4.5 Article

Self-Stimulated Capillary Jet

期刊

PHYSICAL REVIEW APPLIED
卷 15, 期 1, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.014054

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资金

  1. ERDF [PGC2018-099217-B-I00]
  2. Spanish Research Agency Ministerio de Ciencia e Innovacion
  3. EPSRC-UK [EP/P024173/1]
  4. Department of Engineering Science, Oxford
  5. Royal Society [URF/R/180016, RGF/EA/181002]
  6. EPSRC [EP/P024173/1] Funding Source: UKRI

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Inspired by Savart's work, the study focuses on the self-stimulated dynamics of a capillary jet. A feedback loop controls surface perturbations of the jet, establishing phase-locked stimulation regimes for stability. The linear theory combining transfer functions of each stage explains the observed features.
Inspired by Savart's pioneering work, we study the self-stimulated dynamics of a capillary jet. The feedback loop is realized by extracting surface perturbations from a section of the jet itself via a laser-photodiode pair, whose amplified signal drives an electromechanical actuator that, in turn, produces pressure perturbations at the exit chamber. Under specific conditions, this loop establishes phase-locked stimulation regimes that overcome the otherwise random natural breakup. For each laser position along the jet, the gain of the amplifier acts as a selector across a discrete set of observable frequencies. The main observed features are explained by a linear theory that combines the transfer function of each stage in the loop. Our findings are relevant to continuous inkjet technologies for the production of equally sized droplets.

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