Measurement and reduction of micro-bubble formation in high-viscosity fluids

2012 ◽  
Author(s):  
Glenn Tom ◽  
Wei Liu
Keyword(s):  
Bubble Formation ◽  
High Viscosity ◽  
Micro Bubble

Hydrodynamics and Mixer-Induced Bubble Formation in Micro Bubble Columns with Single and Multiple-Channels

2006 ◽  
Vol 29 (9) ◽  
pp. 1015-1026 ◽  
Author(s):  
V. Haverkamp ◽  
V. Hessel ◽  
H. Löwe ◽  
G. Menges ◽  
M. J. F. Warnier ◽  
...  
Keyword(s):  
Bubble Formation ◽  
Bubble Columns ◽  
Multiple Channels ◽  
Micro Bubble

Use of sonic waves in bubble formation, microhardness and fluoride release of a high‐viscosity glass‐ionomer cement

2019 ◽  
Vol 10 (4) ◽  
Author(s):  
Nallu Gomes Lima Hironaka ◽  
Juliana Quintino Trizzi ◽  
Natália Miwa Yoshida ◽  
Jaime Aparecido Cury ◽  
Cinthia Pereira Machado Tabchoury ◽  
...  
Keyword(s):  
Bubble Formation ◽  
Glass Ionomer Cement ◽  
High Viscosity ◽  
Fluoride Release ◽  
Glass Ionomer ◽  
Sonic Waves ◽  
Ionomer Cement

Micro-bubble formation with organic membrane in a multiphase microfluidic system

2008 ◽  
Vol 143 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Takahiro Arakawa ◽  
Takahiro Yamamoto ◽  
Shuichi Shoji
Keyword(s):  
Bubble Formation ◽  
Microfluidic System ◽  
Micro Bubble

Transient Thermal Bubble Formation on Polysilicon Micro-Resisters

2001 ◽  
Vol 124 (2) ◽  
pp. 375-382 ◽  
Author(s):  
Jr-Hung Tsai ◽  
Liwei Lin
Keyword(s):  
Bubble Formation ◽  
Bubble Nucleation ◽  
Heat Diffusion ◽  
Input Current ◽  
Transient Temperature ◽  
Nucleation Behavior ◽  
Middle Range ◽  
Macro Scale ◽  
Micro Bubble ◽  
Transient Thermal

Transient bubble formation experiments are investigated on polysilicon micro-resisters having dimensions of 95 μm in length, 10 μm or 5 μm in width, and 0.5 μm in thickness. Micro resisters act as both resistive heating sources and temperature transducers simultaneously to measure the transient temperature responses beneath the thermal bubbles. The micro bubble nucleation processes can be classified into three groups depending on the levels of the input current. When the input current level is low, no bubble is nucleated. In the middle range of the input current, a single spherical bubble is nucleated with a waiting period up to 2 sec while the wall temperature can drop up to 8°C depending on the magnitude of the input current. After the formation of a thermal bubble, the resister temperature rises and reaches a steady state eventually. The bubble growth rate is found proportional to the square root of time that is similar to the heat diffusion controlled model as proposed in the macro scale boiling experiments. In the group of high input current, a single bubble is nucleated immediately after the current is applied. A first-order model is proposed to characterize the transient bubble nucleation behavior in the micro-scale and compared with experimental measurements.

Research on the Change of Energy in the Process of the Micro Bubble Formation with Dissolved Air Method

2013 ◽  
Vol 664 ◽  
pp. 390-394
Author(s):  
Yu Guang Fan ◽  
Zhao Liu ◽  
Jing Ming Li ◽  
San Ping Zhou ◽  
Bing Chen ◽  
...  
Keyword(s):  
Free Energy ◽  
Bubble Formation ◽  
Bubble Radius ◽  
Initial Energy ◽  
Free Energy Change ◽  
Nucleation Theory ◽  
Energy Change ◽  
Micro Bubble ◽  
Bubble Number ◽  
Two Stages

The generation method of dissolved gas micro bubble is introduced in the paper. The micro bubble producing process can be divided into two stages-nucleation and expansion through analysis. The formation process and the free energy change of the micro bubble is analyzed according to the homogeneous nucleation theory, free energy change formula of the two process is derived, and relation between bubble radius and formation bubble number under certain conditions is also discussed. It is concluded that the smaller the radius of formed bubbles, the more free energy change and initial energy are needed according to the analysis of the relation above.

Gas Bubble Sizes Formed in Liquids at Different Resonant Frequencies

2009 ◽  
Vol 74 ◽  
pp. 105-108
Author(s):  
Chiang Ho Cheng ◽  
Chia Lan Chang ◽  
Tsung Hsing Chan
Keyword(s):  
High Speed ◽  
Bubble Formation ◽  
Ccd Camera ◽  
Driving Voltage ◽  
Charge Coupled Device ◽  
Meniscus Shape ◽  
Micro Bubble ◽  
Mems Technology ◽  
Nozzle Plate ◽  
Bubble Sizes

The present research applies the microelectronmechanical system (MEMS) technology to design and fabricate a novel micro-bubble generator by using a piezoelectric actuator. The main structure of the proposed generator adopts an annular piezoelectric ceramic which is coupled with a nickel nozzle plate. In the experiment, a flow visualization setup employs a high magnification microscope and a high speed charge coupled device (CCD) camera to photograph the time evolution of meniscus shape of gaseous bubbles dispensed from the micro-bubble generator. The bubble formation process including the effects of inlet gas pressure as well as driving voltage and resonance frequency on generated bubble size is also discussed in the study.

Regimes of Micro-bubble Formation Using Gas Injection into Ladle Shroud

2018 ◽  
Vol 49 (3) ◽  
pp. 953-957 ◽  
Author(s):  
Sheng Chang ◽  
Xiangkun Cao ◽  
Zongshu Zou
Keyword(s):  
Bubble Formation ◽  
Gas Injection ◽  
Micro Bubble
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