10.10 Electrostatically driven inkjet. An electrostatically driven inkjet is shown in Figure 10.51. It consists of an in

[answerhappygod]

10 10 Electrostatically Driven Inkjet An Electrostatically Driven Inkjet Is Shown In Figure 10 51 It Consists Of An In 1 (53.73 KiB) Viewed 26 times

10.10 Electrostatically driven inkjet. An electrostatically driven inkjet is shown in Figure 10.51. It consists of an ink chamber in the form of a cylinder 40 μm in diameter and 40-um high with a nozzle to allow the ink out. The bottom of the ink chamber is a thin disk coated with a conducting layer on the underside. A second conducting layer on the substrate together with the conducting layer on the upper disk form a capacitor. To operate the inkjet, a voltage V 12 V is applied to the capacitor as shown. This pulls the disk into a concave form, drawing an additional amount of ink as the volume of the chamber increases. When the voltage is disconnected the disk returns to its original flat form, ejecting the extra ink. The disk is made of silicon with a coefficient of elasticity (Young's modulus) of 150 GPa and a Poisson ratio of 0.17. (a) Calculate the volume of the droplet being ejected by the inkjet. (b) Calculate the maximum pressure in the ink chamber. Silicon disk Conducting surfaces Nozzle 40 µm 40 μm Ink 12 μm 6 μm Ink reservoir V