Particle-Size Effects on the Enhanced Diffusion of Tracer Particles in Microswimmer Suspensions
Active suspensions of microswimmers such as bacteria or microalgae are found in oceans or lakes, and within living organisms, such as the human body. These suspensions can exhibit complex flow patterns and enhanced diffusion of passive tracer particles due to the advection from the long-ranged dipolar flow fields of the swimmers. The diffusion of tracers at varying radii is poorly understood but o