Leaching From Porous Metal Filter
Vacuum Cycling Nucleation (VCN) for internal cleaning of parts:
- VCN works inside tight offsets. During the initial vacuum, air is removed from the part’s interior.
- On the initial pressure cycle, fluid is forced into the void spaces within the part.
- On the subsequent vacuum cycles, vapor bubbles grow inside the part and force fluid from the internals of the part.
- Reactant chemicals, soluble material, particles, and surfactant micelles are purged from the part during this cycle.
- On the subsequent pressure cycles, fluid reenters the part’s internals, bringing fresh treatment chemicals.
- Cycling continues until the part is fully processed.
- The picture depicts the process.
Vacuum Cycle Nucleation in Small Spaces
Nucleation selectively forms in holes, trenches, and beneath particles, where convective heat transfer is restricted, thereby allowing it to progress unabated.
The video shows a wound screen 10” diameter roll producing a matrix of very small passages for fluid transfer. The screen comes from a stamping machine dripping with oil since it is wound immediately after stamping. The fluid is n-Propyl Bromide, and the screen is made of copper.