截面形状对微通道流动沸腾影响的数值研究

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截面形状对微通道流动沸腾影响的数值研究

更新时间：2025-07-09

- 截面形状对微通道流动沸腾影响的数值研究
- Issue 11, Pages: 101-111(2019)
- 作者机构：
  
  1. 中国南方电网有限责任公司
  2. 西安交通大学能源与动力工程学院
  3. 南方电网科学研究院有限责任公司直流输电技术国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK124;TM721.1
- Published：2019
- 稿件说明：
移动端阅览
[J]. 2019, (11): 101-111.
DOI：

[J]. 2019, (11): 101-111. DOI：

摘要

针对换流阀元件在工作时需要高效冷却的要求

采用全氟己烷类液体为工质的微通道相变冷却代替传统水冷系统

并对其在圆形、方形、三角形和梯形4种截面形状微通道内的流动沸腾特性进行了数值模拟

质量流量范围为0.000 1～0.002 kg/s

热流密度范围为50～500 kW/m

。数值分析结果表明:通道内的锐角边会限制气泡的生长

加速气泡的融合、破碎;局部换热系数沿流动方向逐渐增大

相同当量直径下三角形通道局部换热系数最大

圆形次之

梯形最小;随着热流密度与质量流量增大

4种通道的平均换热系数均增大

当质量流量增大19倍时

换热系数增大0.11～0.32倍

压降增大5.62～8.98倍;当热流密度增大9倍时

换热系数增大0.16～0.20倍

压降增大1.08～1.53倍;三角形通道的性能因子最大

综合换热性能最佳。该研究可为换流阀微通道相变冷却系统的设计提供理论依据。

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