (velocity) during the evolution of positively buoyant jets. The semiempirical models (CORJET and VISJET) underestimated the trajectory and overestimated the dilution of positively buoyant jets close to the impact zone with the water-free surface. The computational fluid dynamics (CFD) model (Open Field Operation And Manipulation model (OpenFOAM)) is able to reproduce the behavior of positively buoyant jets for all the proposed zones according to the physical results.

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Dynamic structures of a submerged jet interacting with a free surface

Cited by 25 publications

References 29 publications

Characteristic of pressure oscillation caused by turbulent vortexes and affected region of pressure oscillation

Characteristic of pressure oscillation caused by turbulent vortexes and affected region of pressure oscillation

Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran

Zonation of Positively Buoyant Jets Interacting with the Water-Free Surface Quantified by Physical and Numerical Modelling

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