Resistance characteristics of supercritical CO<sub>2</sub> in circular tube

WU Xinming; ZHU Bingguo; ZHANG Liang; SUN Enhui; ZHANG Haisong; XU Jinliang

doi:10.11949/j.issn.0438-1157.20180264

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Resistance characteristics of supercritical CO₂ in circular tube

更新时间：2025-12-10

- Resistance characteristics of supercritical CO₂ in circular tube
- CIESC Journal Issue 12, Pages: 5024-5033(2018)
- 作者机构：
  
  华北电力大学低品位能源多相流与传热北京市重点实验室,北京,102206
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180264
  CLC： K222
- Online First：05 December 2018，
  
  Published：05 December 2018
- 稿件说明：
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WU Xinming, ZHU Bingguo, ZHANG Liang, et al. Resistance characteristics of supercritical CO₂ in circular tube[J]. CIESC Journal, 2018, (12): 5024-5033. DOI: 10.11949/j.issn.0438-1157.20180264.
DOI：

WU Xinming, ZHU Bingguo, ZHANG Liang, et al. Resistance characteristics of supercritical CO₂ in circular tube[J]. CIESC Journal, 2018, (12): 5024-5033. DOI: 10.11949/j.issn.0438-1157.20180264. DOI：

摘要

对超临界二氧化碳在圆管内流动时的压降和摩擦系数进行了实验研究。实验段长为2000 mm，内径为10 mm。该实验压力范围为8～16 MPa，质量流量范围为1000～1525 kg·m-2·s-1，内壁热通量范围为96.5～283.2 kW·m-2。得到了不同工况下竖直圆管内流动阻力的变化规律，分析了压力、质量流速、主流焓值和热通量对圆管内摩擦阻力的影响。实验结果表明摩擦压降随着质量流量和压力的增加而显著增加，特别是当主流焓值超过拟临界焓值后，其增加的速度变得更加剧烈，同时发现热通量对摩擦压降的影响较小。对于预测常物性摩擦因子的经验关联式并不能预测超临界CO2的摩擦因子。因此提出了一个新的经验关联式，其实验数据在±20%误差范围内占83.31%。

Abstract

An experimental investigation of the pressure drop and friction factor of supercritical CO2 in circular tube is presented. Experimental length and inner diameter of the circular tube are 2000 mm and 10 mm. The experimental pressure ranges from 8 MPa to 16 MPa

mass flux ranges from 1000 kg·m-2·s-1 to 1525 kg·m-2·s-1

and heat flux on the inner wall ranges from 96.5 kW·m-2 to 283.2 kW·m-2. The variation of flow resistance was obtained and the effects of pressure

mass flux

heat flux and bulk fluid enthalpy on the frictional flow resistance coefficient of the circular tube were analyzed. The results showed that the frictional pressure drop increases significantly with increasing mass flux and pressure

particularly when the bulk enthalpy surpasses the pseudo-critical enthalpy

increased speed has become more intense

and meanwhile

it is found that the influence of heat flux on the friction pressure drop is not too great. The assessment of correlations demonstrated that constant-property-based correlations fail to predict the friction factor of supercritical CO2. Therefore

a new empirical correlation is proposed

and the experimental data accounts for 83.31% within the ±20% error band.

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Resistance characteristics of supercritical CO2 in circular tube

DOI：10.11949/j.issn.0438-1157.20180264

摘要

Abstract

关键词

Keywords

references

Resistance characteristics of supercritical CO₂ in circular tube