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題名 | 靜液壓高度與微流道對微流體流動時間影響之研究 |
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作 者 | 郭宗祥; 黃立仁; 黃宣翰; | 書刊名 | 工程應用技術學刊 |
卷期 | 2:2 2014.08[民103.08] |
頁次 | 頁82-96 |
分類號 | 440.137 |
關鍵詞 | 毛細現象; 微流道; 表面粗糙度; Capillary phenomena; Microfluidic; Surface roughness; |
語文 | 中文(Chinese) |
中文摘要 | 本文針對微流體在重力及毛細作用力共同驅動下的流動狀態進行研究,並搭配不同間隙高度為流道實驗模型,及改變液靜壓高度和粗糙度變化來進行微流體的流動實驗,粗糙度即利用二氧化碳雷射雕刻、微輪磨加工及SU-8光阻製程,分別加工出細切面(粗糙度值2.0~6.3 um)、精切面(粗糙度值0.25~1.6 um)及超光面(粗糙度值0.01~0.20 um)之壓克力微流道,最後將實驗結果之流動時間與參數相互比較驗證。 由結果顯示液靜壓高度,微流道內流體流動時間愈快,間隙高度實驗模型隨著微流道間隙越小時,重力的驅動力對流動時間的影響則越不明顯,即在越微小間隙的流道中毛細力成為驅動液體運動的主要動力來源。最後針對不同粗糙度表面對微流體流動時間的影響作研究,應用不同重力大小來進行微流體的流動實驗,再將實驗結果相互比較驗證,以探討粗糙度對微流體流動時間的影響;結果顯示粗糙度值越大,微流體的流動速度越快,而其波前則越不穩定,且隨著重力驅動力的增加,三種不同粗糙度微流道之流動時間彼此間之差異越大。 |
英文摘要 | In recent years, because of the rapid development of MEMS and micromachining, many applications of the capillary flow is widely developing in some modern processes, such as underfilling of flip chip, flow in microfluidic chip or biochip, and a variety of other fields. In this paper, Then flows in rectangular microchannels driven by capillary force and gravity are discussed Finally, the influence of surface roughness in microchannel is studied, we utilize carbon dioxide laser, the microgrinding processing and SU-8, in order to separately make the detailed tangent plane (roughness 2.0~6.3 um),; furthermore, the theoretical model of flow in microchannel driven by capillary force and gravity is formulated from the Navier-Stokes equations. A close form solution to predict flow time was developed, and experiments have been fabricated to investigate and verify the flow times in microchannel. From the results, the predicted flow times show reasonably good agreement with the corresponding experimental flow times. Moreover, when the microchannel height is small, the effects of gravity force becomes less obvious, namely the capillary force becomes the dominate source to drive microfluidic. The precise tangent plane (roughness 0.25~1.6 um), and the smooth tangent plane (roughness0.01~0.20 um) of the acrylic microchannel, and the experiment modules are built and the height of silicone oil in reservoir is changed, in order to figure out the influence of different surface roughness on the flowing time of the microfluidic. From the results, it shows that the surface roughness is increased, then the flow time is less, and the flow-front of microfluidic becomes more unsteady. |
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