起源於噴墨印表機噴印技術的微液滴噴射技術，隨著微機電製程之進步，供需式噴墨技術主流之一的壓電式噴墨頭之用途不止應用於傳統噴墨列印，而漸漸成為可以應用在電路基板配線、彩色濾光片、微泵浦燃油噴射、3D-RP快速成型、以及生醫工程等方面，而受到極大的注目。
　　本論文以擠壓管式壓電噴墨頭為研究對象，經由模擬之方法，採用數學模型以求解連續方程式及動量守恆方程式，在自由表面及介面重建之處理上，採用PLIC (Piecewise Linear Interface Calculation)並耦合流體體積法(Volume Fraction of Fluid , VOF)，在表面張力的處理上採用CSF (Continuum Surface Force)模式。在本研究中，用移動邊界模擬壓電管受到電壓及工作頻率驅動時之形變情形，並改變不同外形參數(管長、管徑、噴嘴口徑)及操作參數(頻率、振幅)，以求得當暫態行為結束之時，其對於管內液體各項物理量及動態行為之影響。
　　本研究透過模擬之方法，求得各條件下管內各物理量之變化並加以比較。經觀察及比較後發現管內速度及壓力大小變化會隨管長之增加、管徑及噴嘴口徑之下降、以及頻率和振幅之增加而上升，且管內速度變化和振幅及頻率成正比之關係，管內壓力變化和振幅成正比之關係，和頻率增加倍數之平方成正比。而頻率之增減，亦可增加或減少所擠壓出之液量，進而達到控制液滴大小之目的。

Micro-droplet injection technology, originated from inkjet printing technology have been applied to many appilications such as IC package, LCD color filters, micro fuel pump, 3D rapid prototyping technology, and bio-medical devices. Accompanying with progress of Micro Electro-Mechanical Systems (MEMS), piezoelectric inkjet printhead, one of the major technology of Drop-on-Demand (DOD) inkjet printheads, has raised a lot of attention because of its great ability to wide applications.
This thesis studies the squeeze mode piezoelectric inkjet printhead by the method of simulation. In this study, the numerical methods are used to solve continuity and momentum equilibrium equations for flow field , as well as VOF (Volume of Fluid) and PLIC (Piecewise Linear Interface Calculation) schemes for the free surface construction. For the treatment of surface tension effects, a CSF (Continuum Surface Force) model is employed. In this study, a moving boundary is used to express the deformation boundary conditions of a squeeze-mode piezoelectric inkjet printhead while driven by sinusoidal AC signal. The main objectives for this study is using different parameters including printhead geometry and opearation conditions to find out the influence of parameters on the dynamic behaviors inside the inkjet printhead after the vanishment of transient behavior. In this study, it is found that the velocity and pressure will be raised by the increase of the tube length, frequency and amplitude, or reduced the radius of tube and orifice. The change of maximum velocity in the device is found to be proportional to frequency and amplitude. It is noticed the maximum pressure in the device becomes linear with respect to the amplitude, and the square of frequency. The increase or decrease of frequency can also change the ejective droplet volume. Theses findings will help designers not only in the design a piezoelectric inkjet printhead, but also in control of the droplet size ejected from the piezoelectric inkjet printhead.

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