Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method

doi:10.7652/xjtuxb202105018

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Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method

更新时间：2025-07-09

- Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method
- Vol. 55, Issue 5, Pages: 162-170(2021)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202105018
  CLC： TB126
- Online First：10 May 2021，
  
  Published：2021
- 稿件说明：
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Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method[J]. 2021, 55(5): 162-170.
DOI：

Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method[J]. 2021, 55(5): 162-170. DOI： 10.7652/xjtuxb202105018.

摘要

采用无网格移动粒子半隐式法

结合充分发展速度进口模型以及移动边界模型

数值模拟了Y型双进口带叶片主动式微混合器的内部流动。提出了一种基于位置判断的高效斜置连续进口模型

基于粒子法全拉格朗日特性

定义了一种可描述理想有序混合的局部混合率计算方法

并通过分析确定了关键参数数值。内流流场数值分析结果表明

对于不互溶两液体的连续混合

混合主要发生在混合室内的逆流区域

且由于进口液体的持续流动、叶片旋转以及混合器几何形状的多重耦合作用

出口通道处的混合率产生周期性波动。本文揭示了一个稳态周期内两种液体完整的掺混及输运过程

并研究了进口流速与叶片转速对混合率的影响

发现在本文研究的参数范围内

适当减小进口流速或增大叶片转速都可提升混合率

但过小的进口流速会使混合率下降。

Abstract

The flow field of a Y-type active micromixer with an impeller and two inlets is numerically simulated using moving the particle semi-implicit method

in which the fully developed velocity inlet model and the moving boundary model are combined. A high efficiency inclined continuous inlet model based on position judgment is proposed. A local mixing rate calculation method

which can describe ideal ordered mixing

is defined

and the key parameters of this method are determined through numerical experiments. Simulation of the flow field shows that for the continuous mixing of two immiscible liquids

the mixing mainly happens in the counter current region of the chamber. The mixing index at the outlet channel fluctuates periodically due to the multiple effects of continuous inflow

rotation of blade

and geometry of this mixer. This paper reveals the mixing mechanism and the transportation process in a steady-state period

and studies the influences of inlet velocity and rotating speed on mixing index. It is found that the mixing index can be improved by properly reducing the inlet flow rate or increasing the rotating speed

but the mixing degree will decrease if the inlet flow rate is too small.

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references

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