Abstract
A Stemme drop‐on‐demand ink‐jet printer nozzle consists of two closely spaced orifices in series. To provide insight into the nozzle fluid dynamics, a study of impedance and flow distribution was conducted. Air was used as a working fluid, and orifices were fabricated in equal diameter plates attached to a piston‐driven cylinder. The outer orifice and the space between the plates were open to ambient air. Hot‐wire anemometry and a standing wave resonance method were used to measure air velocity and orifice impedance, respectively. Impedance data exhibited the nonlinear behavior characteristic of a single orifice. Velocity data showed that orifice plate spacing has the largest effect on fluid velocity through the outer orifice.
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