Smoothed particle hydrodynamics solver and the influence of the surface tension in inkjet printing
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Title
Smoothed particle hydrodynamics solver and the influence of the surface tension in inkjet printingAuthor (s)
Tutor/Supervisor; University.Department
Hernández López, Leonor; Universitat Jaume I. Departament d'Enginyeria Mecànica i Construcció; Lee, Yeaw ChuDate
2018-10Publisher
Universitat Jaume IAbstract
Nowadays, different techniques of inkjet printing are being used in several industrial
applications or even in an office or at home, due to the fact that the most of the domestic
printers use an inkjet printing ... [+]
Nowadays, different techniques of inkjet printing are being used in several industrial
applications or even in an office or at home, due to the fact that the most of the domestic
printers use an inkjet printing technique.
This project is focused on the inkjet printing on paper, which is the most common case
but not the only one. To cite one case, in the newspaper industry, an enormous amount
of papers is printed every day, so a little modification in any part of the cycle of printing
could suppose an important improvement in terms of economy.
Two factors that play an important role in inkjet printing are the surface tension of the
ink and its wettability, which is directly related to the surface tension and is characterized
by the contact angle formed between the fluid and the solid substrate (the nozzle in this
case).
The main objective of this project is then to study the influence of the surface tension in
the process of inkjet printing in order to choose the best properties, mainly the surface
tension, of the ink. This two parameters, surface tension and wettability, condition the
printing speed and quality: choosing a hydrophilic (which means a high wettability) inner
wall of the nozzle and an ink with a high surface tension should improve the speed and
quality. These results will be discussed in this project.
The presented problem corresponds to a fluid mechanics problem, and, thanks to the
enormous improvement of the power of computers in the last years, the fluid mechanics
problems can be modelled with a computer without the need to represent in a physical
model the phenomena being studied. This manner of solving the fluid dynamics problems
is called computational fluid dynamics (CFD). During this project the called Smoothed
Particle Hydrodynamics (SPH) modelling method is used.
Smoothed Particle Hydrodynamics is a mesh-free Lagrangian method which uses a particle
approximation of the fluid domain. In other words, this method does not need any mesh
or grid to compute the properties of the fluid in each spatial point. Instead of that, the
fluid domain is represented by a finite number of particles, each of them with a mass,
density, velocity, acceleration. . . The properties of each particle are computed from the
properties of the neighbours. The particles being closer to the particle of interest will
have a higher influence than the ones placed further. This is achieved thanks to a weight
function known as kernel, whose characteristic radius is called the smoothing length.
Particles being in a distance higher than this smoothing length will not be considered to
compute the physical properties of the particle of interest.
The fact of not having to create a mesh to solve the problem becomes really useful in
problems with a big deformation of the fluid domain, or in surface flows. It is for this
reason that the computation of the surface tension is implemented in an SPH solver that
could be used in the future to solve problems such as the one of the inkjet printing. [-]
Subject
Description
Treball final de Grau en Enginyeria en Tecnologies Industrials. Codi: ET1040. Curs acadèmic: 2017/2018
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