Droplet Velocity Fluctuations in Thermally Stimulated Continuous Liquid Jets

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The interesting phenomenon of the breakup of continuous liquid jets into droplets has significant practical applications, including inkjet printing. Regardless of print mode (i.e., ondemand vs. continuous), as applications require increasingly precise droplet control, inherent noise in the breakup process is becoming an area of increasing interest. We examine jitter to infer the underlying velocity fluctuations in thermally stimulated continuous fluid jets. Based upon comparisons of jets having different diameters D, as well as jets stimulated at different frequencies (hence different wavelengths λ), we find that the jitter depends significantly upon the dimensionless wavelength λ/D, showing a minimum at the natural frequency of the jet (corresponding to λ/D = 5) and a marked enhancement over the range 6 < λ/D < 8. We present an analysis of the frequency dependence of the jitter in the context of a simple model for growth of radial perturbations on the jet.

Document Type: Research Article

Publication date: January 1, 2009

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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