Figure 18.
The image depicts a vector field represented in two dimensions and three dimensions. The left side shows a 2 D grid comprising numerous arrows, each indicating direction and magnitude of the vector field, where the colour gradient corresponds to different values of f superscript H 2 measured in kilograms per square metre per second. The right side presents a 3 D spatial arrangement of vectors, also with varying colours to represent the magnitude of f superscript H 2. The range of values is denoted alongside both representations, providing insight into the gradient distribution in the vector field. The 2 D grid uses a structured layout, while the 3 D view offers a more complex spatial perspective, with gridlines enhancing the depth perception of the volume.Distribution of hydrogen flux at steady state for 20 mm sample size: (a) under condition HP2D and (b) under condition HP3D. Hydrogen flux includes gas-phase hydrogen and dissolved hydrogen. The lower limit of the scale used for the 3D condition is set higher than that for the 2D condition to exclude excessively small fluxes for clarity