Micro-channels with built-in shape memory alloys (SMAs) can respond intelligently to channel temperature variations without applying an external force and control the flow rate. In this work, a 2D micro-channel with a shape memory alloy (SMA) valve is designed and studied using fluid–structure interaction (FSI) conditions. The behavior of the SMA valve, which includes bending under the effect of force loading and inlet fluid pressure, and the recovery of the shape of the valve, has been investigated in this study. The temperature at which the valve is completely recovered and the output fluid reaches the lowest value is called the closing temperature. This research investigates the impact of different geometrical and functional parameters on closing temperature, such as fluid inlet pressure and velocity, channel height and valve thickness. The outlet fluid flow rate of the SMA micro-channel is evaluated by employing a relevant constitutive equation to model the SMA valve behavior and implement it in Finite Element Method (FEM) multiphysics frameworks. The results show that the outlet flow rate relies on the shape recovery of the SMA valve and the fluid velocity field in the FSI simulations.

内置形状记忆合金（SMA）的微通道可以智能地响应通道温度变化，而无需施加外力并控制流量。在这项工作中，使用流固相互作用 (FSI) 条件设计和研究了带有形状记忆合金 (SMA) 阀的 2D 微通道。本研究研究了 SMA 阀门的行为，包括在力载荷和入口流体压力作用下的弯曲，以及阀门形状的恢复。阀门完全恢复且输出流体达到最低值时的温度称为关闭温度。本研究研究了不同几何和功能参数对关闭温度的影响，例如流体入口压力和速度、通道高度和阀门厚度。通过采用相关本构方程对 SMA 阀门行为进行建模并在有限元法 (FEM) 多物理场框架中实施，评估 SMA 微通道的出口流体流速。结果表明，出口流量取决于 SMA 阀的形状恢复和 FSI 模拟中的流体速度场。