INVESTIGATION ON BUBBLE DYNAMIC BEHAVIORS UNDER PULSE HEATING

2018 ◽  
Author(s):  
S.C. Wu ◽  
Xiangdong Liu ◽  
Chengbin Zhang ◽  
Yongping Chen
Keyword(s):  
Pulse Heating ◽  
Bubble Dynamic ◽  
Dynamic Behaviors

The Impact of Bubble Dynamic Behaviors on Liquid Film in Open Capillary Microgrooves

2011 ◽  
Author(s):  
Yang Cao ◽  
Xuegong Hu ◽  
Dawei Tang ◽  
Chaohong Guo ◽  
Xuelei Nie
Keyword(s):  
Heat Transfer ◽  
Liquid Film ◽  
Contact Line ◽  
Thin Liquid Film ◽  
Maximum Speed ◽  
Phase Contact ◽  
Bubble Dynamic ◽  
Dynamic Behaviors ◽  
Liquid Drops ◽  
The Impact

In this paper, the characteristics of bubble dynamic behaviors and the impacts on the triple-phase contact line are studied by a visualization investigation. A high-speed digital camera with maximum speed of 30000 frames per second is adopted to record the period of bubble growth and the geometry of the splashed liquid drops. The information of the bubble dynamic behavior and the liquid drops volume can be analyzed through the software MATLAB. The statistics of the splashed liquid drops is adopted under different heat flux conditions. The experimental results show that the bubble dynamic behaviors lead to the fluctuation of the triple-phase contact line and the splashed liquid drops make the heat transfer capability of the film in microgrooves less than its theoretical maximum value. The investigation indicates that the bubble behaviors can influence the performance of heat transfer through the fluctuations of the triple-phase contact line in the thin liquid film in microgrooves. And the splashed liquid drops appearing in boiling process can also affect the heat transfer of the liquid film in open capillary microgrooves.

Experimental measurement and theoretical analysis on bubble dynamic behaviors in a gas-liquid bubble column

2020 ◽  
Vol 211 ◽  
pp. 115295 ◽  
Author(s):  
Yefeng Zhou ◽  
Panxing Kang ◽  
Zhengliang Huang ◽  
Pan Yan ◽  
Jingyuan Sun ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Experimental Measurement ◽  
Bubble Column ◽  
Bubble Dynamic ◽  
Dynamic Behaviors ◽  
Liquid Bubble

Visualization of Micro Vapor Bubble Dynamic Behaviors in Open Capillary Microgrooves

2008 ◽  
Author(s):  
Xuegong Hu ◽  
Liyuan Wu ◽  
Dawei Tang
Keyword(s):  
Bubble Growth ◽  
Nucleate Boiling ◽  
Image Processing Technique ◽  
Bubble Coalescence ◽  
Maximum Speed ◽  
Initial Growth ◽  
Vapor Bubbles ◽  
Bubble Dynamic ◽  
Dynamic Behaviors ◽  
Micro Bubble

In this paper, a visualization investigation on micro bubble dynamic behaviors in vertical rectangular capillary microgrooves is conducted. With the help of a high-speed digital camera with the maximum speed of 30000 frames per second, a CCD camera and a stereomicroscope, the processes of formation, growth, coalescence and collapse of micro vapor bubbles in the microgrooves are observed. Bubble profile and size can be determined by image processing technique with MATLAB. The results show that micro vapor bubbles have four evolution modes. They include individual micro bubble growth and collapse along a microgroove, individual micro bubble growth and collapse across neighboring microgrooves, micro bubble coalescence and collapse along the same microgroove, and micro bubble coalescence and collapse across neighboring microgrooves. Whichever mode occurs, micro bubble doesn’t depart from the bottom of microgroove before it collapses. Experimental results about time-varying micro bubble sizes are distinctly different from those of theoretical calculation results by dynamic microlayer model for nucleate boiling heat transfer. Micro bubble breakup always occurs during the initial growing stage of bubble and collapse time is far shorter than the end time of the initial growth of individual bubble obtained by the dynamic microlayer model. Theoretical analysis indicates that interface effect and geometric structures of the microgrooves are responsible for the differences.

Visualization of bubble dynamic behaviors during photoelectrochemical water splitting with TiO2 photoelectrode

2020 ◽  
Vol 347 ◽  
pp. 136230
Author(s):  
Zhenshan Cao ◽  
Yechun Wang ◽  
Qiang Xu ◽  
Yuyang Feng ◽  
Xiaowei Hu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Bubble Dynamic ◽  
Dynamic Behaviors ◽  
Tio2 Photoelectrode

Enabling Dynamic Behaviors With Aerodynamic Drag in Lightweight Tails

2021 ◽  
pp. 1-10
Author(s):  
Joseph Norby ◽  
Jun Yang Li ◽  
Cameron Selby ◽  
Amir Patel ◽  
Aaron M. Johnson
Keyword(s):  
Aerodynamic Drag ◽  
Dynamic Behaviors
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