Numerical study on cooling heat transfer and pressure drop of supercritical CO2 in wavy microchannels

Lei, Yuchuan; Chen, Zhenqian

doi:10.1016/j.ijrefrig.2018.03.023

Cited by 29 publications

(3 citation statements)

References 41 publications

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“…Yang [15] and Lei and Chen [18] respectively used the RNG k-e model and LB low Re model to study the heat transfer characteristics of supercritical CO 2 in tubes. Li et al [22] found that the SST k-w model showed excellent agreement with the experimental data.…”

Section: Model Comparison and Validationmentioning

confidence: 99%

“…Liu et al [17] numerically simulated the heat transfer of supercritical CO 2 in a heating spiral tube with inclination angles of -90 to 90°, and discussed the influence of buoyancy and centrifugal force in the flow direction under operating conditions on the heat transfer characteristics. The cooling heat transfer and pressure drop of supercritical CO 2 in horizontal wavy microtubes were numerically investigated by Lei and Chen [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Cooling Heat Transfer of Supercritical CO₂ in Diverging and Converging Microtubes

Chen

2022

Chem Eng & Technol

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The motivation of this research was to solve the problem of heat transfer deterioration of supercritical CO 2 in tubes. The cooling heat transfer of supercritical CO 2 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.

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Section: Model Comparison and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cooling Heat Transfer of Supercritical CO₂ in Diverging and Converging Microtubes

Chen

2022

Chem Eng & Technol

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“…Square microchannels are widely used in air conditioning, refrigeration, heat pipe, and other systems. Lei and Chen [62] conducted numerical studies on the cooling heat transfer and hydraulic characteristics of SCO 2 in a horizontal wavy microchannel with a square cross-section. The LB model had a better prediction by comparing the results of nine different turbulence models with experimental data.…”

Section: Square Microchannelsmentioning

confidence: 99%

A Review of Flow and Heat Transfer Characteristics of Supercritical Carbon Dioxide under Cooling Conditions in Energy and Power Systems

Wei

Tian

et al. 2022

Energies

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Supercritical carbon dioxide (SCO2) is widely used in many fields of energy and power engineering, such as nuclear reactors, solar thermal power generation systems, and refrigeration systems. In practical applications, SCO2 undergoes a cooling process significantly when it is cooled near the pseudo−critical point. Because of the drastic variations in thermo−physical properties, the heat transfer characteristics fluctuate, affecting the heat exchange and overall cycle performance. This paper summarizes extensive experiments and numerical simulations on the cooling process of SCO2 in various application scenarios. The effects of various working conditions, such as mass flow, working pressure, pipe diameter, flow direction, and channel shapes, are reviewed. The applicability and computational results using different numerical methods under different working conditions are also summarized. Furthermore, empirical correlations obtained in experiments at different conditions are included. The present review can provide a helpful guideline for the design of effective cooling systems or condensers so that the accuracy of the design and efficiency of the system can be improved.

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Recent Development of Heat Transfer and Fluid Flow of Supercritical CO2 in Tubes: Mechanisms and Applications

Zhang,

Shao,

Liu

et al. 2024

J. Therm. Sci.

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Numerical study on cooling heat transfer and pressure drop of supercritical CO2 in wavy microchannels

Cited by 29 publications

References 41 publications

Cooling Heat Transfer of Supercritical CO₂ in Diverging and Converging Microtubes

Cooling Heat Transfer of Supercritical CO₂ in Diverging and Converging Microtubes

A Review of Flow and Heat Transfer Characteristics of Supercritical Carbon Dioxide under Cooling Conditions in Energy and Power Systems

Recent Development of Heat Transfer and Fluid Flow of Supercritical CO2 in Tubes: Mechanisms and Applications

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Numerical study on cooling heat transfer and pressure drop of supercritical CO2 in wavy microchannels

Cited by 29 publications

References 41 publications

Cooling Heat Transfer of Supercritical CO2 in Diverging and Converging Microtubes

Cooling Heat Transfer of Supercritical CO2 in Diverging and Converging Microtubes

A Review of Flow and Heat Transfer Characteristics of Supercritical Carbon Dioxide under Cooling Conditions in Energy and Power Systems

Recent Development of Heat Transfer and Fluid Flow of Supercritical CO2 in Tubes: Mechanisms and Applications

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Product

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Cooling Heat Transfer of Supercritical CO₂ in Diverging and Converging Microtubes

Cooling Heat Transfer of Supercritical CO₂ in Diverging and Converging Microtubes