TY - JOUR
TI - A theoretical analysis of local thermal equilibrium in fibrous materials
AU - Tian Mingwei
AU - Pan Ning
AU - Qu Lijun
AU - Guo Xiaoqing
AU - Han Guangting
JN - Thermal Science
PY - 2015
VL - 19
IS - 1
SP - 69
EP - 82
PT - Article
AB - The internal heat exchange between each phase and the Local Thermal  Equilibrium (LTE) scenarios in multi-phase fibrous materials are considered  in this paper. Based on the two-phase heat transfer model, a criterion is  proposed to evaluate the LTE condition, using derived characteristic  parameters. Furthermore, the LTE situations in isothermal/adiabatic boundary  cases with two different heat sources (constant heat flux and constant  temperature) are assessed as special transient cases to test the proposed  criterion system, and the influence of such different cases on their LTE  status are elucidated. In addition, it is demonstrated that even the  convective boundary problems can be generally estimated using this approach.  Finally, effects on LTE of the material properties (thermal conductivity,  volumetric heat capacity of each phase, sample porosity and pore hydraulic  radius) are investigated, illustrated and discussed in our study.