微流控视觉伪装系统实验设计及流动特性分析

Experimental Design of Microfluidic Visual Camouflage System and Its Flow Characteristics Analysis

自然界中变色龙能够根据背景颜色的变化实时改变皮肤颜色,实现自适应伪装。提出了一种利用微流控视觉伪装系统控制有色液体在伪装薄膜的微流道内循环以实现动态伪装的变色龙皮肤模拟实验。对采用非线性、超弹性材料的伪装薄膜进行了静态力学特性实验。选择适当的应变能密度函数拟合实验数据,得到合理的模型参数。通过单、双向流固耦合仿真模型比较微流控视觉伪装系统的液体流动特性以及流量对压力、速度分布的影响,并通过实验验证微流道内液体流动压力损失特性仿真结果,从而确定系统功率,为微流控视觉伪装系统设计提供可靠依据。微流控视觉伪装系统实验及对微流道内液体的仿真分析有效拓展了传统实验教学内容及方法。

An innovative experiment has been proposed to simulate chameleon skin by using a microfluidic visual camouflage system that controls the circulation of colored liquids in the microchannels of a camouflage film to achieve dynamic camouflage.For the camouflage film,nonlinear,hyperelastic materials are prepared,and static mechanical property tests are conducted.Appropriate strain energy density functions are selected to fit the experimental data and obtain reasonable model parameters.Single and bidirectional fluid-structure interaction simulation models are used to compare the liquid flow characteristics of the microfluidic visual camouflage system and the effects of flow rate on pressure and velocity distributions.Experimental tests are conducted to verify the simulation results of liquid flow pressure loss within the microchannels,determine the system’s power and provide a reliable basis for designing the microfluidic visual camouflage system.The experiment and simulation analysis of liquid flow in the microchannels effectively expands traditional experimental teaching scenarios and diversifies the forms of experimental teaching.