Numerical Investigation of Subcooled Flow Boiling at Different Flow Velocities in a 3D Rectangular Cross-Section Channel

JIN Shuqi; CHEN Yujie; LING Kong; TAO Wenquan

doi:10.7652/xjtuxb202505006

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Numerical Investigation of Subcooled Flow Boiling at Different Flow Velocities in a 3D Rectangular Cross-Section Channel

更新时间：2025-08-26

- Numerical Investigation of Subcooled Flow Boiling at Different Flow Velocities in a 3D Rectangular Cross-Section Channel
- Journal of Xi’an Jiaotong University Vol. 59, Issue 5, Pages: 54-63(2025)
- 作者机构：
  
  1.西安交通大学热流科学与工程教育部重点实验室， 710049，西安
  2.北京石油化工学院， 102617，北京
  3.西安数峰信息科技有限责任公司， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202505006
  CLC： TK124
- Received：20 November 2024，
  
  Online First：10 January 2025，
  
  Published：10 May 2025
- 稿件说明：
移动端阅览
JIN Shuqi, CHEN Yujie, LING Kong, et al. Numerical Investigation of Subcooled Flow Boiling at Different Flow Velocities in a 3D Rectangular Cross-Section Channel[J]. Journal of Xi’an Jiaotong University, 2025, 59(5): 54-63.
DOI：

JIN Shuqi, CHEN Yujie, LING Kong, et al. Numerical Investigation of Subcooled Flow Boiling at Different Flow Velocities in a 3D Rectangular Cross-Section Channel[J]. Journal of Xi’an Jiaotong University, 2025, 59(5): 54-63. DOI： 10.7652/xjtuxb202505006.

摘要

为探究微液层蒸发对于过冷流动沸腾的贡献，基于适用于方管内流动沸腾的微液层模型，考虑流固耦合传热和动态接触角的影响，采用界面捕捉方法（VOSET）对基本的三维矩形截面通道单元内过冷流动沸腾过程中壁面上附着的单气泡生长情况展开数值探究，讨论了不同入口流速下通道内单气泡生长演变的流型和壁面过热度的变化，并对其微液层分布、蒸发量和传热性能作以定量分析，以增加对微小通道沸腾传热的理解和认识，为完整流程的流动沸腾传热研究奠定基础。计算结果表明：初始气泡随着加热和流动的影响沿着壁面生长滑动，体积膨胀直至气泡直径与通道截面尺寸相当后形成延长气泡，最终流出通道，气泡与壁面之间的微液层蒸发作用为气泡的生长和传热贡献了很大的作用，尤其在形成延长气泡后，蒸发热流占比最高可达近80%，直接影响着局部壁面过热度和对流传热系数的大小；增大流速后，同一时刻气泡生长的更快，但气泡在通道内的停留时间缩短，使得微液层蒸发发挥作用的时间缩短，总体上的平均对流传热系数随流速增加而减小。

Abstract

To investigate the contribution of microlayer evaporation to subcooled flow boiling

a numerical study is conducted based on a microlayer mathematical model suitable for flow boiling in square tubes. In this study

the effects of fluid-solid conjugate heat transfer and dynamic contact angles are considered

and the interface capturing method (VOSET) is employed to capture interfaces. The focus is on the growth of a single attached bubble on the wall during the process of subcooled flow boiling within a basic three-dimensional rectangular cross-section channel unit. The flow pattern evolution and wall superheat degree change during the growth and evolution of a single bubble in the channel under different flow velocity are discussed

and the distribution of microlayer

evaporation capacity and heat transfer performance are quantitatively analyzed

which enhances the understanding and knowledge of boiling heat transfer in microchannels

laying the foundation for research on flow boiling heat transfer in complete processes. The results show that the initial bubble grows and slides along the wall under the influence of heating and flow

expanding in volume until its diameter becomes comparable to the cross-sectional size of the channel

then an extended bubble is formed

and it flows out of channel. The evaporation of the microlayer between the bubble and the wall contributes greatly to the bubble growth and heat transfer. Especially after the formation of an elongated bubble

the evaporation heat flux can account for nearly 80% of the total

directly affecting the local wall superheat and convective heat transfer coefficient. With the increase of flow velocity

the bubble grows faster

but their residence time in the channel is shortened

thereby reducing the duration during which microlayer evaporation can play a significant role. On the whole

the average heat transfer coefficient decreases with the increase of inlet velocity.

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references

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