Mixing of a two-layer density-stratified fluid by two vortex rings successively launched toward the density interface

2021 ◽  
Author(s):  
Lile Cao ◽  
Kotaro Takamure ◽  
Tomohiro Degawa ◽  
Tomomi Uchiyama
Keyword(s):  
Stratified Fluid ◽  
Vortex Rings ◽  
Density Interface ◽  
Layer Density

Experimental Study of Mixing of Two-Layer Density-Stratified Fluid by a Vortex Ring

2019 ◽  
Author(s):  
Lile Cao ◽  
Ryo Ito ◽  
Tomohiro Degawa ◽  
Yu Matsuda ◽  
Kotaro Takamure ◽  
...  
Keyword(s):  
Vortex Ring ◽  
Lower Layer ◽  
Stratified Fluid ◽  
Nacl Solution ◽  
Density Jump ◽  
Density Interface ◽  
Layer Density ◽  
Visualization Experiment ◽  
Planar Laser ◽  
Lower Fluid

Abstract This study experimentally investigates the mixing of a two-layer density-stratified fluid of water (upper layer) and aqueous sodium chloride (NaCl) solution (lower layer) induced by the interaction between a vortex ring and the density interface. The vortex ring, which consists of water, is launched from an orifice in the upper layer toward the density interface, after which its motion, along with the behavior of the lower fluid, is visualized through a planar laser-induced fluorescence method. The Atwood number that expresses the nondimensional density jump across the density interface is set at 0.0055, and the Reynolds number Re of the vortex ring is varied from 2050 to 3070. The visualization experiment clarifies that the vortex ring penetrating the density interface is bounced while collapsing in the lower fluid. Furthermore, it elucidates that the bounced upper fluid entrains the lower fluid into the upper layer by inducing a second vortex ring consisting of the lower fluid. Thus, this study reveals the effect of Re on the mixing of the upper and lower fluid induced by the launched vortex ring.

Vortex Rings in a Stratified Fluid

1976 ◽  
Vol 41 (6) ◽  
pp. 2121-2125 ◽  
Author(s):  
Hiroyuki Honji ◽  
Masakazu Tatsuno
Keyword(s):  
Stratified Fluid ◽  
Vortex Rings

Simulation of Jet Issued Into Two-Layer Density-Stratified Fluid by Vortex in Cell Method Combined With Immersed Boundary Method

2015 ◽  
Author(s):  
Isao Aozasa ◽  
Tomomi Uchiyama
Keyword(s):  
Immersed Boundary Method ◽  
Water Solution ◽  
Simulation Method ◽  
Stratified Fluid ◽  
Immersed Boundary ◽  
Layer Density ◽  
Jet Behavior ◽  
Lower Fluid ◽  
Ib Method ◽  
Present Simulation

Jet flow issued into two-layer density-stratified fluid in a cylindrical tank is numerically simulated. Vortex in cell (VIC) method combined with an Immersed Boundary (IB) method, which is presented by the current authors, is applied to the simulation. The upper and lower fluids are water and a NaCl-water solution, respectively, and the lower fluid is issued vertically upward from a nozzle on the bottom of the tank. The Reynolds number Re defined by the jet velocity and the nozzle diameter ranges from 95 to 1188, and the mass concentration of the NaCl-water solution C0 is set at 0 and 0.02. The simulation highlights that the jet behavior relative to the density interface and the resultant mixing phenomena depend on Re. Such simulated results are confirmed to agree well with the experimentally visualized ones, demonstrating the validity of the present simulation method.

Propagation of vortex rings in stratified fluid

1982 ◽  
Vol 23 (2) ◽  
pp. 178-181
Author(s):  
V. I. Boyarintsev ◽  
A. I. Leont'ev ◽  
S. Ya. Sekerzh-Zen'kovich ◽  
V. I. Sysoev
Keyword(s):  
Stratified Fluid ◽  
Vortex Rings

scholarly journals Behavior of a Jet Issuing Diagonally Upward into Two-Layer Density-Stratified Fluid in a Cylindrical Tank

2017 ◽  
Vol 05 (03) ◽  
pp. 51-64
Author(s):  
Tomohiro Degawa ◽  
Shota Fukue ◽  
Tomomi Uchiyama ◽  
Akira Ishikawa ◽  
Koji Motoyama
Keyword(s):  
Stratified Fluid ◽  
Cylindrical Tank ◽  
Layer Density

A note on the slope of a density interface between two stably stratified fluids under wind

1977 ◽  
Vol 81 (2) ◽  
pp. 335-339 ◽  
Author(s):  
Jin Wu
Keyword(s):  
Wind Stress ◽  
Wind Wave ◽  
Stratified Fluid ◽  
Density Difference ◽  
Stratified Fluids ◽  
Wave Tank ◽  
Two Fluids ◽  
Density Interface

Experiments were conducted with two layers of stably stratified fluid in a wind-wave tank. The slope of the density interface was measured and was related to the wind stress, the density difference between the two fluids and the depth of the interface.

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