vortex rings
Thermal Performance Analysis of A Circular Tube Using Vortex Rings at Various Angle and Pitch Ratio
... inclined vortex rings (VR) on heat transfer augmentation in a uniform heat-fluxed tube has been investigated ...thevortex rings were mounted repeatedly in the tube with various angle (25 0 ,30 0 ,35 ...
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Towards high capacity molecular communications using sequential vortex rings
... 1) Simulation: The simulations are conducted using in- dustrial standard COMSOL software with the Computational Fluid Dynamics (CFD) and Chemical Species Transport mod- ules coupled. The simulation parameters are given ...
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A New Technique for the Calculation of Colliding Vortex Rings
... the vortex ring. At (a) t*=15, the two rings collide and begin to ...two rings merge into one. At (c) t* = 45 the vortex rings reconnect and form two new ...the vortex ...
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Traversing SPIV for the measurement of vortex rings under background rotation
... the vortex rings in the horizontal x − y ...the vortex-ring ...the rings, it is evidently required to perform detailed PIV measurements, computational studies and a theoretical stability ...
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Interactions between normal-fluid and superfluid vortex rings in helium-4
... normal-fluid vortex rings on superfluid ones is an energy transfer that blows-up the latter to the size of the ...superfluid vortex bundles studied in [18] must be put in the system “by experimental ...
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The effect of strong electric fields on exotic negative ions in He II : possible evidence for the nucleation of charged vortex rings
... charged vortex rings. The large normal ion/vortex signal moves to the right with increasing E to reveal a number of small maxima corresponding (presumably) to the intermediate ...charged ...
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A numerical and analytical study of vortex rings with swirl
... a vortex ring is constructed by the method of the previous section, we have available an exact solution of the Euler equations of incompressible, inviscid ...thin rings, little is known about the stability ...
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Detection and direction discrimination of single vortex rings by harbour seals (Phoca vitulina)
... single vortex rings In the first set of experiments, the VRGs were mounted at an angle of 60 deg on either side of the point directly ahead of the animal ’ s bite ...single vortex ring impinged on ...
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Hydrodynamics of Buoyant Vortex Rings
... A vortex ring is a torus-shaped vortex consisting of a region of fluid spinning around an imaginary axis line that forms a closed ...buoyant vortex ring to glide higher altitudes; squid and jellyfish ...
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Formation number of confined vortex rings
... actual vortex ring, observed at the pinch-off. To this end, the vortex ring is usually described by a vortex ring model allowing one to express the main integrals of motion as functions of its ...
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Topology of interacting coiled vortex rings
... the rings were coiled? Would the rings reconnect instead of leap-frogging and what diagnostics should be used? Scheeler et ...coiled vortex rings and claim that they can follow the evolution ...
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Inviscid interaction of vortex rings: approach to singularity?
... The interaction of two vortex rings in an inviscid fluid is investigated numerically using a Lagrangian vorticity method. This method uses interpolation based on Delaunay triangulation of the computational ...
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Response of a columnar vortex to a wrapped vortex loop
... primary vortex is indicated by the vector colors in figure 8a-c, where red indicates flow to the right and blue indicates flow to the ...the rings) is directed to the ...two vortex rings and ...
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Propulsive force calculations in swimming frogs II Application of a vortex ring model to DPIV data
... recognisable vortex rings that had just been shed from one foot or both ...obtain vortex ring impulse momentum, five sequences showing a horizontal and two a vertical cross section of the ...The ...
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Application of 3D particle method to the prediction of aerodynamic sound
... two vortex rings is periodic, with each vortex ring passing through the other during one ...the vortex rings undergo a head-on collision and the ow maintains its ...
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The second curvature correction for the straight segment approximation of periodic vortex wakes
... equispaced vortex rings, two important results were ...the rings, which is proportional to the pitch of a more realistic, but more difficult, helical ...of vortex rings of constant ...
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The hydrodynamics of eel swimming
... observe the flow fields around freely swimming juvenile eels. Based on their observations, they hypothesized that eels’ wakes consist of unlinked vortex rings moving laterally (Fig.·1A). They proposed that ...
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Vortex Formation in the Tethered Flight of the Peacock Butterfly Inachis io L (Lepidoptera, Nymphalidae) and some Aspects of Insect Flight Evolution
... In the first stage, only two vortex rings are coupled, as in the feeding flight of the peacock butterfly; then the flapping wings shed a chain of coupled vortex rings, as in the tethered[r] ...
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Development of a vortex generator to perturb fish locomotion
... Based on perturbation studies conducted to evaluate human physiological responses (Marmarelis and Marmarelis, 1977; Kearney and Hunter, 1982; Bennett et al., 1992; Tangorra, et al., 2003), it was hypothesized that a fin ...
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Sound generation by the interaction of a vortex ring with a rigid sphere
... a vortex ring and a stationary rigid sphere are computed using two Lagrangian particle ...slender vortex filament scheme which tracks the motion of the filament ...desingularized vortex elements that ...
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