Analysis on breakup dynamics of hydrogen taylor bubble formation in a cross-junction microchannel

2021 ◽  
Author(s):  
Xingchen Li ◽  
Zan Wu ◽  
Xiaoqian Chen
Keyword(s):  
Bubble Formation ◽  
Taylor Bubble

Pinch-off mechanism for Taylor bubble formation in a microfluidic flow-focusing device

2013 ◽  
Vol 16 (6) ◽  
pp. 1047-1055 ◽  
Author(s):  
Yutao Lu ◽  
Taotao Fu ◽  
Chunying Zhu ◽  
Youguang Ma ◽  
Huai Z. Li
Keyword(s):  
Bubble Formation ◽  
Flow Focusing ◽  
Taylor Bubble ◽  
Microfluidic Flow

Fluid hydrodynamics in submerged and sidestream membrane bioreactors

2003 ◽  
Vol 48 (3) ◽  
pp. 113-119 ◽  
Author(s):  
P. Le-Clech ◽  
H. Alvarez-Vazquez ◽  
B. Jefferson ◽  
S. Judd
Keyword(s):  
Mass Transfer ◽  
Membrane Permeability ◽  
Bubble Formation ◽  
Cross Flow ◽  
Membrane Bioreactors ◽  
Air Velocity ◽  
Membrane Processes ◽  
Critical Flux ◽  
Taylor Bubble ◽  
Fluid Hydrodynamics

As with all membrane processes, turbulence, as promoted by aeration in submerged membrane bioreactors (MBRs) or pumping in sidestream (SS) systems to produce somewhat higher effective cross-flow velocities, increases mass transfer and reduces fouling. This is manifested in an elevated critical flux, the flux at which the membrane permeability is sustained. However, the non-Newtonian nature of the sludge makes precise rheological characterisation difficult. In this study, a calculation of the appropriate hydrodynamics parameters for a SS MBR configuration is presented. Optimisation of the aeration in a submerged MBR system has been attained by defining the minimum air velocity required for Taylor bubble formation.

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

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