Cooling Heat Transfer of Supercritical CO2 in Diverging and Converging Microtubes,Chemical Engineering & Technology

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Cooling Heat Transfer of Supercritical CO2 in Diverging and Converging Microtubes
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2021-12-08 , DOI: 10.1002/ceat.202100202
Zhengming Yi _{1,

2} , Yong Xu _{1,

2} , Xiaolin Chen _{1,

2}

Affiliation

The motivation of this research was to solve the problem of heat transfer deterioration of supercritical CO₂ in tubes. The cooling heat transfer of supercritical CO₂ in diverging and converging microtubes was numerically studied. Under the conditions proposed, the heat transfer coefficient of the tube wall is relatively uniform. When the heat transfer coefficient becomes most uniform, the diameter change rate of the diverging microtube is greater than that of the converging microtube. Both the Richardson number and the relative difference of the heat transfer coefficient increase with increasing tube diameter, indicating that the buoyancy effect is the reason for different heat transfer coefficients in different flow directions.

中文翻译：

超临界CO2在发散和会聚微管中的冷却传热

_{本研究的目的是解决超临界CO 2}在管内传热劣化的问题。_{数值研究了超临界CO 2}在发散和收敛微管中的冷却传热。在所提出的条件下，管壁的传热系数比较均匀。当传热系数变得最均匀时，发散微管的直径变化率大于收敛微管的直径变化率。理查森数和传热系数的相对差异均随着管径的增大而增大，说明浮力效应是不同流向传热系数不同的原因。

更新日期：2022-02-10

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