聚酰亚胺泡沫的制备及热物性能研究  

Preparation and thermal properties of polyimide foam

作　　者：张澧桐 孙立强 张瑞涵 王佰超 张洪明 ZHANG Litong;SUN Liqiang;ZHANG Ruihan;WANG Baichao;ZHANG Hongming(School of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun 130022,China;Inner Mongolia University,Hohhot 010021,China;Inner Mongolia First Machinery Group Co.,Ltd.,Baotou 010021,China)

机构地区：[1]长春理工大学机电工程学院,长春130022 [2]内蒙古大学,呼和浩特010021 [3]内蒙古第一机械制造有限公司,内蒙古包头014000

出　　处：《功能材料》2025年第2期2179-2185,共7页Journal of Functional Materials

基　　金：吉林省教育厅基金项目(JJKH20220732KJ)。

摘　　要：采用发泡法制备了聚酰亚胺泡沫,通过实验和数值模拟研究了自然对流条件下孔隙率和孔隙分布对聚酰亚胺泡沫热物性能的影响。定义了非均质系数Ψ来评价泡沫内部的孔隙分布情况。制备了不同孔隙率和非均质的聚酰亚胺泡沫。通过实验测量了聚酰亚胺泡沫的自然对流换热系数。将Voronoi技术与双尺度生成法相结合,建立了多孔模型,并进行了传热数值模拟。仿真结果与实验结果吻合较好。结果表明,在非均质系数固定的情况下,随着孔隙率的增加,泡沫的传热性能显著降低;在孔隙率固定的情况下,泡沫的传热性能随着非均质系数的增加而显著提高。通过数值模拟结果,可以观察到内部温度场和流场分布。孔隙率和非均质系数对自然对流换热性能的影响主要是由内部渗透率的变化引起的。Polyimide foam was prepared by foaming method.The effects of porosity and pore distribution on the properties of polyimide foam under natural convection were investigated experimentally and numerically.The heterogeneous factor Ψ was defined to evaluate the pore distribution inside the foam.Polyimide foams with different porosity and heterogeneous were prepared.The natural convection heat transfer coefficient of polyimide foam was measured experimentally.By combining Voronoi technique with double-scale generation method,the porous model was established and the heat transfer numerical simulation was carried out.The simulation results agreed well with the experimental results.The results show that under the condition of fixed heterogeneity,the heat transfer performance of foam decreased significantly with the increase of porosity.In the case of fixed porosity,the heat transfer performance of the foam increased significantly with the increase of heterogeneity.The distribution of internal temperature field and flow field can be observed by numerical simulation results.The influence of porosity and heterogeneity on natural convection heat transfer performance was mainly caused by the change of internal permeability.

关 键 词：聚酰亚胺泡沫 对流传热 VORONOI图 非均质系数 

分 类 号：TB324[一般工业技术—材料科学与工程]