An experimental study on bubble growth within a narrow space under an interference-piece

2006 ◽  
Vol 35 (2) ◽  
pp. 165-177
Author(s):  
Yukio Yasukawa
Keyword(s):  
Experimental Study ◽  
Bubble Growth ◽  
Narrow Space

scholarly journals Experimental study of bubble growth in superheated aqueous solution of NaCl.

1987 ◽  
Vol 13 (5) ◽  
pp. 685-690
Author(s):  
Osamu Miyatake ◽  
Itsuo Tanaka ◽  
Yuji Tsutsui
Keyword(s):  
Aqueous Solution ◽  
Experimental Study ◽  
Bubble Growth

Experimental Study of Bubble Dynamics on a Micro Heater Induced by Pulse Heating

2004 ◽  
Vol 126 (2) ◽  
pp. 259-271 ◽  
Author(s):  
Y. Hong ◽  
N. Ashgriz ◽  
J. Andrews
Keyword(s):  
Experimental Study ◽  
Bubble Growth ◽  
Bubble Dynamics ◽  
Pulse Heating ◽  
Deionized Water ◽  
Nucleation Theory ◽  
Electric Pulses ◽  
Pressure Profiles ◽  
Rapid Formation ◽  
Resistive Heater

An experimental investigation of the rapid formation and collapse of bubbles formed on a micro heater (25×80 μm2) is presented. Short electric pulses in the range of 1 μs to 4 μs are applied to the resistive heater, which is immersed in deionized water and generates a heat flux of more than 750 MW/m2. A stroboscopic technique with a time resolution of 30 ns and spatial resolution of 2 μm was used to capture the dynamics of the bubble growth and collapse. From the nucleation theory, the nucleation temperatures are close to the kinetic limit of superheat and weakly depends on the heating rate. The velocity, acceleration, and the pressure profiles after the vapor sheet formation are presented.

Experimental Study of Nucleate Boiling Heat Transfer Using Enhanced Space-Confined Structures

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Xuehu Ma ◽  
Chunjian Yu ◽  
Zhong Lan ◽  
Donghui Wang ◽  
Tao Bai
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
High Speed ◽  
Bubble Diameter ◽  
Nucleate Boiling ◽  
Large Area ◽  
Nucleation Sites ◽  
Nucleate Boiling Heat Transfer ◽  
Narrow Space ◽  
High Superheat

For narrow space boiling, it is difficult to release bubbles from the narrow space, especially on a large-area surface. To solve this problem, a new structure is designed in the present paper. An experimental study of pool boiling on the novel copper enhanced structure, with the separate ordinary confined spaces and the open channels between them, was conducted with water and ethanol. High-speed visualizations are performed to elucidate the bubble flow. The results show that the boiling performance of both water and ethanol can be enhanced effectively. The visualizations indicated that most active nucleation sites emerged in the confined channels and rarely appeared at the bare surfaces not covered by enhanced structures even at high superheat. The bubble diameter, the bubble departure frequency, and the numbers of nucleation sites are obtained using statistical methods. The results suggest that the magnitudes of bubble diameter of water are almost the same on the smooth and enhanced surfaces. The amount of nucleation sites on the enhanced surfaces is remarkably increased, indicating its key role in the boiling enhancement of water. The bubble departure frequency is increased on one of the enhanced surfaces while not increased on another, showing that it is also a significant factor for heat transfer enhancement under certain conditions. While for ethanol, all the three parameters are increased on the enhanced surfaces.

1404 Experimental Study of Hydrogen-Air-Dilution Gas Flames Propagating in a Narrow Space

2012 ◽  
Vol 2012.50 (0) ◽  
pp. 140401-140402
Author(s):  
Hiroshi MYOJIN ◽  
Mitsuru KAWARABATA ◽  
Masaya NAKAHARA ◽  
Fumiaki ABE ◽  
Kenichi TOKUNAGA
Keyword(s):  
Experimental Study ◽  
Narrow Space

1305 Experimental StUdy of Hydrogen Premixed Flames Propagating in a Narrow Space

2011 ◽  
Vol 2011.49 (0) ◽  
pp. 399-400
Author(s):  
Kazuhiro YOKOSHIMA ◽  
Masaya NAKAHARA ◽  
Hiroshi MYOHJIN ◽  
Fumiaki ABE ◽  
Keiya TANI ◽  
...  
Keyword(s):  
Experimental Study ◽  
Premixed Flames ◽  
Narrow Space
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