Resistance characteristics analysis of droplet logic gate based on lattice Boltzmann method

摘要

In this paper, the geometric models of microfluidics NON-AND and AND-OR droplet logic gate devices are designed, and the operations of NON-AND and AND-OR logic are implemented in the designed models. Based on the color-gradient model (R-K model) of lattice Boltzmann method (LBM), the two-phase flow pattern in microchannel is simulated. Based on the "equivalent length method", the Laplace resistance at the droplet phase interface and the local resistance at the right-angle bend are equivalent to the additional pipe length required for continuous phase flow in the channel to generate the same on-way resistance increment, and the resistance characteristics when slug flow droplets exist in the microchannel are quantitatively analyzed. The method is further applied to the analysis of the resistance characteristics of the droplet logic gate, and the quantitative explanation of the droplet path-choosing behavior is obtained. Compared with the "hydroelectricity analogism method", the "equivalent length method" is more concise and easy to understand. The research results in this paper provide theoretical basis for the design of other forms of droplet logic gate devices. (C) 2020 Elsevier Masson SAS. All rights reserved.