An improved Dissipative Particle Dynamics Method for the Liquid-Particle Two-Phase Flow in Microchannels

Abstract

Abstract Liquid-particle two-phase flow in microchannels is widely applicable in the microfluidic fields. The standard dissipative particle dynamics (DPD) method has been previously employed to study the liquid-particle two-phase flow in microchannels. However, the standard method cannot accurately simulate the real two-phase flow in microchannel. In the present study, by changing the energy unit and fitting the characteristic curve between the random force coefficient and the Schmidt number, the value of the Schmidt number is modified to be 355, which can be used to accurately simulate the flow process of the real fluid. In addition, a new logarithmic relationship between the conservative force coefficient and the radius of the particle is established. The simulation results of the particle migration are in good agreement with the Matas theory with an error of 1.5%. The improved DPD method would be of great help for the microfluidic applications and the research on the mechanism of multiphase flow in micro scale.