Filter Basics
What is a filter?
A porous device for removing impurities or solid particles from a liquid or gas passed through it
Explain the difference between Pressure and Vacuum Flow Systems
Pressure systems push flow through the filter while vacuum systems pull flow through the filter.
DOUBLE JEOPARDY
Name a type of Pressure system.
How many microns does it take for something to be considered a "macro particle?"
10 microns and higher
Which type, Wovens or Nonwovens, is most prevalent in the filtration industry?
Nonwovens
Name a pourous medium typically used for absorption.
Sponge
Name 3 examples of Filter Media.
Cellulose / Cotton
Glass
Synthetic Fibers
Describe the difference between a surface vs. a depth filter.
Surface filtration collects particulate on surface of media while depth filtration traps particulate within the media.
Which is smaller, Ultra or Nano-sized?
Nano sized is smaller.
DOUBLE JEOPARDY
Give an example of something Ultra and Nano-sized
Explain the wetlaid process.
Slurry, Laid in Web Pattern, Layered and Glued
Using three arrows, describe the proportionality of resistance, pressure drop, and flow rate.
Resistance UP
Pressure drop UP
Flow rate DOWN
What is the difference between Upstream and Downstream?
Upstream is the incoming side
Downstream is the outgoing side
DOUBLE JEOPARDY
In filtration, we also use "discharge" and "input" sides. Which refers to upstream?
Describe Continuous vs. Batch Filters
Continuous filters are used without disruption of flow until pressure limits are met from buildup on filter while batch filters are used through cycles where flow is interrupted to remove buildup and then used again.
Is a virus filtration micro or ultra?
Ultra
Is meltblown a process for organic or synthetic fibers?
Synthetic Fibers
Describe Permeability, Porosity, and Tortuosity.
Permeability: ease of a gas or liquid to flow through a porous material
Porosity: % Void Volume
Tortuosity: how indirect or complex the flow through a porous material
DOUBLE JEOPARDY
Describe their relationship to each other.
Explain the difference between a Filtrate and a Retentate?
Retentates are the particles that were blocked by the filter
Describe dead end filtration vs cross flow filtration.
Dead end filtration is where fluid flow is perpendicular to the surface of the media where cross flow filtration is there fluid flow is parallel to the surface of the media.
Sort Smallest to Largest: Micro, Ultra, Macro, and Nano
Nano
Ultra
Micro
Macro
Describe the process of Spunbond technology.
Melting polymers, Filament spinning, Web formation, Bonding
DOUBLE JEOPARDY
Give an example of something that has been through the Spunbond process
True or False.
Pressure Drop is the ONLY deciding factor in regard to Flow Rate.
FALSE.
Tortuosity, Pressure Drop, Path Length, Pore Size, Pore Connectedness and more decide Flow Rate
TIME CHALLENGE (30 sec)
Draw a filtration process and diagram:
Filter
Upstream and Downstream
Filtrate and Retentate.
TIME CHALLENGE (45 sec)
Diagram an air cabin filter and label the following:
Pressure/Vacuum
Surface/Depth
Batch/Continuous
Dead End/Cross Flow
TIME CHALLENGE (30 Sec)
Most MERV numbers (1-10 especially) fit which size classification?
HOT SEAT
Which company owns ForceSpinning Technology?
TIME CHALLENGE (30 Secs)
Using these filtration terms, sell me on a product that will take my laminar flow and turn it into a turbulent flow.