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http://dx.doi.org/10.3795/KSME-B.2010.34.5.471

Investigation of Bubble Behavior in Rectangular Microchannels for Different Aspect Ratios  

Choi, Chi-Woong (Dept. of Mechanical Engineering, Pohang university of Science and Technology)
Yu, Dong-In (Dept. of Mechanical Engineering, Pohang university of Science and Technology)
Kim, Moo-Hwan (Dept. of Mechanical Engineering, Pohang university of Science and Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.34, no.5, 2010 , pp. 471-479 More about this Journal
Abstract
The adiabatic two-phase flow in single rectangular microchannels was studied for different aspect ratios. The working fluids were liquid water and nitrogen gas. The hydraulic diameters of the rectangular microchannels were 490, 322, and $143\;{\mu}m$, and the widths of the microchannels were around $500\;{\mu}m$. The two-phase flow pattern was visualized using a high-speed camera and a long-distance microscope. This study was focused on bubble flow regimes. From the visualized images, the bubble velocity, bubble length, number of bubbles, and void fraction were evaluated. Further, the pressure drop in a single bubble was evaluated by using a unit cell model. The bubble velocity is proportional to the superficial velocity. Further, the relationship between the void fraction and the volumetric quality is linear. The pressure drop in a single elongated bubble is strongly related to the aspect ratio. Finally, the new correlation about the pressure drop of a single elongated bubble in the rectangular microchannel was proposed.
Keywords
Microchannel; Aspect Ratio; Bubble;
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