Thermal-hydraulic characteristics of supercritical pressure CO2 in vertical tubes under cooling and heating conditions

Guo, Jiangfeng; Xiang, Mengru; Zhang, Haiyan; Huai, Xiulan; Cheng, Ke; Cui, Xinying

doi:10.1016/j.energy.2018.12.177

Cited by 60 publications

(4 citation statements)

References 36 publications

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“…These two sets of validations demonstrate that the selected SST k − ω model can reliably reproduce data for both sCO 2 heat transfer in horizontal smooth tubes and the pressure drop and heat transfer heat transfer simulations [40][41][42][43], including the most recent work by Li et al [28,29,44] on the supercritical flow and heat transfer with internal helical-rib roughness where good accuracy was demonstrated. Therefore, this model has been used in this paper.…”

Section: Fig 2 Grids Used For Validations Against Experiments By Adeb...mentioning

confidence: 63%

A designed wall roughness approach to improve turbulent heat transfer to supercritical CO2 flowing in horizontal tubes

WANG

Yang

Gong

et al. 2022

The Journal of Supercritical Fluids

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Section: Fig 2 Grids Used For Validations Against Experiments By Adeb...mentioning

confidence: 63%

A designed wall roughness approach to improve turbulent heat transfer to supercritical CO2 flowing in horizontal tubes

WANG

Yang

Gong

et al. 2022

The Journal of Supercritical Fluids

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“…When HTD occurs, it might lead to the heating surface failure because of burning out. Hence, great attention has been paid on HTD [ 13 , 14 , 15 ]. At present, the mechanism of HTD is mainly studied by numerical methods and experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer Characteristics of scCO2 Flowing in a Vertically-Upward Tube with High Mass Flux

Gong

Zhu

Bin

et al. 2022

Entropy

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In this work, the heat transfer characteristics of supercritical pressure CO2 in vertical heating tube with 10 mm inner diameter under high mass flux were investigated by using an SST k-ω turbulent model. The influences of inlet temperature, heat flux, mass flux, buoyancy and flow acceleration on the heat transfer of supercritical pressure CO2 were discussed. Our results show that the buoyancy and flow acceleration effect based on single phase fluid assumption fail to explain the current simulation results. Here, supercritical pseudo-boiling theory is introduced to deal with heat transfer of scCO2. ScCO2 is treated to have a heterogeneous structure consisting of vapor-like fluid and liquid-like fluid. A physical model of scCO2 heat transfer in vertical heating tube was established containing a gas-like layer near the wall and a liquid-like fluid layer. Detailed distribution of thermophysical properties and turbulence in radial direction show that scCO2 heat transfer is greatly affected by the thickness of gas-like film, thermal properties of gas-like film and turbulent kinetic energy in the near-wall region. Buoyancy parameters Bu < 10-5, Bu* < 5.6 × 10−7 and flow acceleration parameter Kv < 3 × 10−6 in this paper, which indicate that buoyancy effect and flow acceleration effect has no influence on heat transfer of scCO2 under high mass fluxes. This work successfully explains the heat transfer mechanism of supercritical fluid under high mass flux.

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“…The heat transfer deterioration occurs in the vertical tube, while the heat transfer performance is better in the horizontal tube and helical tube. Guo [9] numerically studied the heat transfer characteristics of S-CO2 flowing in a tube under heating conditions. The results show that the buoyancy effect improves the downward flow heat transfer performance, while deteriorates that for upward flow under heating conditions, and it is found that decreasing the tube diameter and heat flux can alleviate heat transfer deterioration.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Heat Transfer Characteristics of Supercritical Carbon Dioxide Flowing Upward in a Vertical Tube

Jian¹,

Chen²,

Zhao³

et al. 2022

Preprint

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Thermal-hydraulic characteristics of supercritical pressure CO2 in vertical tubes under cooling and heating conditions

Cited by 60 publications

References 36 publications

A designed wall roughness approach to improve turbulent heat transfer to supercritical CO2 flowing in horizontal tubes

A designed wall roughness approach to improve turbulent heat transfer to supercritical CO2 flowing in horizontal tubes

Numerical Investigation of Heat Transfer Characteristics of scCO2 Flowing in a Vertically-Upward Tube with High Mass Flux

Experimental and Numerical Study on Heat Transfer Characteristics of Supercritical Carbon Dioxide Flowing Upward in a Vertical Tube

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