复合泡沫塑料等效导热系数的数值模拟

Numerical Simulation of Effective Thermal Conductivity of Syntactic Foams Based on ANSYS

通过有限元分析软件ANSYS中APDL参数化语言二次开发编程,建立了空心玻璃微球填充酚醛树脂复合泡沫塑料空间随机分布模型。选取代表体积单元进行有限元分析,模拟了不同空心玻璃微球填充量下复合泡沫塑料等效导热系数的变化。研究表明:空心玻璃微球有效阻隔了体系内热流的传递,提高了复合泡沫塑料的隔热性能,随着微球含量的增加,体系的等效导热系数由纯环氧树脂的0.203 W/(m·K)减小到体积分数40%填充量时的0.138 W/(m·K)。引入经典模型和实验数据进行验证,与经典模型相比,有限元分析方法更能准确模拟复合泡沫塑料等效导热系数的实际情况。

The finite element method（FEM）is a powerful computational technique,which is often used to simulate the engineering problems with complex domains subjected to general boundary conditions.The FEM was introduced to determine the effective thermal conductivity（ETC）of particulate filled syntactic foams.A commercially available finite element analysis program ANSYS was successfully employed for this numerical simulation.A 3Drepresentative volume element model was created to investigate the relationship between the ETC and the particular volume fraction.Experimental work and other theoretical analysis models were introduced in order to validate this numerical simulation model.