CIESC Journal ›› 2023, Vol. 74 ›› Issue (5): 1974-1981.DOI: 10.11949/0438-1157.20221612

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

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

Kunyang FAN1(), Jingxing YANG2, Haibo XU1, Xingrong LIAN1, Fengmei HE2, Conghui CHEN2, Zengyao LI1()   

  1. 1.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
    2.Institute of Aerospace Materials and Technology, Beijing 100076, China
  • Received:2022-12-13 Revised:2023-05-10 Online:2023-06-29 Published:2023-05-05
  • Contact: Zengyao LI

遮光剂掺杂SiO2气凝胶传热的统一格子Boltzmann模型研究

范坤阳1(), 杨景兴2, 许海波1, 连兴容1, 何凤梅2, 陈聪慧2, 李增耀1()   

  1. 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
  • 通讯作者: 李增耀
  • 作者简介:范坤阳(1998—),男,硕士研究生,17803905225@163.com
  • 基金资助:
    国家自然科学基金创新研究群体科学基金项目(51721004)

Abstract:

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 SiO2 aerogel composites is established. The effects of diameter and doping volume fraction of SiC opacifiers on the thermal insulation performance of SiO2 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.

Key words: SiO2 aerogel, coupled heat transfer, unified lattice Boltzmann model, opacifiers, equivalent thermal conductivity

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SiO2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。

关键词: SiO2气凝胶, 耦合传热, 统一格子Boltzmann模型, 遮光剂, 等效热导率

CLC Number: