Nucleation selectively forms in the holes, trenches, and under particles where convective heat transfer is restricted, thus allowing nucleation to progress unabated.

Leaching From Porous Metal Filter

Vacuum Cycling Nucleation (VCN) for internal cleaning of parts: 

  • VCN works inside tight offsets. On the initial vacuum air is removed from the internals of the part.
  • 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.
  • The video shows some applications.

 

VIDEO: INDUSTRIAL PARTS CLEANER FOR POROUS MATERIALS: The video shows screen wound in a 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.