Method for measuring thermal conductivity dynamic change of composite phase-change material

The invention provides a method for measuring the thermal conductivity dynamic change of a composite phase change material, and belongs to the technical field of material thermophysical property measurement. The method comprises the following steps: firstly, establishing a one-dimensional heat transfer model of a measured sample in a rectangular coordinate system under the action of specific-form thermal interference; adopting an apparent heat capacity method, a full-implicit finite difference discrete format discrete equation method and a chasing method to obtain a numerical solution of temperature change in the composite phase change material in a time domain; analyzing the linear correlation of the sensitivity coefficients of the relevant parameters a, b, c and d of the heat conductivity along with the change of the liquid phase rate and the influence of the parameters on the temperature change through sensitivity calculation; establishing an experimental measurement system, and acquiring transient respons