Hui-Chun Chen

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Publications (2)3.37 Total impact

  • Article: High-performance microfluidic rectifier based on sudden expansion channel with embedded block structure.
    Chien-Hsiung Tsai, Che-Hsin Lin, Lung-Ming Fu, Hui-Chun Chen
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    ABSTRACT: A high-performance microfluidic rectifier incorporating a microchannel and a sudden expansion channel is proposed. In the proposed device, a block structure embedded within the expansion channel is used to induce two vortex structures at the end of the microchannel under reverse flow conditions. The vortices reduce the hydraulic diameter of the microchannel and, therefore, increase the flow resistance. The rectification performance of the proposed device is evaluated by both experimentally and numerically. The experimental and numerical values of the rectification performance index (i.e., the diodicity, Di) are found to be 1.54 and 1.76, respectively. Significantly, flow rectification is achieved without the need for moving parts. Thus, the proposed device is ideally suited to the high pressure environment characteristic of most micro-electro-mechanical-systems (MEMS)-based devices. Moreover, the rectification performance of the proposed device is superior to that of existing valveless rectifiers based on Tesla valves, simple nozzle/diffuser structures, or cascaded nozzle/diffuser structures.
    Biomicrofluidics 06/2012; 6(2):24108-241089. · 3.37 Impact Factor
  • Conference Proceeding: High performance microfludic rectifier utilizing self-induced virtual valves in a sudden expansion channel with a block structure
    Hui-Chun Chen, Chien-Hsiung Tsai, Lung-Ming Fu, Che-Hsin Lin
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    ABSTRACT: This study proposed a high performance microfluidic rectifier utilizing self-induced virtual valves in a sudden expansion channel. An embedded block structure is used to enhance the formation of vortices at the sudden expansion channel. The effective hydraulic diameter of the microchannel is reduced due to the formation of the vortices and it hence increases the flow resistance of the microchannel. Flow rectification can be achieved without using any moving part. The developed flow rectifier is able to work at high pressure conditions which most MEMS devices using moving parts can't sustain. Numerical and experimental investigations are used to evaluate the performance of the microfluidic rectifier. Results show that the embedded block structure greatly enhances the performance of the rectifier. The calculated rectification performance indexes (diodicity, Di) reach as high as 1.5 and 1.76 for experimental and numerical results, respectively. The performance of the developed microfluidic rectifier beats the performance of other valveless rectifiers utilizing Tesla valves, simple nozzle/diffuser structures or cascaded nozzle/diffuser structures.
    Micro Electro Mechanical Systems (MEMS), 2010 IEEE 23rd International Conference on; 02/2010
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