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The Importance of Liquid Compressibility in Calculations of Fluid Dynamics Inside a DOD Piezoelectric Ink Jet Nozzle

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This study is aimed at determining the effect of the minute liquid compressibility on the flow of ink in a piezo-diaphragm driven Drop-On-Demand (DOD) ink jet nozzle. This goal is achieved by a comparison between the results obtained numerically for compressible and incompressible flows by means of Computational Fluid Dynamics calculations. In these calculations the exact geometry of the entire flow channel is modeled. Significant differences between the two flow models are observed in many aspects of the flow and drop evolution characteristics. Also, in some cases, seemingly similar features have been found to result from different physical driving forces. Despite the low Mach number and low condensation values involved, the very slightly compressible flow and the incompressible flow are very different. It is concluded that acoustic effects cannot be ignored and the incorporation of ink compressibility in the physical analysis of this flow system is essential.
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Document Type: Research Article

Publication date: July 1, 2004

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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