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IBM Journal of Research and Development  
Volume 28, Number 3, Page 322 (1984)
Non-impact Printing Technology
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Numerical Calculation of the Fluid Dynamics of Drop-on-Demand Jets

by J. E. Fromm
A numerical method that makes use of the complete incompressible flow equations with a free surface is discussed and used to study an impulsively driven laminar jet. Flow behavior dependence upon fluid properties (characterized by a Reynolds number over Weber number nondimensionalization) is compared for drop integrity purposes. Several variations of square wave pressure history applied at a nozzle inlet are discussed in relation to drop velocities produced and structure of ejected drops. Timewise development of flow both interior and exterior to the nozzle is illustrated through computed contour sequences.
Related Subjects: Fluids and fluid dynamics; Printing, ink jet; Printing, non-impact