Effect of Microgroove Dimensions on Deformation of the Liquid Film Under Vibration Conditions

2011 ◽  
Author(s):  
Chaohong Guo ◽  
Xuegong Hu ◽  
Wei Cao ◽  
Tao Wang ◽  
Dawei Tang
Keyword(s):  
Liquid Film ◽  
Contact Line ◽  
Flow Resistance ◽  
Groove Depth ◽  
Vertical Vibration ◽  
Groove Width ◽  
Phase Contact ◽  
Research Results

Deformation of the triple-phase contact line in various sizes of rectangular microgrooves under vertical vibration conditions was studied in this paper. Width of the rectangular microgroove ranges from 0.2 mm to 0.4mm and depth of the microgrooves is 0.2∼0.6mm. The frequency of vibration is 10Hz, and the amplitude of vibration is approximately 3.5mm. The research results show that oscillation of the liquid film in microgrooves becomes more obvious, and the triple-phase contact line is deformed more greatly when the groove width or the groove depth increases. The main reason is that the flow resistance of the liquid film in microgrooves decreases when the groove width or the groove depth increases.

Study on the Characteristics of Contact Line and Liquid Film in Rectangular Microgrooves Under Vibration Conditions

2011 ◽  
Author(s):  
Wei Cao ◽  
Xuegong Hu ◽  
Chaohong Guo ◽  
Dawei Tang
Keyword(s):  
Liquid Film ◽  
Contact Line ◽  
Heat Input ◽  
High Speed ◽  
Mechanical Vibration ◽  
Line Length ◽  
Oscillation Period ◽  
Wide Field ◽  
High Speed Camera ◽  
Phase Contact

With the help of a high-speed camera (30000 Frames/second) and a wide-field stereo-microscope, the effects of mechanical vibration on the meniscus film and triple-phase contact line in rectangular microgrooves were experimentally investigated. Distilled water was used as working liquid. The images of the oscillated meniscus film in an oscillation period were captured through the high speed camera and they were analyzed using a MATLAB program. The results show that as the vibration table moves upward, the length of contact line increases; as the vibration table moves downward, the length of contact-line decreases. During the oscillation, the axial liquid film spreads upward further along the microgrooves and the deformation of the contact line becomes more obvious. The increase of the triple-phase contact line length caused by the external mechanical vibration is helpful for contact line heat transfer enhancement. Besides, deformation curve of the contact line with and without heat input under different vibration conditions is similar, while the contact line with heat input is shorter.

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.

The Visualization Study of Contact Line Characteristics in Triangle Wetting Region of Rectangle Microgroove

2010 ◽  
Author(s):  
Tao Wang ◽  
Xuegong Hu ◽  
Chaohong Guo ◽  
Dawei Tang
Keyword(s):  
Heat Flux ◽  
Liquid Film ◽  
Contact Line ◽  
Tilt Angle ◽  
Computer Software ◽  
Side Wall ◽  
Axial Direction ◽  
Direct Visualization ◽  
Phase Contact ◽  
Line Angle

The paper acquires the images of triple phase contact line along the axial direction in microgroove triangle wetting region by the direct visualization means. The contact line images are processed by computer software, and the change law for triple phase contact line is obtained. The contact line angle between contact line and axial direction along microgroove is obtained by analyzing contact line. Results indicate that the length of contact line and the thickness of liquid film on side wall of microgroove reduce along with heat flux addition; but increase as the tilt angle increases. The contact line angle increases with the increase of tilt angle and the decrease of heat flux. In addition, changes of the length of contact line, the thickness of liquid film and the contact line angle for ethanol case is more significant than that for distilled water.

Test of the stability of a three-phase contact line with negative line tension

1999 ◽  
Vol 96 (9) ◽  
pp. 1335-1339 ◽  
Author(s):  
ALAN E. VAN GIESSEN, DIRK JAN BUKMAN, B.
Keyword(s):  
Contact Line ◽  
Line Tension ◽  
Phase Contact ◽  
Three Phase ◽  
The Stability

Faster Nucleation of Ice and Carbon Dioxide Hydrates at the Three-Phase Contact Line

2021 ◽  
Author(s):  
Aritra Kar ◽  
Awan Bhati ◽  
Palash V. Acharya ◽  
Ashish Mhadeshwar ◽  
Roger Bonnecaze ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Contact Line ◽  
Phase Contact ◽  
Three Phase
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