Heat transfer of a buoyancy-aided turbulent flow in a trapezoidal annulus

Duan, Yu; He, Suqin

doi:10.1016/j.ijheatmasstransfer.2017.06.070

Cited by 4 publications

(4 citation statements)

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“…Geometry Model. The considered configuration of the flow passage is a trapezoid annulus which is similar to that studied experimentally by Wu and Trupp [13] and also that adopted by Duan and He study [22,23]. The cross-sectional view of the channel is illustrated in Fig.…”

Section: Computational Proceduresmentioning

confidence: 98%

“…However, these did not lead to a large discrepancy in bulk parameters of the subchannels. Although numerical studies using large eddy simulation (LES) are still limited due to the excessive requirements of computational time and mesh density, it has been demonstrated by some authors to be superior to the Reynolds-averaged Navier-Stokes in predicting the characteristics of the flow such as the vortex street and flow pulsations in the narrow gaps in fuel rod bundles [18,[21][22][23]. In particular, it has been demonstrated in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, it has been demonstrated in Refs. [22] and [23] that the buoyancy force has non-negligible effects on the behavior of the large flow structures in the narrow gaps of the tight-packed rod bundle.…”

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation Study on Forced Convection Heat Transfer to Water at Supercritical Pressure in a Trapezoid Annulus

Amin

Duan

2017

Journal of Nuclear Engineering and Radiation Science

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It is now well known that heat transfer to fluid at supercritical pressure in a confined channel shows complex behaviors. This is due to the strong variations of the thermal–physical properties resulting from the changes of pressure and temperature. To improve the reliability and efficiency of the supercritical water-cooled reactors (SCWRs) to be designed, the understanding of supercritical fluid flow in the fuel assemblies is very important. The study reported here reconsiders a simplified geometry made of a trapezoid channel enclosing an inner rod to simulate the triangular arrangement of a fuel assembly. Large eddy simulation (LES) with the wall adapting local eddy viscosity (WALE) model is used to simulate the forced convection flow in the channel. Supercritical water at 25 MPa is used as the working fluid. The Reynolds number of flow based on the hydraulic diameter and the bulk velocity is 10,540, while the heat flux from the inner rod wall has been varied from 10 kW/m2 to 75 kW/m2. Large unsteady flow structures are observed to be present due to the nonuniformity of the cross section of the flow channel. The characteristics of the flow structures and their effect on the local heat transfer are analyzed using instantaneous velocities, spectrum analysis, and correlation analysis. The swinging flow structures in the wide gap are much weaker than those in the narrow gap. The behaviors of such large flow structures are influenced by the strong spatial and temporal variations of the properties. When the temperature distribution follows Tb < Tpc < Tw, the mixing parameters due to the large flow structures, including mixing coefficient and effective mixing velocity in the gap, are also significantly influenced.

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Section: Computational Proceduresmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation Study on Forced Convection Heat Transfer to Water at Supercritical Pressure in a Trapezoid Annulus

Amin

Duan

2017

Journal of Nuclear Engineering and Radiation Science

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“…For the complexity of the water phase (mixture of liquid and gas), the buoyancy-aided turbulent heat transfer model was used in the TZ area. For turbulent mixed convection in a uniform heated zone this model uses [ 36 ]:

…”

Section: Process Modellingmentioning

confidence: 99%

Effects of Underwater Friction Stir Welding Heat Generation on Residual Stress of AA6068-T6 Aluminum Alloy

et al. 2022

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This article aims to study water-cooling effects on residual stress friction stir welding (FSW) of AA6068-T6 aluminum alloy. For this reason, the FSW and submerged FSW processes are simulated by computational fluid dynamic (CFD) method to study heat generation. The increment hole drilling technique was used to measure the residual stress of welded samples. The simulation results show that materials softening during the FSW process are more than submerged. This phenomenon caused the residual stress of the joint line in the submerged case to be lower than in the regular FSW joint. On the other hand, the results revealed that the maximum residual stresses in both cases are below the yielding strength of the AA6068-T6 aluminum alloy. The results indicated that the residual stress along the longitudinal direction of the joint line is much larger than the transverse direction in both samples.

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Experimental investigation on the thermohydraulic parameters of Kartini research reactor under variation of the primary pump flow

Riyono

Pulungan

Dharmawan

et al. 2022

Applied Thermal Engineering

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Heat transfer of a buoyancy-aided turbulent flow in a trapezoidal annulus

Cited by 4 publications

References 50 publications

Large Eddy Simulation Study on Forced Convection Heat Transfer to Water at Supercritical Pressure in a Trapezoid Annulus

Large Eddy Simulation Study on Forced Convection Heat Transfer to Water at Supercritical Pressure in a Trapezoid Annulus

Effects of Underwater Friction Stir Welding Heat Generation on Residual Stress of AA6068-T6 Aluminum Alloy

Experimental investigation on the thermohydraulic parameters of Kartini research reactor under variation of the primary pump flow

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