THERMAL SCIENCE

International Scientific Journal

Mingwei Tian

,

Ning Pan

,

Lijun Qu

,

Xiaoqing Guo

,

Guangting Han

A THEORETICAL ANALYSIS OF LOCAL THERMAL EQUILIBRIUM IN FIBROUS MATERIALS

ABSTRACT
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.
KEYWORDS
porous fibrous media, local thermal equilibrium, boundary conditions, material property and structure.
PAPER SUBMITTED: 2012-06-07
PAPER REVISED: 2013-01-07
PAPER ACCEPTED: 2013-03-05
PUBLISHED ONLINE: 2013-04-13
DOI REFERENCE: https://doi.org/10.2298/TSCI120607018T
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Issue 1, PAGES [69 - 82]
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A theoretical analysis of local thermal equilibrium in fibrous materials

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