  Effects of nanostructured defects of copper solid surface on the bubble
growth in liquid argon have been investigated through a hybrid
atomistic-continuum method. The same solid surfaces with five different
nanostructures, namely, wedge defect, deep rectangular defect (R-I), shallow
rectangular defect (R-II), small rectangular defect (R-III) and no defect, have
been modeled at molecular level. The liquid argon is placed on top of the hot
solid copper with superheat of 30 K after equilibration is achieved with CFD-MD
coupled simulation. Phase change of argon on five nanostructures has been
observed and analyzed accordingly. The results showed that the solid surface
with wedge defect tends to induce a nano-bubble relatively more easily than the
others, and the larger the size of the defect is the easier the bubble
generate.
