气凝胶及其纤维复合材料等效导热系数预测

方文振; 粘权鑫; 张虎; 陈黎; 陶文铨

doi:10.7652/xjtuxb201507005

您当前的位置：

首页 >

文章列表页 >

气凝胶及其纤维复合材料等效导热系数预测

更新时间：2025-07-09

- 气凝胶及其纤维复合材料等效导热系数预测
- Prediction of the Effective Thermal Conductivity of Aerogel and Its Fiber-Loaded Composites
- 西安交通大学学报 2015年49卷第7期页码：25-29
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
  
  : 2015-01-31。作者简介: 方文振(1990—),男,博士生;陶文铨(通信作者),男,教授,博士生导师,中国科学院院士。基金项目: 国际合作重点基金资助项目(51320105004)
- DOI：10.7652/xjtuxb201507005
  中图分类号： TK311
- 网络首发：2015-07-10，
  
  纸质出版：2015
- 稿件说明：
移动端阅览
方文振, 粘权鑫, 张虎, 等. 气凝胶及其纤维复合材料等效导热系数预测[J]. 西安交通大学学报, 2015,49(7):25-29.

Prediction of the Effective Thermal Conductivity of Aerogel and Its Fiber-Loaded Composites[J]. 2015, 49(7): 25-29.
方文振, 粘权鑫, 张虎, 等. 气凝胶及其纤维复合材料等效导热系数预测[J]. 西安交通大学学报, 2015,49(7):25-29. DOI： 10.7652/xjtuxb201507005.

Prediction of the Effective Thermal Conductivity of Aerogel and Its Fiber-Loaded Composites[J]. 2015, 49(7): 25-29. DOI： 10.7652/xjtuxb201507005.

摘要

为了研究气凝胶及其纤维复合材料的隔热性能

分别数值重构了几种气凝胶及其纤维复合材料的微细观随机结构

采用格子Boltzmann方法数值求解了它们的等效导热系数

同时用基于瞬态平面热源法的Hot Disk热常数分析仪测量了它们在复杂环境下的等效导热系数。研究表明:骨架连续的开孔型微观结构比骨架不连续的颗粒型微观结构更符合气凝胶的实际结构

开孔型结构等效导热系数的数值预测值与实验值的偏差大部分在±10%内; 气凝胶的密度值会影响它的隔热性能

且存在着最佳的密度使得气凝胶的等效导热系数最低; 纤维复合气凝胶的等效导热系数随着纤维体积分数的增加而增加; 纤维在垂直于热流方向的水平面内随机排布时对气凝胶的隔热性能影响最小。

Abstract

Different random microstructures of aerogels and their fiber-loaded composites were numerically reconstructed to investigate their insulation performances. The lattice Boltzmann method was adopted to calculate their effective thermal conductivities. Some experimental measurements based on the hot disk method were conducted to determine the effective thermal conductivities of the aerogels at different pressures. The results show that: the open-cell microstructure with continuous skeleton is more suitable for the real structure of the aerogel than the granular microstructure with discontinuous skeleton; the predictions of the effective thermal conductivities based on the open-cell structure agree well with the experimental data

and the deviations are within ±10%; the density of aerogels affects their effective thermal conductivities

and there exists an optimal density value to minimize the effective thermal conductivity of a aerogel; the effective thermal conductivities of the aerogel composites increase with the fiber doping concentration; the increment of the effective thermal conductivity of the fiber-load aerogel is the lowest when the fibers are laid in the plane vertical to heat flux.

关键词

Keywords

references

HÜSING N, SCHUBERT U. Aerogels-airy materials: chemistry, structure, and properties [J]. Angewandte Chemie: International Edition, 1998, 37(12): 22-45.

ZENG S Q, HUNT A, GREIF R. Geometric structure and thermal conductivity of porous medium silica aerogel [J]. Journal of Heat Transfer, 1995, 117(4): 271-277.

XIE T, HE Y L, HU Z J. Theoretical study on thermal conductivities of silica aerogel composite insulating material [J]. International Journal of Heat and Mass Transfer, 2013, 58(1/2): 540-552.

WEI G S, LIU Y, ZHANG X, et al. Thermal conductivities study on silica aerogel and its composite insulation materials [J]. International Journal of Heat and Mass Transfer, 2011, 54(11/12): 2355-2366.

DAN D, ZHANG H, TAO W Q. Effective structure of aerogels and decomposed contributions of its thermal conductivity [J]. Applied Thermal Engineering, 2014, 72(1): 2-9.

LU G, WANG X D, DUAN Y Y, et al. Effects of non-ideal structures and high temperatures on the insulation properties of aerogel-based composite materials [J]. Journal of Non-Crystalline Solids, 2011, 357(22/23): 3822-3829.[7] ZHAO J J, DUAN Y Y, WANG X D, et al. Radi-ative properties and heat transfer characteristics of fiber-loaded silica aerogel composites for thermal insulation [J]. International Journal of Heat and Mass Transfer, 2012, 55(19/20): 5196-5204.

International Organization for Standardization. ISO 22007-2: 2008(E)Plastics: determination of thermal conductivity and thermal diffusivity Part 2 Transient plane heat source method [S/OL]. [2014-12-10]. http: ∥www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=40683.

WANG M, WANG J, PAN N, et al. Mesoscopic predictions of the effective thermal conductivity for microscale random porous media [J]. Physical Review: E, 2007, 75(3): 036702.

WANG M, PAN N. Modeling and prediction of the effective thermal conductivity of random open-cell porous foams [J]. International Journal of Heat and Mass Transfer, 2008, 51(5/6): 1325-1331.

WANG M, KANG Q, PAN N. Thermal conductivity enhancement of carbon fiber composites [J]. Applied Thermal Engineering, 2009, 29(2/3): 418-421.

XUAN Y M, ZHAO K, LI Q. Investigation on mass diffusion process in porous media based on Lattice Boltzmann method [J]. Heat and Mass Transfer, 2010, 46(10): 1039-1051.

HE Y L, WANG Y, LI Q. Lattice Boltzmann method: theory and applications [M]. Beijing, China: Science Press, 2009.

MOHAMOD A A. Lattice Boltzmann method [M]. New York, USA: Springer, 2011.

ZENG S Q, HUNT A, GREIF R. Mean free path and apparent thermal conductivity of a gas in a porous medium [J]. Journal of Heat Transfer, 1995, 117(3): 758-761.

WANG M R, WANG X, WANG J, et al. Grain size effects on effective thermal conductivity of porous materials with internal thermal contact resistance [J]. Journal of Porous Media, 2013, 16(11): 1043-1048.

方文振, 张虎, 屈肖迪, 等. 遮光剂对气凝胶复合材料隔热性能的影响 [J]. 化工学报, 2014, 65(S1): 168-174.

FANG Wenzhen, ZHANG Hu, QU Xiaodi, et al. Influence of opacifiers on thermal insulation properties of composite aerogels [J]. CIESC Journal, 2014, 65(S1): 168-174.

浏览量

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

低成本高导电的高温热电应用石墨气凝胶研究

沸腾过程的格子Boltzmann方法模拟

有限体积法与LBM分区耦合模拟方腔自然对流

液桥重开过程的两相格子Boltzmann模型及计算

冷库水平空气幕热湿阻隔性能数值模拟研究