遮光剂掺杂SiO_(2)气凝胶传热的统一格子Boltzmann模型研究  

A unified lattice Boltzmann model for heat transfer in opacifiers-doped silica aerogel

作　　者：范坤阳 杨景兴[2] 许海波 连兴容 何凤梅[2] 陈聪慧[2] 李增耀 FAN Kunyang;YANG Jingxing;XU Haibo;LIAN Xingrong;HE Fengmei;CHEN Conghui;LI Zengyao(School of Energy and Power Engineering,Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;Institute of Aerospace Materials and Technology,Beijing 100076,China)

机构地区：[1]西安交通大学能源与动力工程学院,热流科学与工程教育部重点实验室,陕西西安710049 [2]航天材料及工艺研究所,北京100076

出　　处：《化工学报》2023年第5期1974-1981,共8页CIESC Journal

基　　金：国家自然科学基金创新研究群体科学基金项目(51721004)。

摘　　要：气凝胶是一种纳米多孔超级隔热材料,其内部的传热过程涉及气相导热、固相导热、气固耦合传热及辐射传热。基于格子Boltzmann方法,演化了含有辐射源项的能量方程和辐射传输方程,建立了描述SiO_(2)气凝胶复合材料内多模式多尺度耦合传热的统一格子Boltzmann模型,探究了SiC遮光剂粒径和掺杂量对气凝胶复合材料隔热性能的影响,获得了使得材料等效热导率最小的SiC遮光剂最优粒径和最佳掺杂量随温度的变化规律。Aerogel is a nanoporous super-insulation material,and its internal heat transfer process involves gas-phase heat conduction,solid-phase heat conduction,gas-solid coupling heat transfer and radiation heat transfer.In the present study,the energy equation containing the radiation source and the radiation transfer equation are derived based on the lattice Boltzmann method(LBM),and a unified lattice Boltzmann model to describe multi-mode and multi-scale coupled heat transfer in SiO_(2)aerogel composites is established.The effects of diameter and doping volume fraction of SiC opacifiers on the thermal insulation performance of SiO_(2)aerogel composites are investigated.The temperature-dependent optimal diameter and doping volume fraction of SiC opacifiers are obtained to minimize the effective thermal conductivity of SiC-doped silica aerogel composites.

关 键 词：SiO_(2)气凝胶 耦合传热 统一格子Boltzmann模型 遮光剂 等效热导率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]