Mesoscopic scale research method for equivalent heat conductivity coefficient of multiphase composite material

Abstract

The invention relates to a mesoscopic scale research method of an equivalent heat conductivity coefficient of a multiphase composite material. Aiming at the heterogeneous characteristic of the composite material and aiming at the most common material-soil body in geotechnical engineering from the microcosmic scale perspective, a numerical model is established based on a finite element method so asto estimate the equivalent heat conductivity coefficient of the composite material. The established numerical model performs simulation through a Monte Carlo algorithm;to obtain a soil body structurewith spatial randomness, comparative analysis is performed on equivalent heat conductivity coefficients of a soil body under three conditions by combining a finite element calculation method and a Fourier formula based on steady-state analysis, and the influence of factors such as soil body type, porosity, saturation, spatial arrangement of a dispersed phase and the like on the equivalent heat conductivity coefficients of the soil body is explored. Starting from the mesoscopic scale, the invention provides the method capable of simulating the heterogeneity of the internal structure of the multi-phase composite material, a new thought is provided for analyzing the heat conduction characteristic of the multi-phase composite material, and the simulation method is simple, feasible, rapid andconvenient.

Description

technical field [0001] The invention belongs to the field of research on properties of multiphase composite materials, and in particular relates to a mesoscale research method of equivalent thermal conductivity of multiphase composite materials. Background technique [0002] Many materials in geotechnical engineering are considered as multiphase composite materials. For example, soil is usually regarded as a multiphase system consisting of soil skeleton, air, water and ice. Geotechnical materials play an important role in environmental and engineering applications, and their thermal properties are one of the most critical parameters of geotechnical materials. Thermal conductivity, convective heat transfer coefficient and specific heat capacity are the main factors affecting the thermal behavior of soil, among which thermal conductivity is the most critical parameter reflecting heat transfer capability, which has important applications in geothermal energy development and und...

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Problems solved by technology

This method only needs to determine the input parameters of the formula to obtain the equivalent thermal conductivity, which is beneficial to the estimation of the properties of various materials, but this prediction method is largely affected by the physical model, and can only be used as a practical project. An easy way to make predictions

[0008] Multiphase materials have strong heterogeneity and are affected by many factors at the same time, so the determination of the thermal conductivity of multiphase composite materials is more complicated

However, none of the above methods can independently explore the influence of a single factor on the equivalent thermal conductivity of multiphase composites.

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