Particles being held in suspension by Brownian motion

Particles being held in suspension by Brownian motion 

For a particle of mass m. Brownian motion, which consists in random molecular stirring of the particle due to the temperature of the medittm, is characterized by a kinetic energy that increases with medium temperature  

6 Surfaetant effects are discussed in the review paper by Magnaudet and Fames, The motion of high-Reynolds number bubbles in homogeneous flows , Rev. Fluid Meek, Vol. 32, pp. 659-708 2000. 

This quantity is the average kinetic energy of a particle selected from a set of particles, as indieated by the bar over the squared velocity. T is the absolute temperature and = 1.38 x 10 J K is Boltzmann s constant. 

Brownian motion disperses the particles. In [15.14], 3c(i) designates the instantaneous displacement of a particle from an original positioa These displacements are governed by the fundamental law of dynamics. The forces applied to the particle are the thermal agitation force of the Brownian motion and the friction force exerted by the flow, which opposes the relative movement of the particle with respect to the fluid. We therefore write  

---