Evaluation Criterion of Buoyancy and Thermal Acceleration Behavior of Supercritical CO<sub>2</sub> in a Horizontal Circle Tube

doi:10.7652/xjtuxb201809019

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Evaluation Criterion of Buoyancy and Thermal Acceleration Behavior of Supercritical CO₂ in a Horizontal Circle Tube

更新时间：2025-05-01

- Evaluation Criterion of Buoyancy and Thermal Acceleration Behavior of Supercritical CO₂ in a Horizontal Circle Tube
- Vol. 52, Issue 9, Pages: 140-147(2018)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201809019
  CLC： TK24
- Online First：10 September 2018，
  
  Published：2018
- 稿件说明：
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Evaluation Criterion of Buoyancy and Thermal Acceleration Behavior of Supercritical CO₂ in a Horizontal Circle Tube[J]. 2018, 52(9): 140-147. DOI: 10.7652/xjtuxb201809019.
DOI：

Evaluation Criterion of Buoyancy and Thermal Acceleration Behavior of Supercritical CO₂ in a Horizontal Circle Tube[J]. 2018, 52(9): 140-147. DOI: 10.7652/xjtuxb201809019. DOI：

摘要

针对超临界CO

流体特殊的热物性所导致的奇异流动传热规律

开展了2 mm内径的水平光滑圆管的传热试验研究。试验压力为7.4～8 MPa

质量流速为600～1 000 kg/(m

·s)

最大热流密度为94.2 kW/m

。试验获得了壁温和传热系数的变化规律

分析了不同的试验工况下无量纲浮升力和热加速的变化规律。结果表明:流体的传热系数峰值随热流密度升高逐渐向入口移动; 不同无量纲浮升力的变化趋势存在较大的偏差

Kim的浮升力公式可较好地评判浮升力的大小; 热加速效应在低热流密度下不显著

在高热流密度下呈现先递增后递减的趋势; 当浮升力因子小于5.6×10

-7

和热加速因子小于0.000 5时

浮升力效应和热加速效应可忽略。将浮升力和热加速因子引入新的Nusselt预测关联式

其平均误差为-2.92%

均方根误差为10.96%。

Abstract

According to the complex thermophysical properties of supercritical CO

the heat transfer experiments on a smooth horizontal tube with a 2 mm inner diameter were carried out. The test pressure was 7.4 - 8 MPa

the mass flux was about 600 - 1 000 kg/(m

·s)

and the maximum heat flux was 94.2 kW/m

. Through experiments

the wall temperature and local heat transfer coefficient were obtained. The non-dimensional buoyancy and thermal acceleration behavior under different experimental conditions were analyzed. The results show that the peak heat transfer coefficient of the fluid increases gradually with the heat flux an

d that there exists great deviation in the variation trend for different non-dimensional buoyancy. The Kim's buoyancy correlation can better judge the value of buoyancy. Three different non-dimensional thermal accelerations indicate that the effect of thermal acceleration at low heat flux is not significant

while at high heat flux the acceleration effect presents a first increasing then decreasing tendency. When the buoyancy factor and thermal acceleration factor are less than 5.6×10

-7

and 0.000 5

respectively

the effects of both buoyancy and thermal acceleration can be ignored. By taking into account both buoyancy and thermal acceleration

a new Nusselt correlation can be established. The average error and root mean square error of the correlation is -2.92% and 10.96%

respectively.

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references

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School of Energy and Power Engineering, Xi'an Jiaotong University

⁰

Evaluation Criterion of Buoyancy and Thermal Acceleration Behavior of Supercritical CO2 in a Horizontal Circle Tube

DOI：10.7652/xjtuxb201809019

摘要

Abstract

关键词

Keywords

references

Evaluation Criterion of Buoyancy and Thermal Acceleration Behavior of Supercritical CO₂ in a Horizontal Circle Tube