Supercritical “boiling” number, a new parameter to distinguish two regimes of carbon dioxide heat transfer in tubes

Zhu, Bingguo; Xu, Jinliang; Wu, X.P.; Xie, Jian; Li, Mingjia

doi:10.1016/j.ijthermalsci.2018.10.032

Cited by 133 publications

(21 citation statements)

References 33 publications

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“…It is to be noted that if one can show the existence of pseudoflow boiling, then the concepts and understanding of the extensively explored (Analytically, experimentally, and numerically) boiling physics can be directly employed for SF flow. This implication can be clearly illustrated by the recent work, 23,24 where criteria for the onset of HTD and heat transfer correlations are developed for supercritical FIG. 1.…”

Section: Introductionmentioning

confidence: 89%

Insights into the dynamics of supercritical water flow using a two-phase approach

Tripathi

Basu

2021

Physics of Fluids

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Section: Introductionmentioning

confidence: 89%

Insights into the dynamics of supercritical water flow using a two-phase approach

Tripathi

Basu

2021

Physics of Fluids

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“…The reason for heat transfer enhancement could be attributed to the occurrence of pseudo boiling. The concept of "pseudo boiling", which is analogous to the boiling phenomenon for subcritical fluids, is proposed to elaborate heat transfer mechanisms for the supercritical fluids [33,34]. When pseudo boiling occurs, a vapor-like fluid is generated continuously on the heating wall and enters into bulk flow, while the liquid-like fluid flows towards the heating wall in succession.…”

Section: Heat Transfer Characteristics Of the Tested Supercritical-prmentioning

confidence: 99%

Experiments on Heat Transfer of Supercritical Pressure Kerosene in Mini Tube under Ultra-High Heat Fluxes

et al. 2020

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Heat transfer of supercritical-pressure kerosene is crucial for regenerative cooling systems in rocket engines. In this study, experiments were devoted to measure the heat transfer of supercritical-pressure kerosene under ultra-high heat fluxes. The kerosene flowed horizontally in a mini circular tube with a 1.0 mm inner diameter and was heated uniformly under pressures of 10–25 MPa, mass fluxes of 8600–51,600 kg/m2 s, and a maximum heat flux of up to 33.6 MW/m2. The effects of the operating parameters on the heat transfer of supercritical-pressure kerosene were discussed. It was observed that the heat transfer coefficient of kerosene increases at a higher mass flux and inlet bulk temperature, but is little affected by pressure. The heat transfer of supercritical-pressure kerosene is classified into two regions: normal heat transfer and enhanced heat transfer. When the wall temperature exceeds a certain value, heat transfer is enhanced, which could be attributed to pseudo boiling. This phenomenon is more likely to occur under higher heat flux and lower mass flux conditions. In addition, the experimental data were compared with several existing heat transfer correlations, in which one of these correlations can relatively well predict the heat transfer of supercritical-pressure kerosene. The results drawn from this study could be beneficial to the regenerative cooling technology for rocket engines.

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“…The experimental data from Ref. [12] are selected to validate the numerical model to ensure the accuracy of numerical simulation. The experimental data in Figure 5 are measured in Beijing Key Laboratory of Multiphase Flow and Heat Transfer.…”

Section: Model Validationmentioning

confidence: 99%

“…The experimental system, parameter measurements and uncertainties, as well as the date reduction method are detailed in Ref. [12], which are not repeated here. During the selection of experimental runs, the effects of operation pressure, heat flux, and mass flux on heat transfer are considered.…”

Section: Model Validationmentioning

confidence: 99%

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Numerical Analysis on Heat Transfer Characteristics of Supercritical CO2 in Heated Vertical Up-Flow Tube

Yan

Zhu

et al. 2020

Materials

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It is great significance to understand the mechanism of heat transfer deterioration of supercritical CO2 for heat exchanger design and safe operation in the supercritical CO2 Brayton cycle. Three-dimensional steady-state numerical simulation was performed to investigate the behavior of supercritical CO2 heat transfer in heated vertical up-flow tube with inner diameter di = 10 mm and heated length Lh = 2000 mm. Based on the characteristics of inverted-annular film boiling at subcritical pressure, the heat transfer model of supercritical CO2 flowing in the heated vertical tube was established in this paper. The mechanisms of heat transfer deterioration (HTD) and heat transfer recovery (HTR) for supercritical CO2 were discussed. Numerical results demonstrate that HTD is affected by multiple factors, such as the thickness and property of vapor-like film near the wall, the turbulence intensity near the interface between liquid-like and vapor-like, and in the liquid-like core region as well as the distribution of radial velocity vector. Among the above factors, the change of turbulent kinetic energy caused by the buoyancy effect seems to be a more important contributor to HTD and HTR. Furthermore, the influences of heat flux and mass flux on the distribution of wall temperature were analyzed, respectively. The reasons for the difference in wall temperature at different heat fluxes and mass fluxes were explained by capturing detailed thermal physical properties and turbulence fields. The present investigation can provide valuable information for the design optimization and safe operation of a supercritical CO2 heat exchanger.

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Supercritical “boiling” number, a new parameter to distinguish two regimes of carbon dioxide heat transfer in tubes

Cited by 133 publications

References 33 publications

Insights into the dynamics of supercritical water flow using a two-phase approach

Insights into the dynamics of supercritical water flow using a two-phase approach

Experiments on Heat Transfer of Supercritical Pressure Kerosene in Mini Tube under Ultra-High Heat Fluxes

Numerical Analysis on Heat Transfer Characteristics of Supercritical CO2 in Heated Vertical Up-Flow Tube

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