Numerical simulation on the flow and heat transfer characteristics in the one-side heating helically coiled tubes

Niu, Xiaojuan; Luo, Shuaishuai; Fan, Liang‐Liang; Zhao, Liang

doi:10.1016/j.applthermaleng.2016.05.167

Cited by 28 publications

(2 citation statements)

References 35 publications

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“…The geometry is meshed using the O-block structure by ICEM-CFD to optimize the mesh quality. To balance computing time and accuracy of result, the 3,424,941 cells are chosen in the present simulation since the grid aspect ratio is better to below 5 in the fluent software [12] .…”

Section: Geometrical Modelmentioning

confidence: 99%

Numerical Simulation on Two-Phase Flow Patterns for Water Boiling in Horizontal Heated Tubes

Jingwen¹,

Xue²,

Wang³

et al. 2022

Preprint

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The study of flow pattern in the flow boiling process holds great significance for the safety and automation production in nuclear, aerospace and other industries. A numerical simulation study on flow patterns for water boiling in horizontal heated tubes was conducted by volume of fluid (VOF) multiphase flow model and LEE evaporation-condensation model. And the effect of heat flux on the flow pattern evolution was analyzed. Four boiling flow patterns was obtained in the tubes, namely bubble, slug, annular, and stratified flows. The increment of heat flux pushes the starting point of each flow pattern toward the inlet of the tube, which gradually compresses the range of bubble and slug flow and expands the region of stratified flow. Due to the formation of stratified flow, the tube metal in the upper part is at high temperature, resulting in tube failure.

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Section: Geometrical Modelmentioning

confidence: 99%

Numerical Simulation on Two-Phase Flow Patterns for Water Boiling in Horizontal Heated Tubes

Jingwen¹,

Xue²,

Wang³

et al. 2022

Preprint

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“…TACS performed thermal-hydraulic characteristic analysis on OTSGs with varying thermal and geometric parameters. Niu et al (2016) conducted numerical simulations of uniform single-side heating in pipes using the commercial CFD software FLUENT, based on the VOF and the Realizable k-ε turbulence model. The study explored the thermohydraulic characteristics of flow in helically coiled tubes under different heating conditions.…”

Section: Introductionmentioning

confidence: 99%

Development and preliminary verification of a 1D–3D coupled flow and heat transfer model of OTSG

Lu,

Wang,

Zheng

et al. 2024

Front. Energy Res.

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Introduction: A simulation model was developed by coupling a one-dimensional (1D) system code and 3D CFD software, to analyze the three-dimensional (3D) flow and heat transfer characteristics of the once-through steam generator (OTSG).Methods: The shell side of the OTSG was simulated by FLUENT, and the tube side was simulated by the system code LOCUST. Through spatial mapping, the 1D and 3D simulations were coupled along the outer wall of the OTSG's helically coiled tubes.Results and Discussion: This coupling method enabled the acquisition of high-resolution flow and heat transfer characteristics of the OTSG, and the error of heat flux calculation result by the coupled model is within 15%. Through coupling simulation analysis of the prototype OTSG, it was found that the inlet and outlet temperature difference reached as high as 150°C. The unevenness of the radial temperature distribution increased along the flow direction, and the wake swing effect caused by the sweeping flow of the tube bundle at the exit position was evident. The results of this study provide reference and a coupled simulation method for the engineering design and thermal-hydraulic characteristics analysis of OTSG.

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Numerical Simulation of Flow Boiling Heat Transfer in Helical Tubes Under Marine Conditions

Yuan

Cheng

Bian

et al. 2023

Springer Proceedings in Physics

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Lead-based cooled reactors in most countries and some small reactors at sea use helical tube steam generators. Compared with U-tubes, the convection heat transfer coefficient in the spiral tube is higher, the structure is more compact, and the secondary flow is generated under the action of centrifugal force and gravity, which can achieve the effect of wetting the inner wall of the tube. However, due to the importance of the steam generator in the reactor and the complexity of the flow and boiling in the helical tube, the aggregation behavior of bubbles, the distribution of the two-phase interface and the secondary flow in the tube will significantly affect the heat transfer characteristics, so the gas-liquid phase in the tube is studied. Distribution, changes in heat transfer coefficients, and fluid flow characteristics are very important.In order to study the boiling heat transfer characteristics of helical once-through steam generators under static and marine conditions to provide safe and reliable energy supply for offshore facilities such as marine floating, this study uses STAR-CCM+ software, VOF method and Rohsenow boiling model to study the heat transfer capacity and flow characteristics of flow boiling in a helical tube under swaying and tilting conditions. The gas-liquid phase distribution characteristics, secondary flow variation characteristics and convective heat transfer coefficient of the fluid under different swing functions and inclined positions are obtained by numerical calculation, and the law of physical parameters changing with the cycle is found. The research results show that the secondary flow and heat transfer capacity in the tube change with the cycle, and the change is most obvious at the tube length of 0.8m. 5% of the normal condition; when the inclination angle is 45°, the maximum increase of the convection heat transfer coefficient is 16.8%, and the maximum decrease is 6.6%.

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Numerical simulation on the flow and heat transfer characteristics in the one-side heating helically coiled tubes

Cited by 28 publications

References 35 publications

Numerical Simulation on Two-Phase Flow Patterns for Water Boiling in Horizontal Heated Tubes

Numerical Simulation on Two-Phase Flow Patterns for Water Boiling in Horizontal Heated Tubes

Development and preliminary verification of a 1D–3D coupled flow and heat transfer model of OTSG

Numerical Simulation of Flow Boiling Heat Transfer in Helical Tubes Under Marine Conditions

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