FILTRATION

Fist and foremost ALUPOR™ is a filtering and coalescing material of volumetric filtration. The unique structure of porous aluminum consists of cavities connected by micron-sized necks. Impurities are trapped in the stagnant zones of these cavities by inertial separation via abrupt flow direction chenges.
The contaminant capacity of the material is 8 times higher than of sintered powder filters due to high volumetric porosity (50-75%). Filtration degree can be chosen from 1 to 200 microns.

The long service life and the possibility of regeneration makes ALUPOR™ the most promising filtering material. 

• nominal filtration degree (β_x = 20) up to 1 micron
• fully controlled and stable structure parameters
• high contaminant capacity: 8-10 times exceeds mesh and sintered powder filters
• high strength: maximum pressure differential up to 25 bar
• custom sizes and configurations
• frame-less design
• parts with combination of solid and porous sections in a single product
• thread cutting on both solid metal and porous sections
• service life exceeding 5 years
• operating temperature up to 250 °C
• possibility of frame-less combination of PLA with filtration membrane, mesh, or paper
• environmentally friendly — material recycles as aluminum scrap

• Gases only. Maximum efficiency of filtration for inertial mechanism of deposition will be ensured by:
  • high density ratio of fluid and contaminant
  • non-Darsyan regime of flow for more steep stream direction changes (see video above)
• Complex filtration mechanism. Filtration fineness depends on the filtration velocity and the density ratio of the contaminant and the fluid. Individual research needed in every single case
• Preliminary filtration of coarse fractions needed. The particle size distribution of the contaminant must be smaller than the size of the neck between pores. Otherwise, the pores on the filter element surface will become clogged, and it will stop working volumetrically. It will function like a conventional mesh element
• Not suitable for use in acids and alkalis
• Freezing possibility of filter element. When operating at sub-zero temperatures — heating is required.

FILTRATION PARAMETERS

STRUCTURE PROPERTIES

MECHANICAL PROPERTIES

There is an option for partial restoration of the flow characteristic of contaminated filter elements.
On the operating site, this can be done by:

• Backflushing directly in the housing (if technically possible)
• Backflushing with superheated steam directly in the housing (if technically possible)
• Washing in a solvent with filter removal from the housing

ALUPOR™ is able to be treated with 530°C annealing without mechanical loads and ultrasonic and pulse treatment. But this requires special equipment. We offer our services for restoring the flow capacity of your filter elements using special equipment:

• Pressure differential at fixed flow rate test on contaminated element
• Thermal annealing at 530°C. This removes organic contaminants.
• Backflushing in clamping fixture with superheated steam
• Washing in clamping fixture with water
• Ultrasonic/pulse treatment in special unit
• Pressure differential at fixed flow rate test on regenerated element

Contaminated element

See more...

Filtration guidelines

Understanding Particle Removal Performance in Liquids with Cartridge and Bag Filtration

Filter Test Methods

Das, M.K., Mukherjee, P.P., Muralidhar, K. (2018). Equations Governing Flow and Transport in Porous Media. In: Modeling Transport Phenomena in Porous Media with Applications. Mechanical Engineering Series. Springer, Cham.