Mobilitätsdurchmesser

Mobilitätsdurchmesser, often translated as "mobility diameter," is a concept used in various scientific and engineering fields, particularly in fluid dynamics, particle transport, and aerosol science. It refers to the diameter of a spherical particle that would exhibit the same settling velocity or drift velocity in a given fluid as a non-spherical particle of interest. Essentially, it's a way to represent the effective size of irregularly shaped particles in a simplified, spherical manner for analytical purposes.

The determination of the mobility diameter is crucial because the motion of particles in fluids is highly dependent on their size and shape. Non-spherical particles, due to their complex geometries, can experience different drag forces and exhibit anisotropic movement compared to spheres. By defining a mobility diameter, researchers can apply established theories and equations originally developed for spherical particles to a broader range of particle shapes. This simplification allows for easier calculation of deposition rates, transport distances, and other dynamic behaviors.

The calculation of the mobility diameter typically involves relating the drag force experienced by the non-spherical particle to the drag force experienced by a sphere of the same mobility diameter under identical flow conditions. Various correction factors and shape factors are employed in these calculations to account for deviations from spherical morphology. The exact method for calculating the mobility diameter can vary depending on the specific application and the type of particle movement being analyzed, such as gravitational settling, electrophoretic mobility, or Brownian motion.