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Non-Isothermal Quantitative Phase Field Simulation Study on the Growth Evolution of Solid-Air Dendritic Microstructure

journal contribution
posted on 2024-11-03, 10:12 authored by Chaolong Li, Jian Wen, Lei Wang, Gang Lei, Qiang Chen, Jiyuan TuJiyuan Tu
The solid-air accumulated in liquid hydrogen has certain safety hazards. In order to investigate the growth evolution and oxygen solute distribution of solid-air dendrite driven by heat-solute coupling, a non-isothermal quantitative phase field dendrite growth model is established in this paper, which is applied to study the morphological evolution, growth rate and oxygen solute distribution of solid-air dendrites under different subcooling degrees and boundary heat flux conditions. The results show that: compared with isothermal simulation, the non-isothermal simulation considering latent heat of solidification can reproduce the growth process of solid-air dendrites more realistically, and the peak oxygen mass fraction is reduced by 8.5%-14.6% compared with isothermal simulation; the growth rate of dendrites and the maximum oxygen mass fraction show a positive correlation with the initial subcooling degree, and the maximum oxygen mass fraction in the solid-liquid interphase zone can reach 0.401 when the initial subcooling degree is 4 K; the presence of boundary heat flux can significantly change the temperature distribution in the computational domain and thus affects the growth pattern of solid-air dendrites; heat input slows down the growth of dendrites, while heat extraction makes the dendrite arms grow more prosperous and robust, and the solid fraction under heat extraction and heat input conditions are 138% and 69% of those without boundary heat flux, and the maximum oxygen mass fractions are 146% and 94% of those without boundary heat flux, respectively. This study improves the understanding of the solid-air dendrite growth behavior in liquid hydrogen and may provide theoretical guidance for the safe use of liquid hydrogen systems.

History

Journal

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University

Volume

57

Issue

8

Start page

46

End page

54

Total pages

9

Publisher

Xi'an Jiaotong University

Place published

China

Language

English

Former Identifier

2006126072

Esploro creation date

2023-10-16

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