A Scanning Electron Microscope (SEM) was used to examine pool boiling nucleation sites on 304 stainless steel in contact with distilled, degassed water. Nucleation sites were located during the boiling process by noting the coordinates of the bubble locations on the surface. These locations were then magnified using the SEM and photographs made of the nucleation sites. The radii of the cavities varied from 14.8μ-in. to 180μ-in. and the widths of grooves varied from 75μ-in. to 154μ-in.
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