Multiphysics Simulation of Welding-Arc and Nozzle-Arc System: Mathematical-Model, Solution-Methodology and Validation

Pawar, Sumedh; Sharma, Atul

doi:10.1007/s40032-017-0430-6

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…■ Solving a complex multiphysics model can make the simulation not applicable for quick tests. Entering the local h on the inner pipe's surface as a function of temperature, (27) → (28) based on a full-scale simulation, is an alternative since the processing time was reduced from 24 h to 1 h, 46 min. The lower time was achieved by reducing the model size to ¼ of the pipe diameter and the number of elements from 1305219 to 187758.…”

Section: Discussionmentioning

confidence: 99%

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Multiphysics Simulation of In-Service Welding and Induction Preheating: Part 1

CORREA RIFFEL,

GONÇALVES E SILVA,

RAMIREZ

et al. 2024

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A finite element model was developed using a multiphysics finite element analysis (FEA) coupling heat transfer, fluid flow, and electromagnetic heating. Part 1 presents the software implementation and model equations beside the mesh setting and modeling approach to simulate circumferential welding of Type B sleeve repair. The simulation was divided into four steps running sequentially for each physic solved in the model. Induction preheating was simulated and validated by comparing simulated temperature with experimental measurements. The multiphysics model differs from the usual simulations present in the literature, expressing more reliability in the results and making way for more-complete modeling for in-service applications.

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Section: Discussionmentioning

confidence: 99%

“…This first simulation was used to set up and converge the induction heating running coupled with the nonisothermal flow since the complexity of the multiphysics model requires a step-by-step approach, as also used in other multiphysics models in the literature (Refs. [25][26][27].…”

Section: Multiphysics Model For In-service Welding Qualificationmentioning

confidence: 99%

Multiphysics Simulation of In-Service Welding and Induction Preheating: Part 1

CORREA RIFFEL,

GONÇALVES E SILVA,

RAMIREZ

et al. 2024

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“…Therefore, it is essential to investigate the arc ablation and the breakdown properties of these nozzles and to develop better nozzle materials to solve or mitigate the above problems. In recent years, many studies on the arc model and establishing the dynamic properties of gases during the breaking process of the circuit breaker have been carried out [10][11][12][13][14][15], but few works have focused on the investigation of the ablation and breakdown properties of nozzles. Our previous work superficially studied the arc ablation resistance and breakdown properties of nozzle materials by filling BN of different sizes into PTFE [16,17].…”

Section: Introductionmentioning

confidence: 99%

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Zhao¹,

Nie²,

Zhao³

et al. 2021

Energies

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The substantial improvements in transmission voltage, which have been adopted to meet fast-growing energy demands, require more reliable power equipment and higher-quality insulating materials. The polytetrafluoroethylene (PTFE) nozzle, as the key part of a high-voltage circuit breaker, is often subjected to arc ablation and breakdown phenomena. Thus, it is very urgent to develop nozzles with better performance. In this study, PTFE/boron nitride (BN) composites were prepared. The relationships among the BN filler loading, thermal transition properties, spectral reflectance properties, arc ablation resistance, and AC dielectric breakdown performances, as well as their corresponding mechanisms, were studied. Experimental results show that the thermal conductivity and thermal diffusivity of PTFE/BN composites increased monotonously with BN loading, and that both parameters were improved by 41% and 44%, respectively, for 11 wt % composites compared with pure PTFE. Moreover, PTFE/BN composites had higher light reflectance in the wavelength range from 320 to 2500 nm. The PTFE/BN composites presented better arc ablation resistance performance with increased BN loading, which was improved by 88.5%. It is thought that the increased thermal conductivity, thermal diffusivity, the strong light reflectance, and surface sediment after arc ablation contribute to the improvement in arc ablation resistance performance. The AC breakdown strength of PTFE/BN composites was enhanced by 30.93%, attributed to the good heat dissipation properties introduced by the BN fillers. Thus, filling BN into the PTFE matrix would be helpful to solve the equipment issue that comes from the improvement in transmission voltage.

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Multiphysics Simulation of Welding-Arc and Nozzle-Arc System: Mathematical-Model, Solution-Methodology and Validation

Cited by 2 publications

References 16 publications

Multiphysics Simulation of In-Service Welding and Induction Preheating: Part 1

Multiphysics Simulation of In-Service Welding and Induction Preheating: Part 1

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

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