Fundamental Fluid Dynamics Challenges in Inkjet Printing

Detlef Lohse*

*Corresponding author for this work

Research output: Contribution to journalReview articleAcademicpeer-review

19 Citations (Scopus)
510 Downloads (Pure)

Abstract

Inkjet printing is the most widespread technological application of microfluidics. It is characterized by its high drop productivity, small volumes, and extreme reproducibility. This review gives a synopsis of the fluid dynamics of inkjet printing and discusses the main challenges for present and future research. These lie both on the printhead side-namely, the detailed flow inside the printhead, entrained bubbles, the meniscus dynamics, wetting phenomena at the nozzle plate, and jet formation-and on the receiving substrate side-namely, droplet impact, merging, wetting of the substrate, droplet evaporation, and drying. In most cases the droplets are multicomponent, displaying rich physicochemical hydrodynamic phenomena. The challenges on the printhead side and on the receiving substrate side are interwoven, as optimizing the process and the materials with respect to either side alone is not enough: As the same ink (or other jetted liquid) is used and as droplet frequency and size matter on both sides, the process must be optimized as a whole.

Original languageEnglish
Pages (from-to)349-382
Number of pages34
JournalAnnual review of fluid mechanics
Volume54
Early online date20 Oct 2021
DOIs
Publication statusPublished - Jan 2022

Keywords

  • drop coalescence
  • drop evaporation
  • drop film interaction
  • drops
  • impact
  • inkjet printing
  • jetting
  • Marangoni flow
  • nozzle
  • physicochemical hydrodynamics
  • piezoacoustics
  • pinch-off

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