Vergleichbare Effizienz von CPAP-Beatmung mit Flow-Driver und Bubble-System bei Frühgeborenen

2016 ◽  
Vol 05 (02) ◽  
pp. 99-100
Keyword(s):  
Bubble System

Dynamics of the delay-coupled bubble system combined with the stochastic term

2021 ◽  
Vol 148 ◽  
pp. 111053
Author(s):  
Qiubao Wang ◽  
Zikun Han ◽  
Xing Zhang ◽  
Yuejuan Yang
Keyword(s):  
Bubble System ◽  
Stochastic Term

scholarly journals An experimental study of the dynamics of ascent of the bubble system in the presence of a surfactant

2018 ◽  
Vol 194 ◽  
pp. 01002
Author(s):  
Alexandra Antonnikova ◽  
Sergey Basalaev ◽  
Anna Usanina ◽  
Eugene Maslov
Keyword(s):  
Experimental Study ◽  
Reynolds Numbers ◽  
Experimental Setup ◽  
Bubble Cluster ◽  
Bubble System ◽  
Wide Range ◽  
Compact Cluster ◽  
Glycerol Medium

This paper presents investigations on the new experimental setup for obtaining a compact cluster of monodisperse bubbles of a given diameter is presented. Also we provided the results of experimental study of the bubble cluster floating-up in the presence of a surfactant in a wide range of Reynolds numbers. There was held a comparison of the dynamics of the floating-up of a monodisperse bubble cluster in a glycerol medium and in the medium glycerin supplemented with a surfactant.

On the boundary integral method for the rebounding bubble

2007 ◽  
Vol 570 ◽  
pp. 407-429 ◽  
Author(s):  
M. LEE ◽  
E. KLASEBOER ◽  
B. C. KHOO
Keyword(s):  
Energy Loss ◽  
Integral Method ◽  
Bubble Radius ◽  
Experimental Studies ◽  
Boundary Integral ◽  
Boundary Integral Method ◽  
Bubble Collapse ◽  
Solid Boundary ◽  
Bubble System ◽  
Toroidal Bubble

The formation of a toroidal bubble towards the end of the bubble collapse stage in the neighbourhood of a solid boundary has been successfully studied using the boundary integral method. The further evolution (rebound) of the toroidal bubble is considered with the loss of system energy taken into account. The energy loss is incorporated into a mathematical model by a discontinuous jump in the potential energy at the minimum volume during the short collapse–rebound period accompanying wave emission. This implementation is first tested with the spherically oscillating bubble system using the theoretical Rayleigh–Plesset equation. Excellent agreement with experimental data for the bubble radius evolution up to three oscillation periods is obtained. Secondly, the incorporation of energy loss is tested with the motion of an oscillating bubble system in the neighbourhood of a rigid boundary, in an axisymmetric geometry, using a boundary integral method. Example calculations are presented to demonstrate the possibility of capturing the peculiar entity of a counterjet, which has been reported only in recent experimental studies.

scholarly journals Interpreting the interfacial and colloidal stability of bulk nanobubbles

Soft Matter ◽  
2018 ◽  
Vol 14 (47) ◽  
pp. 9643-9656 ◽  
Author(s):  
N. Nirmalkar ◽  
A. W. Pacek ◽  
M. Barigou
Keyword(s):  
Colloidal Stability ◽  
The Novel ◽  
Bubble System

This paper elucidates parts of the mystery behind the interfacial and colloidal stability of the novel bubble system of bulk nanobubbles.

scholarly journals Effects of Shell Encapsulation on the Nonlinear Dynamics of a Microbubble Contrast Agent subjected to Acoustic Energy

2018 ◽  
Vol 225 ◽  
pp. 04015
Author(s):  
Fatimah Dzaharudin ◽  
Najihah Mohd Ali ◽  
Erny Afiza Alias ◽  
Ummu Kulthum Jamaludin
Keyword(s):  
Biomedical Applications ◽  
Equations Of Motion ◽  
Numerical Data ◽  
Acoustic Energy ◽  
Gene Control ◽  
Governing Equations ◽  
Microbubble Contrast Agent ◽  
Bubble System ◽  
Acoustic Signature ◽  
Lower Amplitude

The effects of encapsulating a microbubble on the energy in oscillation and acoustic signature is investigated by solving the governing equations of motion. Numerical data obtained by solving these equations is used to explore the effects of shell on the harmonics of the bubble system. By encapsulating the microbubble with a shell, the bubble will be stiffer resulting in lower amplitude oscillations and an increase in the harmonics of the bubble system upon subjected to acoustic energy. This is desirable in triggering vascular permeability for drug/gene control and release in biomedical applications.

scholarly journals Automatic mesh generation in finite element analysis using dynamic bubble system

1997 ◽  
Vol 81 (8) ◽  
pp. 4085-4087 ◽  
Author(s):  
Vlatko Čingoski ◽  
Ryo Murakawa ◽  
Kazufumi Kaneda ◽  
Hideo Yamashita
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mesh Generation ◽  
Element Analysis ◽  
Automatic Mesh Generation ◽  
Bubble System ◽  
Automatic Mesh

scholarly journals Effect of Closure Characteristics of Annular Jet Mixed Zone on Inspiratory Performance and Bubble System

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1392
Author(s):  
Chao Wang ◽  
Chuanzhen Wang ◽  
Anghong Yu ◽  
Mingdong Zheng ◽  
Md. Shakhaoath Khan
Keyword(s):  
Size Distribution ◽  
Bubble Size ◽  
Bubble Size Distribution ◽  
Gas Content ◽  
Liquid Ratio ◽  
Flow Zone ◽  
Mixed Flow ◽  
Flotation Process ◽  
Bubble System ◽  
Annular Jet

In the flotation process, gas-liquid properties and the bubble system greatly influence bubble mineralization. In order to clarify how the mechanism applies to the closure characteristics of an annular jet mixed flow zone on the inspiratory performance and the bubble system, different degrees of closure on the velocity field and gas-liquid ratio in the mixed flow zone were investigated using numerical simulation. The variations in the characteristics of bubble size distribution, rising velocity, and gas content under different closure levels were measured with a high-speed dynamic camera technology. The results confirmed that when the closure degrees of the mixed flow zone improved, the inlet jet could gradually overcome the static pressure outside the nozzle effectively. It formed a gas-liquid mixing zone with high turbulence first, and a large pressure difference at the gas-liquid junction second. This helped to increase the inspiratory capacity. At the same time, the gas-liquid ratio rose gradually under conditions of constant flow. When the nozzle outlet was completely closed, the gas-liquid ratio gradually stabilized. For the bubble distribution system, an enhancement in the closure degrees can effectively reduce the bubble size, and subsequently, the bubble size distribution became more uniform. Due to the improved gas-liquid shear mixing, the aspect ratio of the bubbles can be effectively changed, consequently reducing the bubble rising speed and increasing the gas content and bubble surface area flux of the liquid.

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