Considerations on Particle Sedimentation
We will introduce a discussion on the settling distance and time based on particle size!
This document presents considerations on particle settling. It includes information on the settling distance of particles per unit time and calculated values for settling distances. We have provided clear explanations using graphs and tables, so please take a look. However, this is only an example concerning solid particles. Droplets are excluded due to their significant interaction with the environment. [Contents] ■ Calculated values for particle settling distance per unit time - Settling time in the vertical direction can be calculated by particle size (in other words, the time they remain suspended) - Gravitational settling velocity of fine particles *For more details, please refer to the PDF document or feel free to contact us.
basic information
For more details, please refer to the PDF document or feel free to contact us. Particles settle due to gravity. When the particle size becomes small, the diffusion coefficient becomes significant. Smaller particle sizes result in longer suspension times. Generally, particle counters measure suspended particles, so constant-speed suction becomes an important factor. Roughly speaking, particles larger than 5 micrometers do not fit this concept. Please be aware of the behavior of particles based on their size. - Particles around 1 micrometer in biological exhaled secretions, which have a density close to 1, are difficult to diffuse and tend to remain suspended. Dead spaces and continuous supply sources lead to the concentration of particle density. However, how droplets like secretions ultimately take shape and the state of transit up to that point is not straightforward; if they ultimately become pseudo-solids, this concept applies. - Conversely, larger particles tend to fall quickly in clean rooms (though not exclusively), making them difficult to sample with particle counters and easy to overlook. - By understanding the characteristics of particles, the data from particle counters can provide more valuable information.
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Applications/Examples of results
For more details, please refer to the PDF document or feel free to contact us. There are particles in cleanroom monitoring that cannot be captured by particle counters.
