New weight factor for Brownian force exerted on micro/nano-particles in air flow

Abstract

In order to effectively describe the effect of Brownian force exerted on the micro/nano-particles in air flow, a new weight factor, which is defined as the ratio of the characteristic velocity of the Brownian motion to the macroscopic velocity, is proposed and applied to the particle settlement under gravity. Results show that the weight factor can quantitatively evaluate the effect of Brownian force on the particle motion. Moreover, the value of the weight factor can also be used to judge the particle motion pattern and determine whether the Brownian force should be taken into account.

The transport phenomenon of inertia Brownian particles in a periodic potential with non-Gaussian noise

“…14 As known, directed motion controllability has become a focal point of research in nonequilibrium statistical physics which inspired a plethora of new microscale devices displaying unusual transport features. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] Most studies on noise induced particles transport phenomenon assumed that the noise source has a Gaussian distribution (either white or colored), and ignored the inertia term of the particle. However, some experimental results offer strong indications that the noise source could be non-Gaussian.…”