Convective heat transfer of supercritical CO<sub>2</sub> flowing a mini circular tube under high heat flux and low mass flux conditions

YAN Jianguo; ZHU Fengling; GUO Pengcheng; LUO Xingqi

doi:10.11949/j.issn.0438-1157.20181440

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Convective heat transfer of supercritical CO₂ flowing a mini circular tube under high heat flux and low mass flux conditions

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Convective heat transfer of supercritical CO₂ flowing a mini circular tube under high heat flux and low mass flux conditions
- CIESC Journal Vol. 70, Issue 5, Pages: 1779-1787(2019)
- 作者机构：
  
  西安理工大学省部共建西北旱区生态水利国家重点实验室，陕西西安 710048
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181440
  CLC： TK 124
- Received：05 December 2018，
  
  Revised：2019-02-22，
  
  Online First：24 July 2026，
  
  Published：05 May 2019
- 稿件说明：
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颜建国, 朱凤岭, 郭鹏程, 罗兴锜. 高热流低流速条件下超临界CO₂在小圆管内的对流传热特性[J]. 化工学报, 2019, 70(5): 1779-1787 DOI: 10.11949/j.issn.0438-1157.20181440.

YAN Jianguo, ZHU Fengling, GUO Pengcheng, LUO Xingqi. Convective heat transfer of supercritical CO₂ flowing a mini circular tube under high heat flux and low mass flux conditions[J]. CIESC Journal, 2019, 70(5): 1779-1787 DOI: 10.11949/j.issn.0438-1157.20181440.
颜建国, 朱凤岭, 郭鹏程, 罗兴锜. 高热流低流速条件下超临界CO₂在小圆管内的对流传热特性[J]. 化工学报, 2019, 70(5): 1779-1787 DOI: 10.11949/j.issn.0438-1157.20181440. DOI：

YAN Jianguo, ZHU Fengling, GUO Pengcheng, LUO Xingqi. Convective heat transfer of supercritical CO₂ flowing a mini circular tube under high heat flux and low mass flux conditions[J]. CIESC Journal, 2019, 70(5): 1779-1787 DOI: 10.11949/j.issn.0438-1157.20181440. DOI：

摘要

为获取高热流、低流速条件下超临界CO

的传热规律，开展了超临界CO

在内径2 mm水平小圆管内对流传热试验研究，并重点探讨了变物性、浮升力和热加速等效应对传热过程的影响。试验参数范围：系统压力7.6~8.4 MPa，质量流速400~500 kg/(m

∙s)，热通量0~200 kW/m

，流体温度20~60℃，Reynolds数1.2×10

~4.3×10

。分别采用

和

作为浮升力效应和热加速效应的判别因子。结果显示，在高热流低流速工况下，浮升力效应显著（

-3

），同一个截面处的上壁面传热系数始终小于下壁面传热系数。浮升力效应是高热流低流速工况下传热恶化的主要诱发因素。试验中热加速因子较小（

8.5×10

-7

），其效应可以忽略。将试验数据与典型的传热经验关联式作对比，结果表明Liao-Zhao关联式的计算结果与试验结果最吻合。

Abstract

To obtain the heat transfer law of supercritical CO

under high heat flow and low flow rate

the experimental study on convective heat transfer of supercritical CO

in a small circular tube with an inner diameter of 2 mm was carried out

and the effects of variable properties

buoyancy and thermal acceleration were discussed. The operating parameters were as follows: system pressure

= 7.6—8.4 MPa

mass flux

= 400—500 kg/(m

∙s)

heat flux

= 0—200 kW/m

fluid temperature

= 20—62℃

and Reynolds number

= 1.23×10

—4.3×10

. The dimensionless parameters of

and

were adopted to represent the buoyancy effect and thermal acceleration

respectively. The results show that the buoyancy effect is significant (

-3

) under high heat flux and low mass flux conditions

and the heat transfer coefficients at top wall are always lower than those at bottom wall for a certain section. The buoyancy effect is the main factor that cause heat transfer deteriorate

while the thermal acceleration criterion is insignificant (

8.5×10

-7

) and thus can be neglected. The experimental data were compared with typical heat transfer empirical correlations

in which the Liao-Zhao correlation fit well with the experimental data.

关键词

Keywords

references

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⁰

Convective heat transfer of supercritical CO2 flowing a mini circular tube under high heat flux and low mass flux conditions

DOI：10.11949/j.issn.0438-1157.20181440

摘要

Abstract

关键词

Keywords

references

Convective heat transfer of supercritical CO₂ flowing a mini circular tube under high heat flux and low mass flux conditions