Mixed convective flow and heat transfer of supercritical CO2 in circular tubes at various inclination angles

Yang, Chuanyong; Xu, Jinliang; Wang, Xiaodong; Zhang, Wei

doi:10.1016/j.ijheatmasstransfer.2013.04.033

Cited by 82 publications

(17 citation statements)

References 23 publications

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“…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 . The results showed that the heat transfer coefficient in the horizontal tube were greater than the ones in other inclined angles.…”

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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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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“…Bae and Kim [5,6] conducted extensive experiments on heat transfer of vertically upward flowing CO2 under supercritical pressure in tubes (internal diameters (ID) of 4.4 mm and 9.0 mm), and proposed a new correlation for heat transfer by CO2. Xu et al [7,8] experimentally analyzed the turbulent convective heat transfer of CO2 flowing in a helical pipe at near-critical pressure with a constant heat flux boundary condition, and discussed the effect of inclination angles on the heat transfer of supercritical CO2 in a 0.5 mm diameter tube. Bae et al [9,10] investigated the turbulent heat transfer of CO2 at supercritical pressure flowing in heated vertical tubes using direct numerical simulation (DNS) at the inlet Reynolds numbers of 5400 and 8900.…”

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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“…There are a lot of related investigations on heat transfer performances of supercritical H 2 O and supercritical CO 2 [5][6][7] compared to the very limited information of supercritical hydrocarbon fuels. Deng et al [4] presented the heat transfer performances of aviation kerosene flowing in different flow directions and found that the inner tube wall temperature (T wi ) and heat transfer coefficient (HTC) of aviation kerosene are different in different flow directions.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer to aviation kerosene flowing upward in smooth tubes at supercritical pressures

Huang

et al. 2015

International Journal of Heat and Mass Transfer

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Mixed convective flow and heat transfer of supercritical CO2 in circular tubes at various inclination angles

Cited by 82 publications

References 23 publications

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

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

Heat transfer to aviation kerosene flowing upward in smooth tubes at supercritical pressures

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