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1、第49卷第1期南京航空航天大学学报Vol.49No.12017年2月JournalofNanjingUniversityofAeronautics&AstronauticsFeb.2017DOI:10.16356/j.1005-2615.2017.01.002基于Lattice-Boltzmann方法的多孔介质真空绝热特性阚安康1,21212吴亦农徐志峰张安阔王为(1.中国科学院上海技术物理研究所,上海,200083;2.上海海事大学商船学院,上海,201306)摘要:作为真空绝热板的芯材,多孔介质微尺度空间形貌结构及物性参数
2、对其绝热性能影响较大。为研究多孔介质真空下的导热性能,选择颗粒状、纤维状和泡沫状3种典型多孔介质材料,并基于Lattice-Boltzmann(LBM)提出了一种随机构造多孔介质物理模型的方法。模型中重要参数结合多孔介质电镜扫描图像处理获取。采用D3Q15LBM模型进行数值模拟,并分析了真空度及颗粒/纤维/泡孔等效直径对导热系数的影响规律。模拟与实验的对比结果揭示了多孔介质真空下的导热系数随真空度及多孔介质物性参数的变化规律。关键词:真空绝热板;多孔介质材料;Lattice-Boltzmann方法;导热系数;真空度中图分类号:
3、TK121文献标志码:A文章编号:1005-2615(2017)01-0017-07VacuumThermalInsulationPropertyAnalysisofPorousMaterialsBasedonLattice-BoltzmannMethod1,2,WUYinong1,XUZhifeng2,ZHANGAnkuo1,WANGWei2KANAnkang(1.ShanghaiInstituteofTechnicalPhysics,ChineseAcademyofScience,Shanghai,200083,China
4、;2.MerchantMarineCollege,ShanghaiMaritimeUniversity,Shanghai,201306,China)Abstract:Asthecorematerialofthevacuuminsulationpanel,microstructureandphysicalpropertiesofporousmaterialshavegreatinfluenceonthethermalinsulationperformance.Tostudythethermalcon-ductivityofpor
5、ousmaterialundervacuumcondition,threetypicalporousmaterials,thatis,granular,fibrousandfoamymaterialsareinvolvedinthispaper,andaphysicalmodelbasedontheLattice-Boltz-mannmethod(LBM)isproposed.Thekeyparametersofthemodelareobtainedbyscanningelectronmicroscopeimagefromre
6、alporousmaterials.Numericalsimulationandanalysisaremadetostudytheinfluenceofthevacuumdegreeandtheequivalentdiameteroftheparticles/fiber/cellholeversusthermalconductivitybyD3Q15modelbasedonLBM.Comparisonofsimulationandexperimentalresultsex-plorestheprinciplesofthethe
7、rmalconductivityvariationversusphysicalpropertiesandvacuumdegree.Theworkissignificanttooptimizethestructureofcorematerialsandtoimprovetheaccuracyofeffec-tivethermalconductivityprediction.Keywords:vacuuminsulationpanel;porousmaterial;Lattice-Boltzmannmethod;thermalco
8、nductiv-ity;vacuumdegree真空绝热板(Vacuuminsulationpanel,VIP)VIP具有优良的绝热性能,同等厚度下,其热阻是以其导热系数极低、质轻、厚度小等诸多优点,而被诸如聚氨酯、聚苯乙烯、玻璃纤维毡等常规保温材[1-6][1]广泛应用于家
