インクジェットプリンタヘッドにおける気泡の成長・崩壊とそれに伴うインクの挙動

概要

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Vapor bubbles generated in conductive ink heated directly by electric current pulses can be used in an ink-jet printer to eject ink-droplets. To calculate the growth and collapse of the bubble and the flow of the ink induced by the bubble, a VOF (Volume of Fluid) method modified for computing the liquid-vapor interface with phase change was used. This modified method was proved to be valid by using a model of a spherical bubble. Because this method needs a fine grid resolution and therefore long computing time to obtain an accurate result in the three-dimensional system, a simplified method was devised to save the computing time. Using this simplified method, which was proved successful for non-spherical bubbles in the two dimensional axisymmetric system, calculations were performed to simulate the growth and collapse of the bubble and the flow of the ink in a single printhead. The calculation predicted the life of the bubble, and the velocity and volume of the ejected ink, which agreed well with measurements. For the optimum design of the print-head, the influences of the dimensions of the nozzle and ink-channel were discussed from the calculated results.
一般社団法人日本機械学会の論文
1998-03-25