Numerical Investigation of the Spreading Behavior of Inkjet Droplets on Rough Substrate Surface

Inkjet printing is a non-contact printing technology, which has the advantages of wide substrates, environmental protection, and can meet the requirements of personalized printing. After the ink droplets are ejected from the nozzle, they fly to the surface of the printing material. The spreading results will directly affect the printing quality of inkjet printing. This present work uses ANSYS software and introduces a standard \(k - \varepsilon\) turbulence model to create a numerical calculation model of droplet spreading on rough substrate surface. The effects and relationships between droplet diameter, flight speed, fluid viscosity and droplet spreading coefficient, maximum spreading diameter and stable spreading time on the surface of rough substrates were investigated and obtained. The results provide theoretical basis for improving the quality of inkjet printing.