Numerical simulation of liquid metal turbulent heat transfer from an inline tube bundle in cross-flow

Абрамов, А. Г.; Levchenya, Alexander M.; Смирнов, Е. М.; Smirnov, Pavel E.

doi:10.1016/j.spjpm.2016.02.002

Cited by 12 publications

(24 citation statements)

References 4 publications

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“…The 2D in-line tube bundle was employed to simplify the mathematical model. Satisfactory agreement with the experimental data with a 2D formulation was obtained in [28,40,41] for systems similar to the flow field studied in this work. A constant temperature t w = 42 and a no slip condition (U x = 0, U y = 0) were set on all walls of the tubes.…”

Section: Computational Domain and Boundary Conditionssupporting

confidence: 74%

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

et al. 2022

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The pulsating flow is one of the techniques that can enhance heat transfer, therefore leading to energy saving in tubular heat exchangers. This paper investigated the heat transfer and flow characteristics in a two-dimensional in-line tube bundle with the pulsating flow by a numerical method using the Ansys Fluent. Numerical simulation was performed for the Reynolds number Re = 500 with different frequencies and amplitude of pulsation. Heat transfer enhancement was estimated from the central tube of the tube bundle. Pulsation velocity had an asymmetrical character with a reciprocating flow. The technique developed by the authors to obtain asymmetric pulsations was used. This technique allows simulating an asymmetric flow in heat exchangers equipped with a pulsation generation system. Increase in both the amplitude and the frequency of the pulsations had a significant effect on the heat transfer enhancement. Heat transfer enhancement is mainly observed in the front and back of the cylinder. At a steady flow in these areas, heat transfer is minimal due to the weak circulation of the flow. The increase in heat transfer in the front and back of the cylinder is associated with increased velocity and additional flow mixing in these areas. The maximum increase in the Nusselt number averaged over space and time in the entire studied range was 106%, at a pulsation frequency of 0.5 Hz and pulsation amplitude of 4.5. A minimum enhancement of 25% was observed at a frequency of 0.166 Hz and amplitude of 1.25.

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Section: Computational Domain and Boundary Conditionssupporting

confidence: 74%

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

et al. 2022

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“…The 2D in-line tube bundle was employed to simplify the mathematical model. Satisfactory agreement with experimental data with 2D formulation was obtained in [28,40,41] for systems similar to the flow field studied in this work. A constant temperature tw = 42 °C and a no slip condition (Ux = 0, Uy = 0) were set on all walls of the tubes.…”

Section: Computational Domain and Boundary Conditionssupporting

confidence: 76%

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

Haibullina¹,

Hayrullin²,

Balzamov³

et al. 2022

Preprint

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The pulsating flow is one of the techniques which can enhance heat transfer, therefore leading to energy saving in tubular heat exchangers. This paper investigates the heat transfer and flow characteristics in a two-dimensional in-line tube bundle with the pulsating flow by a numerical method using the Ansys Fluent. Numerical simulation is performed for Reynolds number Re = 500 with different frequencies and amplitude of pulsation. Heat transfer enhancement was estimated from the central tube of the tube bundle. Pulsation velocity had an asymmetrical character with a reciprocating flow. The technique developed by the authors to obtain asymmetric pulsations was used. This technique allows simulating an asymmetric flow in heat exchangers equipped with a pulsation generation system. Increase in both the amplitude and the frequency of the pulsations has a significant effect on heat transfer enhancement. Heat transfer enhancement is mainly observed in the front and back of the cylinder. At a steady flow in these areas, heat transfer is minimal due to the weak circulation of the flow. The increase in heat transfer in the front and back of the cylinder is associated with increased velocity and additional flow mixing in these areas.

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“…In particular, we are interested in investigating the code reliability in the evaluation of the integral heat transfer. One of the main motivations for this work has been to reassess the results reported by Abramov et al, who suggested that a good agreement in terms of heat transfer prediction can be achieved for an in-line confined bundle with a relatively simple 2D URANS model [14]. If confirmed, this result could be important from a component design perspective due to the moderate computational cost compared with more sophisticated modeling approaches recommended for the simulation of conventional fluid flow in tube banks.…”

Section: Introductionmentioning

confidence: 62%

Numerical Study of Liquid Metal Turbulent Heat Transfer in Cross-Flow Tube Banks

et al. 2022

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Heavy liquid metals (HLM) are attractive coolants for nuclear fission and fusion applications due to their excellent thermal properties. In these reactors, a high coolant flow rate must be processed in compact heat exchangers, and as such, it may be convenient to have the HLM flowing on the shell side of a helical coil steam generator. Technical knowledge about HLM turbulent heat transfer in cross-flow tube bundles is rather limited, and this paper aims to investigate the suitability of Reynolds Average Navier–Stokes (RANS) models for the simulation of this problem. Staggered and in-line finite tube bundles are considered for compact (a=1.25), medium (a=1.45), and wide (a=1.65) pitch ratios. The lead bismuth eutectic alloy with Pr=2.21×10−2 is considered as the working fluid. A 2D computational domain is used relying on the k−ω Shear Stress Transport (SST) for the turbulent momentum flux and the Prt concept for the turbulent heat flux prediction. The effect of uniform and spatially varying Prt assumptions has been investigated. For the in-line bundle, unsteady k−ω SST/Prt=0.85 has been found to significantly underpredict the integral heat transfer with regard to theory, featuring a good to acceptable agreement for wide bundles and Pe≥1150. For the staggered tube bank, steady k−ω SST and a spatially varying Prt has been the best modeling strategy featuring a good to excellent agreement for medium and wide bundles. A poor agreement for compact bundles has been observed for all the models considered.

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Numerical simulation of liquid metal turbulent heat transfer from an inline tube bundle in cross-flow

Cited by 12 publications

References 4 publications

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

Numerical Study of Liquid Metal Turbulent Heat Transfer in Cross-Flow Tube Banks

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