Experimental and numerical comparison of the heat transfer behaviors and buoyancy effects of supercritical CO2 in various heating tubes

Zhang, Shijie; Xu, Xiaoxiao; Liu, Chao; Liu, Xinxin; Ru, Zhipeng; Dang, Chaobin

doi:10.1016/j.ijheatmasstransfer.2019.119074

Cited by 65 publications

(7 citation statements)

References 40 publications

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“…Liu and Xu [32] compared nine turbulence models with experimental results of sCO 2 passing through helical tube and suggested the Shear Stress Transport model for best prediction to heat transfer characteristics. The comparisons of various turbulent models were performed in previous research works for different supercritical fluids including sCO 2 [32][33][34][35][36], supercritical water [37][38][39][40][41][42], supercritical methane [43], supercritical nitrogen [44], supercritical fluid R134a [31,45,46] and supercritical fluid R1234ze (E) [1]. These findings suggested good agreement between simulations (performed by SST k-ω model) and experimental data.…”

Section: Introductionsupporting

confidence: 54%

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Ibrahim¹,

Hu²,

Jiang³

et al. 2021

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The heat transfer of supercritical fluids is a vastly growing field, specifically to find suitable alternative to replace conventional R134a, which can be beneficial for climate change. A considerable suggestion is R515A which possesses considerably lower global warming potential. The present simulations are designed to study supercritical fluid R515A under cooling conditions in horizontal position. The effect of pressure, mass flux, heat flux and tube diameter were considered for horizontal tube in the vicinity of pseudo critical temperature. Numerical investigations on heat transfer characteristics of supercritical fluid R515A were performed using widely used shear-stress transport (SST) model. Moreover, heat transfer correlations were developed and suggested to accurately predict Nusselt number within 10% accuracy. The simulation results showed about 3.98% average absolute deviation.

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Section: Introductionsupporting

confidence: 54%

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Ibrahim¹,

Hu²,

Jiang³

et al. 2021

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“…S.Yildiz [7] found that the heat transfer is easier to deteriorate in large tube diameters, and the heat transfer performance of the small tube diameters is better. Zhang [8] numerically studied the differences in heat transfer characteristics of S-CO2 flowing in horizontal, vertical and vertical helical tubes, the results show that the buoyancy effect is different in the three kinds of tubes. The heat transfer deterioration occurs in the vertical tube, while the heat transfer performance is better in the horizontal tube and helical tube.…”

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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“…Zhang et al [6] comparatively investigated the characteristics of sCO 2 flowing in ST and vertical HCT through experiments. Results showed that HCT has remarkable advantage in average heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation On Heat Transfer Enhancement And New Correlation Of Supercritical R1234ze(E) In Horizontal Helically Coiled Tube

Jiang¹,

Hu²,

Chen³

et al. 2022

Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering

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HFOs refrigerant R1234ze(E) has been widely applied in supercritical heat pump system and supercritical Organic Rankine Cycle (ORC) in recent years due to zero ODP and extremely low GWP. In this paper, experimental research on the cooling heat transfer performances of supercritical HFO-1234ze(E) in horizontal helically coiled tube (HCT) is performed. The impacts of mass flux (G) and pressure (P) on the heat transfer coefficient (h), the relative proportion of gravitational buoyancy effect and centrifugal buoyancy effect ( g c Ri / Ri ), the heat transfer enhancement of HCT and the distribution of secondary flow velocity (Vs) are detailed analyzed. The increasing P suppresses the impact of G on h, while the increasing G strengthens the influence of P on h. g c Ri / Ri decreases with the enhancement of G, yet increases with the rising P. The higher the mass flux is, the more obvious the influence of centrifugal force on the cross-sectional distribution of Vs will be, and the more significant the heat transfer enhancement of HCT will become. When G is 240 and 400 kg/m 2 s respectively, h of s-R1234ze(E) in helical tube is 12.73% and 18.69% higher than that in straight tube. The variation of P hardly changes the centrifugal effect on the distribution of Vs, thus having little impact on the heat transfer enhancement of HCT. When P is 4.5 and 5 MPa respectively, h of helical tube is 15.38% and 15.12% higher than that of straight tube. In the region of Tb>Tpc, the correlation of straight tube has large prediction deviations for the performances of s-R1234ze(E) in helical tube owing to the absence of Ric term.

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Experimental and numerical comparison of the heat transfer behaviors and buoyancy effects of supercritical CO2 in various heating tubes

Cited by 65 publications

References 40 publications

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

Thermophysical Properties and Supercritical Heat Transfer Characteristics of R515A

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

Experimental Investigation On Heat Transfer Enhancement And New Correlation Of Supercritical R1234ze(E) In Horizontal Helically Coiled Tube

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