在微管道的系統中，並沒有量測相對流阻的方法，如果能知道個別管道元件其相對流阻，在整體管道的配置規劃上將會方便很多，而在三維交錯管道系列的研究中可以知道一事實，即三維交錯管道有著分流的特性，且可以以兩層基本的管道疊合的簡單構型形成，故本研究以三微交錯管道為基礎，探討利用固定深寬比下兩道流體經過交錯窗口後的分流特性，來量測兩道管道的相對流阻。
本研究以墨水、微粒子、數值模擬三種工具搭配理論分析量測交錯管道的相對流阻，在量測相對流阻前先以簡單十字管道的數據進行校準，以簡單十字管道為基礎，設計基準長度，並假設其長度管道流阻為1，並建立相對流阻量測方法及流程，探討實驗過程中的變數及變數控制，量測的方法及流程確立後再進行管道設計複雜化的相對流阻量測。而在本研究中量測混合器元件與基準長度的相對流阻，探討相對流阻的值可能存在的區間，並對三種量測工具之間的差異、分析方法作探討與比較。

In microfluid chip system, there is no method for relative flow resistance measurement. If we can find the relative flow resistance of individual pipeline components, the overall of planning the pipeline on the chip will be a lot easier to configure. From the past 3-D crossing microchannels literatures, 3-D crossing microchannels has a shunt characteristics and configuration is simple. In this study, based on the feature of 3-D crossing microchannels with fixed aspect ratio, relative flow resistance of the component channel can be obtained indirectly.
In this study, we use three kinds of measuring tools to find the relative flow resistance: light intensity of ink, micro particles counting and numerical simulation. Three tools together with theoretical analysis enable the calculation of the relative flow resistance in 3-D crossing microchannels. As a benchmark, we use a simple crossing channel with one arm as the base channel for calibration, and assuming that the base channel has relative flow resistance of 1. Carrying the relative flow resistance measurement procedures, and exploring the possible errors of the process variables. The measurement relative flow resistance of the designated complicated channel can be achieved. In this study, we measure relative flow resistance of the micro mixer relative to the baseline channel, and discuss the range of the resistance value. The pros and cons of the three measurement tools are also discussed.

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