Spontaneous generation of spiral waves by a hydrodynamic instability
نویسندگان
چکیده
منابع مشابه
Spontaneous generation of spiral waves by a hydrodynamic instability
The coiling of a thin filament of viscous fluid falling onto a surface is a common and easily reproducible hydrodynamic instability. Here we report for the first time that this instability can generate regular spiral patterns, in which air bubbles are trapped in the coil and then advected horizontally by the fluid spreading on the surface. We present a simple model that explains how these beaut...
متن کاملAbsolute versus convective instability of spiral waves
Absolute and convective instabilities of spirals are investigated using the continuous and the so-called absolute spectrum. It is shown that the nature of transport, induced by an absolute instability, is determined by spectral data of the asymptotic wave trains. The results are applied to core and far-field breakup of spiral waves in excitable and oscillatory media.
متن کاملGeneration of surface waves by shear-flow instability
We consider the linear stability of an inviscid parallel shear flow of air over water with gravity and capillarity. The velocity profile in the air is monotonically increasing upwards from the sea surface and is convex, while the velocity in the water is monotonically decreasing from the surface and is concave. An archetypical example, the ‘double-exponential’ profile, is solved analytically an...
متن کاملCrossflow instability of finite Bödewadt flows: Transients and spiral waves
The flow in an enclosed rotating cylinder with a stationary lower end wall is investigated numerically. For fast rotation rates, the flow in the interior is primarily in the azimuthal direction, with an angular momentum distribution very close to that corresponding to solid-body rotation for about the inner-half radius. The differential rotation sets up a large-scale circulation that is primari...
متن کاملComplexity of Hydrodynamic Phenomena Induced by Spiral Waves in the Belousov-Zhabotinsky Reaction
We review a series of experimental investigations on the oscillatory hydrodynamic flow appearing in a thin solution layer of the Belousov-Zhabotinsky (BZ) reaction under excitation of spiral waves. There have been many investigations to clarify the mechanism of the flow. Starting from a historical sketch, we introduce the latest findings, those closely relate to the mechanism of the oscillatory...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: EPL (Europhysics Letters)
سال: 2008
ISSN: 0295-5075,1286-4854
DOI: 10.1209/0295-5075/81/38004