从局部干涸到对流伸长的蒸汽结构：矩形微通道内沸腾转变的雷诺数效应
From localized dryout to convective elongated vapor structures: Reynolds number effects on boiling transition in a rectangular mini-channel
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- Harbin Institute of Technology（哈尔滨工业大学）
- Suzhou Research Institute of HIT（哈尔滨工业大学苏州研究院）
- Union College（联合学院）
- Universidad de Sevilla（塞维利亚大学）
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中文总结 AI 辅助
通过三维共轭模拟，采用含物理信息多位点核化模型的开源数值框架，明确矩形微通道内沸腾转变的雷诺数效应，发现低、高雷诺数下不同转变路径，且Re=2000时热响应最优。
中文摘要 AI 辅助
本研究开展三维共轭模拟，探究矩形微通道内的饱和流动沸腾，重点关注入口雷诺数对沸腾模式选择及转变的作用。研究采用基于C++的开源数值框架，该框架结合了核化位点密度关联式与基于Halton序列的空间分配策略，融入了物理信息驱动的多位点核化模型。研究识别出两条不同的、依赖雷诺数的转变路径：低雷诺数下，沸腾转变主要与局部干涸发展相关，该发展与上游活跃沸腾及下游逐步的液体匮乏有关；高雷诺数下，转变的特征是蒸汽结构的对流拉伸与重组，在此过程中，伸长的蒸汽弹演化为局部蒸汽膜，最终接近完全的表面蒸汽覆盖。结合沸腾模式转变进一步解释了全局传热特性与峰值传热能力，明确了壁面干涸与体积蒸汽份额在传热恶化中的各自作用。在所有案例中，雷诺数为2000时提供了最有利的整体热响应。总体而言，在本研究考虑的矩形微通道构型及运行范围内，雷诺数与蒸汽组织、沸腾转变、壁面干涸及全局传热性能密切相关。
英文摘要
Three-dimensional conjugate simulations were conducted to investigate saturated flow boiling in a rectangular mini-channel, with particular emphasis on the role of inlet Reynolds number on boiling mode selection and transition. A C++ based open-source numerical framework was employed, incorporating a physically informed multi-site nucleation model by coupling a nucleation site density correlation with a Halton-sequence based spatial allocation strategy. Two distinct Re-dependent transition pathways were identified. At low Re, boiling transition is mainly associated with localized dryout development associated with upstream active boiling and progressive downstream liquid starvation. At high Re, the transition is characterized by convective stretching and reorganization of vapor structures, through which elongated vapor slugs evolve into localized vapor films and eventually approach full surface vapor coverage. The global heat transfer characteristics and peak heat transfer capacity are further interpreted in conjunction with boiling mode transition, clarifying the respective roles of wall dryout and volumetric vapor fraction in heat transfer deterioration. Among all cases, Re=2000 provides the most favorable overall thermal response. Overall, within the rectangular mini-channel configuration and operating range considered in this study, Re is closely associated with vapor organization, boiling transition, wall dryout, and global heat transfer performance.
