Numerical investigation of cooling heat transfer to supercritical CO2 in a horizontal circular tube

Du, Zhongxuan; Lin, Wensheng; Gu, Aiqin

doi:10.1016/j.supflu.2010.05.023

Cited by 123 publications

(34 citation statements)

References 21 publications

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“…Accordingly, supercritical CO 2 is used as a novel refrigerant in mobile air‐conditioners and geothermal heat pumps. The thermal behaviors of supercritical CO 2 in the tube have been widely investigated experimentally and numerically …”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas

Wang

Dong

Xue

et al. 2019

Asia-Pacific J Chem Eng

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To further improve the thermal efficiency of the coal-fired boiler, lower environment restraints, and minimize key components, the supercritical CO 2 Brayton cycle was considered to replace the conventional steam Rankine cycle.In this paper, a three-dimensional mathematical model of the thermal behaviors between the supercritical CO 2 tube and flue gas was established using the Lam-Bremhorst k-ε model, the gas real model, and the P-1 radiation model. The distributions of the velocity and the temperature between the supercritical CO 2 tube and flue gas were investigated numerically. Furthermore, the effects of the supercritical CO 2 inlet temperature on the thermal behaviors were also examined. The results show the surface heat transfer coefficient goes up with the supercritical CO 2 inlet temperature due to the rise of the thermal conductivity. More significant thermal behaviors and detailed physical explanations were elaborated, which would offer a novel insight to understand, design, and optimize the supercritical CO 2 Brayton cycle for engineering applications.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas

Wang

Dong

Xue

et al. 2019

Asia-Pacific J Chem Eng

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“…Kim et al [34] researched the effects of the cross-sectional shape on the heat transfer of F i dioxide. Du et al [35] concluded that turbulent models were closely related to the heat transfer. Yang et al [36] discussed the effects of an inclined angle on the heat transfer of SC-CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics and Prediction Model of Supercritical Carbon Dioxide (SC-CO2) in a Vertical Tube

et al. 2017

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Due to its distinct capability to improve the efficiency of shale gas production, supercritical carbon dioxide (SC-CO 2 ) fracturing has attracted increased attention in recent years. Heat transfer occurs in the transportation and fracture processes. To better predict and understand the heat transfer of SC-CO 2 near the critical region, numerical simulations focusing on a vertical flow pipe were performed. Various turbulence models and turbulent Prandtl numbers (Pr t ) were evaluated to capture the heat transfer deterioration (HTD). The simulations show that the turbulent Prandtl number model (TWL model) combined with the Shear Stress Transport (SST) k-ω turbulence model accurately predicts the HTD in the critical region. It was found that Pr t has a strong effect on the heat transfer prediction. The HTD occurred under larger heat flux density conditions, and an acceleration process was observed. Gravity also affects the HTD through the linkage of buoyancy, and HTD did not occur under zero-gravity conditions.

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“…The authors mainly focused on flows with relatively low Reynolds numbers. Cao [21] and Du [22] numerically studied the convective heat transfer of supercritical CO 2 in horizontal miniature circular and triangular tubes.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Convective Heat Transfer of Supercritical Carbon Dioxide at Low Mass Fluxes

Lei

Zhang

et al. 2017

Applied Sciences

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Featured Application: Supercritical carbon dioxide Brayton cycle, geothermal system, nuclear reactor.Abstract: Significant differences in the heat transfer behaviors of supercritical carbon dioxide in a heated channel have been observed at different mass fluxes. At low mass fluxes, a unique heat transfer characteristic is accompanied by a monotonously smooth temperature variation without any temperature peak, even though the ratio of heat flux to mass flux (q/G) is high. In this study, experimental and numerical investigations explore the hidden mechanism of the peculiar heat transfer characteristics of supercritical carbon dioxide at low mass fluxes in vertically upward tubes with inside diameters (ID) of 5 mm. The range of operating conditions examined within the study include a mass flux (G) between 0-200 kg/m 2 s, and a heat flux (q) of up to 120 kW/m 2 . The parametric effects within these experimental conditions were analyzed on the basis of the obtained heat transfer data. Furthermore, a qualitative modeling force analysis and quantitative numerical simulation of vertical flow at low mass flux reveal the heat transfer mechanism for these temperature profiles. In addition, the distribution of flow parameters and thermo-physical properties (such as shear stress, density, and specific heat) in the near-wall region were also studied. It is found that the heat transfer behavior of supercritical CO 2 at low mass flux is similar to "film boiling" at subcritical pressure, where "vapor-like" fluid occupies the sublayer region. Due to reduced buoyancy, the fluid does not cause enough mixing/instability to bring it to the bulk flow.

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Numerical investigation of cooling heat transfer to supercritical CO2 in a horizontal circular tube

Cited by 123 publications

References 21 publications

Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas

Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas

Heat Transfer Characteristics and Prediction Model of Supercritical Carbon Dioxide (SC-CO2) in a Vertical Tube

Experimental and Numerical Investigation of Convective Heat Transfer of Supercritical Carbon Dioxide at Low Mass Fluxes

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Numerical investigation of cooling heat transfer to supercritical CO2 in a horizontal circular tube

Cited by 123 publications

References 21 publications

Numerical simulation of flow and heat transfer between supercritical CO2 tube and flue gas

Numerical simulation of flow and heat transfer between supercritical CO2 tube and flue gas

Heat Transfer Characteristics and Prediction Model of Supercritical Carbon Dioxide (SC-CO2) in a Vertical Tube

Experimental and Numerical Investigation of Convective Heat Transfer of Supercritical Carbon Dioxide at Low Mass Fluxes

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Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas

Numerical simulation of flow and heat transfer between supercritical CO₂ tube and flue gas