Thesis for degree: Licentiate of Engineering

model is presented after the data conversion from the original digital image (Figure 3.1) and
the choice of border between pore and solid, i.e., white and black, was chosen to obtain a
porosity of 40%.
Figure 3.2: Image for LBM by two colors, black (solid) and white (pore), with a porosity of 40%.
The conversion process for three colors, namely white, grey and black, was also performed in
Python to create a matrix functional for MATLAB. To distinguish the three phases for the
pore and the two solid types, a phase function is defined at each pixel (z) as:
(3.2)
In Figure 3.3 the real image of the XCT scan is shown. In Figure 3.4 and 3.5 the three-colorconversion
is implemented where the choice of border between pore and solid (both grey and
black) was chosen to obtain a porosity of 40% and 60%, respectively. The black colored
patches represents YSZ, the grey Ni and the white represents the pores.
Figure 3.3: Digital image of a Ni/YSZ anode.
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