Turbulent convective heat transfer of methane at supercritical pressure in a helical coiled tube

Wang, Chenggang; Sun, Baokun; Wang, Lin; He, Fan; You, Yingqiang; Yu, Jiuyang

doi:10.1007/s11630-018-0984-5

Cited by 19 publications

(4 citation statements)

References 13 publications

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“…As shown in the table, most scholars validated their numerical methods by comparing the Nusselt number, heat transfer coefficient or wall temperature of the available experimental data in the literature [19,50,52,78,79]. However, due to the limited experimental and DNS database of supercritical fluids flowing in curved tubes, some studies can only validate the numerical calculations with experimental data in straight tubes [80] or empirical correlation with constant fluid properties [81,82]. Therefore, more experimental and DNS studies should be conducted to provide an abundant reliable database for numerical model validation.…”

Section: Numerical Studymentioning

confidence: 99%

“…To effectively and accurately obtain the thermal physical properties distribution along the physical model, it is essential to choose an appropriate turbulence model. The turbulence model can be Spalart Allmaras (SA/RSM) [78], Renormalization Group (RNG) k-ε [30,60,61,81,83], RSM [80] or Shear Stress Transport SST k-ω [19,32,50,79,84]. As shown in Table 2, SST k-ω models and RNG k-ε model are mostly used in the previous numerical analysis.…”

Section: Numerical Studymentioning

confidence: 99%

“…Wang et al [80] pointed out that both the Gr/Re 2 and Gr/Re 2.7 parameters can effectively predict the buoyancy force in a helically coiled tube based on their numerical study of supercritical methane. However, Xu's [72] study of supercritical CO 2 indicated that the parameter of Gr/Re 2.7 was incapable of predicting the influence of buoyancy force in a vertical helically coiled tube.…”

Section: The Effect Of Flow Direction On the Axial Directionmentioning

confidence: 99%

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Research Progress on Convective Heat Transfer Characteristics of Supercritical Fluids in Curved Tube

Liu

et al. 2022

Energies

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Because of their compact structure, ease of processing and higher heat transfer coefficient, curved-tube heat exchangers are widely applied in various industry applications, such as nuclear power systems, solar-powered engineering, aircraft engine cooling systems and refrigeration and cryogenic systems. Accurate knowledge about the heat transfer characteristics of the supercritical fluids in the tube is critical to the design and optimization of a curved-tube heat exchanger. The available literature indicates that the flow of supercritical fluids flowing in curved tubes affected by the dual effects of the buoyancy force and centrifugal force is more complex compared to straight tubes. Therefore, to obtain insight into their unique characteristics and further research progress, this paper presents a comprehensive review of available experimental and numerical research works on fluids at supercritical pressure flowing in curved tubes. Overall, the secondary flow caused by the curvature enhances the heat transfer and delays the heat transfer deterioration, but it also causes a non-uniform heat transfer distribution along the circumferential direction, and the strengthening performance of the curved tube is damaged. Compared with the more mature theories regarding straight tubes, the flow structure, the coupling mechanism of buoyancy and centrifugal force, and the general heat transfer correlation of supercritical fluids in a curved tube still urgently need to be further studied. Most importantly, studies on the suppression of heat transfer oscillations and heat transfer inhomogeneities specific to curved tubes are scarce. Considering the current status and shortcomings of existing studies, some study topics for supercritical fluids in a curved tube are proposed.

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Section: Numerical Studymentioning

confidence: 99%

Section: Numerical Studymentioning

confidence: 99%

Section: The Effect Of Flow Direction On the Axial Directionmentioning

confidence: 99%

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Research Progress on Convective Heat Transfer Characteristics of Supercritical Fluids in Curved Tube

Liu

et al. 2022

Energies

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“…The superposition of the buoyancy secondary flow and the centrifugal secondary flow resulted in the maximum Vs near the bottom being 17.6% higher than that near the top. Wang et al [10] numerically analyzed the characteristics of supercritical methane in heated horizontal HCT under constant wall temperature with Reynolds Stress Model. The combined influences of buoyancy and centrifugal force led to the appearance of cold fluid at the outer-right region.…”

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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Phase Prediction of Supercritical Carbon Dioxide and its Application in Fracturing Oil Wellbores

et al. 2019

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Turbulent convective heat transfer of methane at supercritical pressure in a helical coiled tube

Cited by 19 publications

References 13 publications

Research Progress on Convective Heat Transfer Characteristics of Supercritical Fluids in Curved Tube

Research Progress on Convective Heat Transfer Characteristics of Supercritical Fluids in Curved Tube

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

Phase Prediction of Supercritical Carbon Dioxide and its Application in Fracturing Oil Wellbores

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