Performance enhancement of a vortex ring thruster by adopting the Coanda effect
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Marine Science and Technology"
DOI: 10.1007/s00773-024-01014-2
Abstract: A vortex ring thruster (VRT) is a propulsion device in which a piston pushes fluid and thrusts it in reaction. As the fluid inside a VRT is moving, the boundary layer near the wall at… read more here.
Keywords: propulsion performance; jet; coanda jet; performance ... See more keywords
Evolution of the Lagrangian drift and vortex added-mass of a growing vortex ring
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Hydrodynamics"
DOI: 10.1007/s42241-021-0064-2
Abstract: The vortex-based propulsive systems’ enhanced performance greatly contributes to the vortex added-mass effect, which was initially developed to explain the added drag when a solid body accelerates in fluids. However, the solution of the instantaneous… read more here.
Keywords: added mass; lagrangian drift; vortex ring; vortex added ... See more keywords
Preparation of shaped non-polyelectrolyte hydrogel particles with decomposable and recyclable performance by vortex ring freezing
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Industrial and Engineering Chemistry"
DOI: 10.1016/j.jiec.2021.07.039
Abstract: Abstract The vortex-ring derived particles are new type of non-spherical hydrogel particles, which are prepared by imitating the process of vortex-ring in nature. However, the traditional existing vorticity ring derived hydrogel particles were prepared by… read more here.
Keywords: hydrogel particles; non polyelectrolyte; preparation; vortex ring ... See more keywords
Vortex-ring-induced stratified mixing: mixing model
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2017.846
Abstract: The study of vortex-ring-induced mixing has been significant for understanding stratified turbulent mixing in the absence of a mean flow. Renewed interest in this topic has prompted the development of a one-dimensional model for the… read more here.
Keywords: vortex ring; mixing mixing; stratified mixing; ring induced ... See more keywords
Formation regimes of vortex rings in thermals
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2019.1036
Abstract: The development of laminar thermals and the formation of buoyant vortex rings in thermals are studied by performing direct numerical simulations. The formation number of buoyant vortex rings in thermals is also analysed. We find… read more here.
Keywords: vortex ring; vortex; formation; number ... See more keywords
Evolution of elliptic synthetic jets at low Reynolds number
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2019.162
Abstract: The influence of the nozzle aspect ratio ( $AR=1$ , 2 and 4), stroke length ( $L_{0}=1.85$ , 3.7 and 5.55) and Reynolds number ( $Re=79$ , 158, 316 and 632) on the behaviour of… read more here.
Keywords: vortex ring; synthetic jets; reynolds number; elliptic synthetic ... See more keywords
Collisions of vortex rings with hemispheres
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2024.13
Abstract: Abstract A numerical investigation was conducted on $Re_{\varGamma _{0}}=3000$ vortex rings colliding with wall-mounted hemispheres to study how their relative sizes affect the resulting vortex dynamics and structures. The hemisphere to vortex ring diameter ratio… read more here.
Keywords: vortex rings; tertiary vortex; boundary layer; vortex ring ... See more keywords
Interactions between a toroidal bubble and a free surface
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2024.892
Abstract: Abstract Toroidal bubbles (TBs) represent cases of vortex rings with a gas–liquid interface where a gas vortex ring is encased within a liquid vortex ring, and can serve as effective media for mass conveyance, process… read more here.
Keywords: toroidal bubble; bubble free; free surface; interactions toroidal ... See more keywords
Gravity Wave Breaking and Vortex Ring Formation Observed by PMC Turbo
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Geophysical Research"
DOI: 10.1029/2020jd033038
Abstract: Polar mesospheric cloud (PMC) imaging and lidar profiling performed aboard the 5.9 day PMC Turbo balloon flight from Sweden to northern Canada in July 2018 revealed a wide variety of gravity wave (... read more here.
Keywords: vortex ring; gravity wave; wave breaking; pmc turbo ... See more keywords
Spectrum study on unsteadiness of shock wave–vortex ring interaction
Sign Up to like & getrecommendations! Published in 2018 at "Physics of Fluids"
DOI: 10.1063/1.5027299
Abstract: Shock oscillation with low-frequency unsteadiness commonly occurs in supersonic flows and is a top priority for the control of flow separation caused by shock wave and boundary layer interaction. In this paper, the interaction of… read more here.
Keywords: vortex ring; frequency; interaction; low frequency ... See more keywords
Turbulence cascade model for viscous vortex ring-tube reconnection
Sign Up to like & getrecommendations! Published in 2021 at "Physics of Fluids"
DOI: 10.1063/5.0040952
Abstract: The reconnection of a vortex ring and a vortex tube in a viscous fluid with the effects of two vortex core sizes ( σ 0 = 0.12 r 0 and 0.24 r 0, where r0… read more here.
Keywords: vortex ring; right offset; ring tube; tube ... See more keywords