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22 January 2005 An analysis on filling processes of microfluidic flows in an oval disk-shaped chamber
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An analysis of the liquid filling processes in an oval disk-shaped micro chamber is demonstrated while associated with the micro systems at various widths of inlet and outlet which are fabricated using MEMS technology. The results are presented in terms of the movement of the gas-liquid interface. During the filling processes the front shape results from the competition among the inertia, adhesion and surface tension. The influences of non-dimensional parameters such as the Reynolds number and Weber number, both based on the inlet velocity, as well as the wall adhesive conditions on flow characteristics are investigated. The effects of the change in channel widths of a circle chamber as well as the change in lengths of semimajor axis and the semiminor axis of an oval chamber on the filling process are also studied. The above-mentioned geometric changes result in a change in the angle between the microchannels and micro chamber at intersection and significantly affect the filling phenomenon of liquid in the micro chamber. It is evident that the air entrapment appears while the strong inertia is imposed and hydrophobic property inside the chamber wall occurs. The numerical results are also compared with experimental measurements and show similar filling processes.
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Jyh Jian Chen, Wen Zhong Liu, Jenn Der Lin, Jhy Wen Wu, and Nan Kuang Yao "An analysis on filling processes of microfluidic flows in an oval disk-shaped chamber", Proc. SPIE 5718, Microfluidics, BioMEMS, and Medical Microsystems III, (22 January 2005);

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