Metal layer molten pool heat transfer characteristic simulation material, preparation method and application

Abstract

The invention discloses a metal layer molten pool heat transfer characteristic simulation material, and a preparation method and application thereof. The metal layer molten pool heat transfer characteristic simulation material comprises metal bismuth and bismuth iodide, and the Pr of the metal layer molten pool heat transfer characteristic simulation material under the condition of 500 DEG C is 0.08-0.12. The preparation process of the metal layer molten pool heat transfer characteristic simulation material comprises the following steps: preparing a bismuth iodide molten salt; heating the metal bismuth until the metal bismuth is completely molten, and continuously heating to a temperature T; slowly adding the prepared bismuth iodide molten salt into the molten metal bismuth for multiple times at the temperature T; and completely melting the bismuth iodide crystals on the surface layer of the metal bismuth to obtain the metal layer molten pool heat transfer characteristic simulation material. The Pr number of the metal layer molten pool heat transfer characteristic simulation material provided by the invention in a working state is 0.08-0.12, is closer to the Prandtl number of a real material; therefore, the real material of the metal layer can be simulated more accurately and reliably, the heat transfer characteristic of the metal layer of the metal layer molten pool in the reactor prototype lower end socket can be reflected more accurately, the uncertainty of the heat transfer relational expression obtained through experiments is effectively reduced, and data support is provided for formulation and implementation of a melt in-reactor retention strategy.

Description

technical field [0001] The invention relates to the technical field of simulating materials for molten pools in the lower head after severe accidents, in particular to materials for simulating heat transfer characteristics of molten pools of metal layers, preparation methods and applications, which can be used for experimental research on the mechanism and mitigation measures of severe reactor accidents. Background technique [0002] When a serious reactor accident occurs, if the core cannot be effectively cooled, it will heat up rapidly and melt to form a molten pool inside the core. With the development of severe accidents, the molten pool inside the core migrates to the side and downward, and finally enters the interior of the lower head. The melt inside the lower head will gradually accumulate to form a molten pool structure, which will continuously transfer decay heat to the wall of the lower head. When the decay heat cannot be fully exported through the wall, the integ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a simulation material, preparation method and application of the heat transfer characteristics of the molten pool of the metal layer, so as to solve the difference between the Prandtl number of the metal layer at high temperature and the Prandtl number and physical properties of the real material in the prior art , resulting in low accuracy and reliability of simulation results, providing reasonable and feasible simulation materials for experimental research on heat transfer characteristics of metal layers in severe accidents