Relationship between the free settlement of particles and air temperature
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Solid particles settle freely in the air; if the air temperature rises, does the settling speed of the particles increase or decrease?
As the air temperature rises, its density decreases. According to the formula for settling velocity, the settling velocity should increase
As the temperature rises, viscosity decreases; the density difference can be ignored, and the settling speed increases
As the temperature rises, the disturbances become more complex, the viscosity increases, and the settling speed is greatly affected by air disturbances, resulting in a decrease in the settling speed.
However, according to the formula for the free sedimentation velocity of spherical particles, as the temperature rises, the density of air decreases, and thus the sedimentation velocity increases. How should this be understood?
As the air temperature rises, viscosity should increase; therefore, the settling speed decreases
The settling speed has nothing to do with viscosity
I’m sorry, the viscosity increases and the settling speed decreases