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Calculating the Probability of Particles Traveling Through Different Size Pores
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[QUOTE="jrmichler, post: 6557139, member: 638574"] Filter theory might provide some useful insights. Some good search terms include[B] filter efficiency curves [/B]and [B]hepa filter efficiency graph[/B]. The second search came up with this document: [URL]https://donaldsonaerospace-defense.com/library/files/documents/pdfs/042665.pdf[/URL]. That document includes this graph, along with an excellent explanation of the four filter mechanisms: [ATTACH type="full"]291217[/ATTACH] The document discusses particle sizes down to 10 nm. Note that inertial impaction is insignificant with particles smaller than 200 nm. This implies that your 60 to 70 nm particles will follow the fluid through the pores, assuming that the particles have zero tendency to stick to the walls of the pores. Note that three of the four filter mechanisms depend on particles sticking to the filter media, with the fourth mechanism (sieving) trapping the particle with pores smaller than the particle. All of this suggests that the key variable is not particle size vs pore size, but whether the particles have the slightest tendency to adhere to the pore walls. What happens to forces between particles and pores at distances less than 10 nm or so? [/QUOTE]
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Calculating the Probability of Particles Traveling Through Different Size Pores
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