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

LI Chaolong; WEN Jian; WANG Lei; LEI Gang; CHEN Qiang; TU Jiyuan

doi:10.7652/xjtuxb202308005

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

更新时间：2025-05-08

- Non-Isothermal Quantitative Phase Field Simulation Study on the Growth Evolution of Solid-Air Dendritic Microstructure
- Vol. 57, Issue 8, Pages: 46-54(2023)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 航天低温推进剂技术国家重点实验室,北京,100028
  3. 皇家墨尔本理工大学工学院,墨尔本,澳大利亚,3083
  4. 清华大学核能与新能源技术研究院,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202308005
  CLC： TK91
- Online First：10 August 2023，
  
  Published：2023
- 稿件说明：
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LI Chaolong, WEN Jian, WANG Lei, et al. Non-Isothermal Quantitative Phase Field Simulation Study on the Growth Evolution of Solid-Air Dendritic Microstructure[J]. 2023, 57(8): 46-54.
DOI：

LI Chaolong, WEN Jian, WANG Lei, et al. Non-Isothermal Quantitative Phase Field Simulation Study on the Growth Evolution of Solid-Air Dendritic Microstructure[J]. 2023, 57(8): 46-54. DOI： 10.7652/xjtuxb202308005.

摘要

为了探究热-溶质耦合驱动下固空枝晶生长演化和氧溶质分布规律

建立了非等温定量相场模型

应用该模型研究了不同过冷度及边界热流条件下固空枝晶的形态演化、生长速度、氧溶质分布。结果表明:相比等温模拟

考虑凝固潜热的非等温模拟可以更真实再现固空枝晶的生长过程

氧质量分数峰值相比等温模拟减少了8.5%～14.6%; 枝晶的生长速度、最大氧质量分数和初始过冷度呈现正相关性

初始过冷度为4 K时

固液糊状区氧质量分数最大可达到0.401; 边界热流的存在可显著改变计算域温度分布进而影响固空枝晶的生长模式; 热输入减缓了枝晶的生长

而热提取使枝晶臂生长得更为繁盛粗壮

热提取、热输入条件下的固相率分别是无边界热流时的138%、69%

最大氧质量分数分别是无边界热流时的146%、94%。该研究可增进对液氢中固空枝晶生长行为的理解

为液氢系统的安全使用提供一定的理论指导。

Abstract

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.

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