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- 저자 : Shizhu Wen (검색결과 3 건)
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The State and Development of Tribology Research in China
Wen Shizhu 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
MainachievementsoftribologyresearchinChinaduringthepast25yearsweresummarized,andseveralpromisingresearchfieldsaresuggestedaccordingly.
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Joule Heating Effects on Two-phase Flows in Dielectrophoresis Microchips
Ying Yan,Dan Guo,Shizhu Wen 한국바이오칩학회 2017 BioChip Journal Vol.11 No.3
Joule heating is a significant phenomenon in dielectrophoresis-based microfluidic devices due to the local amplification of the electric field around electrodes. This leads to the temperature rising in microchannel which would influence the bioactivity of samples in the microchannel. In this paper, a numerical simulation model considering joule heating effect, electric field, and flow field is proposed to describe dynamic behaviors of two-phase flows of the dielectrophoresis microchip. The experimental methods are applied to verify the rationality of model and joule heating effects on microchips under both AC (Alternating current) and DC (Direct current) electric fields are investigated in detail. In numerical simulation part, the difference between AC and DC electric fields is compared. According to the results, it is found that with the same effective voltage, DC electric field can generate more joule heat and flow in the microchannel obtained higher temperature. This is caused by that the electric field strength around the electrodes in the DC electric field is stronger than that of the AC electric field. Secondly, effects of dispersed phase and continuous phase flow velocity are investigated and temperature will decrease with the increasing of flow velocity. Also, it is found that the Joule heating effects improve the droplet velocity based on the results. Finally, an infrared camera is applied to monitor the thermal characteristics of the microchannel to ensure that the numerical simulation is reasonable. These results are expected to provide useful guidance for future designs of dielectrophoresis-based microdevices that will avoid joule heating effects or take advantage of joule heating effects.
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Numerical simulation of droplet dynamic behaviors in a convergent microchannel
Ying Yan,Dan Guo,Jing Luo,Shizhu Wen 한국바이오칩학회 2013 BioChip Journal Vol.7 No.4
Microfluidic devices are of high efficiency for the coalescence and manipulation of monodispersed droplets. Numbers of microfluidic applications involve the control of droplets through networks of convergent or divergent junctions. The convergent microchannels are widely applied in transporting DNA and controlling other chemical and biological reactions. But there are still some problems unsolved such as that how to merge droplets more efficiently and how to guarantee the stability of the droplet in a convergent microchannel. In this work, numerical method is used to investigate the dynamic properties of the water microdroplets suspended in the convergent microchannel filled with oil. The moving of microdroplets in the convergent microchannel is driven by the initial droplet velocity. The surface tension is taken into account in the Navier-Stokes equations. The microchannel size parameter “Da” is firstly proposed to describe the convergent microchannel geometric characteristics and through which a regime map is created to classify droplets states into total coalescence regime, partial coalescence regime and no coalescence regime respectively. The dynamic behaviors of the droplets suspended in the convergent microchannel are discussed in detail. This work would contribute to the design of convergent microchannels for better biochemical analysis.
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