# Numerical Investigation of Mixing Performance in Microfluidic Chip via Structural Micro-Rotors

## TL;DR

This paper uses computer simulations to study how different rotor shapes and arrangements improve mixing in microfluidic chips.

## Contribution

The study introduces a numerical investigation of various rotor shapes and their arrangements for enhancing mixing in microfluidic systems.

## Key findings

- Bar-shaped, Y-shaped, and cross-shaped rotors were analyzed for their mixing performance.
- Multiple cross-rotors and rotation rates significantly influence mixing efficiency.
- Findings can guide the design of rotors for better in-channel mixing.

## Abstract

Microfluidics is a powerful tool with extensive applications, including chemical synthesis and biological detection. However, the limited channel size and high viscosity of samples/reagents make it difficult to fully mix liquids and improve the reaction efficiency inside microfluidic chips. Active mixing by rotors has been proven to be an effective method to promote mixing efficiency via a magnetic field. Here, we numerically investigated the mixing performance of rotors with different shapes (bar-shaped, Y-shaped, and cross-shaped). We systematically studied the influence of the arrangement of multiple cross-rotors and the rotation rate on mixing performance. The results are promising for instructing the design and manipulation of rotors for in-channel mixing.