Oscillation dynamics in active topological metamaterials

2021 ◽  
Author(s):  
Dimitrios Sounas
Keyword(s):  
Oscillation Dynamics

scholarly journals On the statics and dynamics of fully confined bubbles

2017 ◽  
Vol 827 ◽  
pp. 194-224 ◽  
Author(s):  
Olivier Vincent ◽  
Philippe Marmottant
Keyword(s):  
Bubble Growth ◽  
Liquid Velocity ◽  
Plant Cells ◽  
Natural Oscillation ◽  
Bubble Collapse ◽  
Statics And Dynamics ◽  
Stability Phase Diagram ◽  
Oscillation Dynamics ◽  
Solid Walls ◽  
Gas Compressibility

We investigate theoretically the statics and dynamics of bubbles in fully confined liquids, i.e. in liquids surrounded by solid walls in all directions of space. This situation is found in various natural and technological contexts (geological fluid inclusions, plant cells and vessels, soil tensiometers, etc.), where such bubbles can pre-exist in the trapped liquid or appear by nucleation (cavitation). We focus on volumetric deformations and first establish the potential energy of fully confined bubbles as a function of their radius, including contributions from gas compressibility, surface tension, liquid compressibility and elastic deformation of the surrounding solid. We evaluate how the Blake threshold of unstable bubble growth is modified by confinement and we also obtain an original bubble stability phase diagram with a regime of liquid superstability (spontaneous bubble collapse) for strong confinements. We then calculate the liquid velocity field associated with radial deformations of the bubble and strain in the solid, and we predict large deviations in the kinematics compared to bubbles in extended liquids. Finally, we derive the equations governing the natural oscillation dynamics of fully confined bubbles, extending Minnaert’s formula and the Rayleigh–Plesset equation, and we show that the compressibility of the liquid as well as the elasticity of the walls can result in ultra-fast bubble radial oscillations and unusually quick damping. We find excellent agreement between the predictions of our model and recent experimental results.

scholarly journals Advancing Knowledge of ENSO in a Changing Climate

Eos ◽  
2020 ◽  
Vol 101 ◽  
Author(s):  
Michael McPhaden ◽  
Agus Santoso ◽  
Wenju Cai
Keyword(s):  
Southern Oscillation ◽  
Research Progress ◽  
Changing Climate ◽  
Oscillation Dynamics

A new book highlights research progress on El Ni�o Southern Oscillation dynamics and impacts and how they may change in a warmer world.

Oscillation Dynamics of Drops on Immiscible Thin Liquid Films

Langmuir ◽  
2022 ◽  
Author(s):  
Huy Tran ◽  
Ziwen He ◽  
Jordan Sakakeeny ◽  
Yue Ling ◽  
Min Y. Pack
Keyword(s):  
Liquid Films ◽  
Thin Liquid Films ◽  
Oscillation Dynamics

scholarly journals Thermal switch of oscillation frequency in Belousov–Zhabotinsky liquid marbles

2019 ◽  
Vol 6 (4) ◽  
pp. 190078 ◽  
Author(s):  
Andrew Adamatzky ◽  
Claire Fullarton ◽  
Neil Phillips ◽  
Ben De Lacy Costello ◽  
Thomas C. Draper
Keyword(s):  
Ambient Temperature ◽  
Oscillation Frequency ◽  
Electrical Potential ◽  
Powder Coating ◽  
External Control ◽  
Potential Oscillations ◽  
Bz Reaction ◽  
Liquid Marbles ◽  
Thermal Switch ◽  
Oscillation Dynamics

External control of oscillation dynamics in the Belousov–Zhabotinsky (BZ) reaction is important for many applications including encoding computing schemes. When considering the BZ reaction, there are limited studies dealing with thermal cycling, particularly cooling, for external control. Recently, liquid marbles (LMs) have been demonstrated as a means of confining the BZ reaction in a system containing a solid–liquid interface. BZ LMs were prepared by rolling 50 μl droplets in polyethylene (PE) powder. Oscillations of electrical potential differences within the marble were recorded by inserting a pair of electrodes through the LM powder coating into the BZ solution core. Electrical potential differences of up to 100 mV were observed with an average period of oscillation ca 44 s. BZ LMs were subsequently frozen to −1°C to observe changes in the frequency of electrical potential oscillations. The frequency of oscillations reduced upon freezing to 11 mHz cf. 23 mHz at ambient temperature. The oscillation frequency of the frozen BZ LM returned to 23 mHz upon warming to ambient temperature. Several cycles of frequency fluctuations were able to be achieved.

scholarly journals Oscillation dynamics of a bubble rising in viscous liquid

2019 ◽  
Vol 60 (8) ◽  
Author(s):  
G. Kong ◽  
H. Mirsandi ◽  
K. A. Buist ◽  
E. A. J. F. Peters ◽  
M. W. Baltussen ◽  
...  
Keyword(s):  
Viscous Liquid ◽  
Bubble Rising ◽  
Oscillation Dynamics

scholarly journals Spreading and oscillation dynamics of drop impacting liquid film

2019 ◽  
Vol 881 ◽  
pp. 859-871 ◽  
Author(s):  
Xiaoyu Tang ◽  
Abhishek Saha ◽  
Chao Sun ◽  
Chung K. Law
Keyword(s):  
Film Thickness ◽  
Liquid Film ◽  
Liquid Surface ◽  
Strong Dependence ◽  
Solid Substrate ◽  
Spreading Dynamics ◽  
Viscous Loss ◽  
Shape Oscillation ◽  
Oscillation Dynamics ◽  
The Impact

We herein report an experimental study to explore the effects of impact inertia, film thickness and viscosity on the dynamics of shape deformation of a drop impacting a liquid film. We have identified that the spreading dynamics shows a weak dependence on impact inertia, but strongly depends on the film thickness. For a thick film, the liquid surface deforms and absorbs part of the impact energy, and hence inhibits spreading of the drop. For a thin film, the drop motion is restricted by the bottom solid substrate, promoting spreading. The periodicity of the capillary controlled shape oscillation, on the other hand, is found to be independent of impact inertia and film thickness. The damping of the shape oscillation shows strong dependence on the film thickness, in that the oscillation decays faster for smaller film thicknesses, due to the enhanced viscous loss.

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