Method for measuring thermophysical property of columnar thermal insulation material

Abstract

The invention provides a method for measuring thermophysical property of a columnar thermal insulation material, which is used for determining radial heat conductivity, axial heat conductivity and volume heat capacity of the columnar orthotropic thermal insulation material by measuring temperature variation of one point of a tested sample. The method comprises the following steps: establishing a two-dimension cylindrical coordinate heat transfer model under effect of thermal interference of specific form in cylindrical coordinates; obtaining analytical solution of temperature variation of the orthotropic thermal insulation material in the time domain by adopting Laplace transformation, Hankel transformation and Laplace inverse transformation; analyzing correlation among sensitivity coefficients of the radial heat conductivity, the axial heat conductivity and the volume heat capacity and the influences of temperature variation caused by the parameters through calculation on the sensitivity; establishing a corresponding measurement system, and acquiring the transient response data of the temperature in real time; and meanwhile, determining the radial heat conductivity, the axial heat conductivity and the volume heat capacity of the tested orthotropic thermal insulation material by adopting an L-M parameter estimation method. The method provided by the invention is convenient to implement and adopts simple steps, and meanwhile can be used for measuring the radial heat conductivity, the axial heat conductivity and the volume heat capacity of the columnar thermal insulation material.

Description

technical field [0001] The invention belongs to the technical field of thermal physical property measurement of materials, in particular, it provides a new measurement method which can simultaneously obtain multiple thermal physical property parameters through one measurement, and determines the orthotropic anisotropy by measuring the temperature change of a point in the measured sample Methods for radial thermal conductivity, axial thermal conductivity, and volumetric heat capacity of insulating materials. Background technique [0002] The thermophysical parameters of materials are one of the most basic physical parameters to understand, understand and evaluate the heat transfer performance of materials, and are the key parameters for basic research, analysis calculation and engineering design of specific heat transfer processes. Accurate measurement of thermophysical parameters is of great significance to the development of many fields such as energy utilization, building ...

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Problems solved by technology

However, the existing mature thermal conductivity measurement methods such as hot-line method, hot-wire method, hot-disk, etc., are all based on the principle model of isotropic materials, which are not suitable for the measurement of thermal conductivity of fiber m...

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