Pii: S0301-9322(02)00120-9
نویسندگان
چکیده
This communication describes the results of bubble rise simulations using a lattice Boltzmann method and a front-tracking finite-difference method. The simulations, performed in a 2-D periodic box, consider two specific examples: a steadily rising bubble and a bubble rising in an oscillatory manner with accompanying shape change. We compare the shapes and rise velocities of the steadily rising and oscillating bubbles, the oscillation frequencies and amplitudes, and the bubble shapes at different phases of the oscillations. The simulations reveal that both numerical schemes afford qualitatively similar results, which are within a few percent quantitatively. 2002 Elsevier Science Ltd. All rights reserved.
منابع مشابه
Pii: S0301-9322(99)00064-6
The classical Board±Hall model is re-examined and shown to imply that, contrary to the model's intention and widely-held interpretation, multiphase thermal detonations are not physically possible. A new key physical concept is introduced, and the results show the existence of supercritical detonations, even in lean (melt content) premixtures, in agreement with recent experimental evidence. This...
متن کاملPii: S0301-9322(02)00027-7
The translational velocities of elongated bubbles in continuous slug flow were measured for various flow rates, pipe inclinations and pipe diameters. Measurements were carried out by cross-correlating the output signals of consecutive optical fiber probes and by image processing technique. In addition, the velocities of single elongated bubbles in a stagnant and in a flowing liquid were measure...
متن کاملPii: S0301-9322(99)00037-3
The motion of a single elongated (Taylor) bubble propagating in a transparent vertical pipe is studied experimentally in stagnant liquid, as well as in upward and downward liquid ̄ow. Digital image processing of a sequence of video images serves as the main experimental method for the study of the Taylor bubble motion. In addition, the distribution of the velocities in front of the bubble and i...
متن کاملPii: S0301-9322(98)00066-4
The motion of elongated (Taylor) bubbles in air±water vertical ̄ow is studied by processing consecutive series of digitized video images. The shape of the elongated bubbles, as well as the velocities of the liquid±gas interfaces, are measured for various ̄ow conditions. The bubble velocity variation caused by air expansion under the in ̄uence of hydrostatic pressure gradient is measured and comp...
متن کاملPii: S0301-0082(02)00076-x
9 Self-supervised models of how the brain represents and categorises the causes of its sensory input can be divided into two classes: those that minimise the mutual information (i.e. redundancy) among evoked responses and those that minimise the prediction error. Although these models have similar goals, the way they are attained, and the functional architectures employed, can be fundamentally ...
متن کامل