A thermal-stress field calculation method based on the equivalent heat source for the dielectric fitting under discharging

Yang, Fan; Li, Kai; Wang, Shaohua; Gao, Bing; Ai, Shaogui; Zheng, Xuejun; Le, Yanjie; Uilah, Irfan

doi:10.1016/j.applthermaleng.2018.04.057

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…Therefore, the entropy form of the energy conservation of the arc plasma satisfies Equation (3), where the viscous dissipation is Equation (4). The arc plasma is in equilibrium and satisfies the gas state equation shown in Equation (5) [ 16 , 25 ].

where ρ is density, V is arc plasma flow velocity, p is pressure, μ f is viscosity coefficient, S is deformation tensor, J is current density, B is the magnetic induction, T is temperature, s is entropy, Φ is viscous dissipation term, λ T is thermal conductivity, σ is electrical conductivity, μ 0 is magnetic permeability, ɛ is surface conductivity, σ s is the Steffen–Boltzmann constant, T 0 is ambient temperature, p 0 is one standard atmospheric pressure, and R is the gas constant.…”

Section: Mhd Models and Experimentsmentioning

confidence: 99%

Section: Mhd Governing Equations and Boundary Conditionsmentioning

confidence: 99%

“…Mohanty, U.K. et al [ 23 ] proposed an overlapping double ellipsoid heat source model to simulate the thermal behavior of the AC square wave arc welding process. Liu, K. et al [ 24 , 25 ] equated the small-gap DC arc in the oil and gas pipeline to two heat sources: the arc ellipsoid and the Gaussian surface heat source. Li, Y. et al [ 26 ] established a plasma EHS model based on the geometry of the molten pool to study the keyhole mode welding process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on an Equivalent Heat Source Model of the AC Arc in the Short Gap of a Copper-Core Cable and a Fire Risk Assessment Method

Li,

Zhang,

Yang

et al. 2024

Sensors

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The magnetohydrodynamics (MHD) model of the alternating current (AC) arc is complex, so a simplified equivalent heat source (EHS) model can be used to replace the complex model in studying the AC arc’s thermal characteristics and cable fire risk. A 2D axisymmetric AC arc MHD simulation model in the short gap of a copper-core cable is established in this paper. The AC arc voltage and current obtained by the model are consistent with experiments. The AC arc’s heat source distribution obtained by the MHD model is fitted to obtain the heat source function Q of the AC arc. Q is divided into 16 independent segmented heat sources, and a correction matrix is constructed to optimize the segmented heat sources. A neural network and a genetic algorithm give the prediction model and the optimal correction matrix of the segmented heat source. The EHS model optimized by the optimal correction matrix can obtain a minimum temperature error of 5.8/4.4/4.2% with the MHD model in different AC arc peak currents 2/4/6 A. The probability of a cable fire is calculated by using AC arc’s optimized EHS model when different numbers of AC arcs are generated randomly in AC half-waves. The EHS model can replace the complex MHD model to study the thermal characteristics of AC arcs and quickly calculate the probability of a cable fire caused by random AC arcs.

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Section: Mhd Models and Experimentsmentioning

confidence: 99%

Section: Mhd Governing Equations and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on an Equivalent Heat Source Model of the AC Arc in the Short Gap of a Copper-Core Cable and a Fire Risk Assessment Method

Li,

Zhang,

Yang

et al. 2024

Sensors

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Numerical study on instantaneous heat transfer characteristics of AC arc-fault

Yang

Zhang

et al. 2021

AIP Advances

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Studying the heat transfer characteristics of alternating current (AC) arc-fault to electrodes is a key issue in electrical fires. In this paper, an instantaneous heat transfer numerical model of AC arc-fault is developed based on the magneto-hydrodynamic principle. The temperature distribution of the AC arc at the microseconds level and the influence of heat transfer on electrodes at the seconds level when the arc heats are studied. The numerical simulation of the axial temperature of the electrodes is verified by experiments, and the temperature variation in the electrodes at different currents and times is discussed. The results show that the arc temperature varies periodically similar to the current at the microseconds level but it does not go out when the current passes zero. The high-temperature region of electrodes diffuses with the increase in current or time. However, the axial temperature gradient of the electrode decreases with time and increases with current. Furthermore, the range of temperature increase in the electrode position decreases with the increase in current and time, but the electrode position near the arc has a higher initial temperature increase.

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Coupling numerical simulation of plasma arc channel evolution and particle dispersion process

Zhang,

Yuan,

Tang

et al. 2024

Physics of Fluids

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Arc discharge plasma (ADP) technology can be applied to disperse easily aggregated materials, such as the carbon nanotubes and Fe3O4. To investigate the evolution of the plasma arc channel and particle dispersion effect during the ADP process, a coupled electrode–plasma channel–workpiece (Fe3O4 clusters) and particle dispersion heat transfer model was established. The simulation results exhibited that the plasma arc formed at 0.05 s acted on the workpiece surface, forming a conical bottle-shaped structure with a wide arc column near the workpiece region and a narrow arc column near the electrode region due to the plasma column–workpiece interaction. With the continuous discharge, a discharge crater was formed on the workpiece surface due to the thermal-pressing effect of the plasma arc, and the dynamic pressure exerted by the arc column on the workpiece center increased continuously, driving the dispersion of the particles. In addition, ADP dispersion experiments were carried out on Fe3O4 to verify the simulation results. The experimental results showed that the morphologies of plasma arc channel evolution and discharge crater agreed with the simulation results. Moreover, the Fe3O4 particles dispersed by the ADP showed good dispersion morphology, which will further promote the spread of ADP technology in the dispersion and application of materials.

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A thermal-stress field calculation method based on the equivalent heat source for the dielectric fitting under discharging

Cited by 5 publications

References 30 publications

Research on an Equivalent Heat Source Model of the AC Arc in the Short Gap of a Copper-Core Cable and a Fire Risk Assessment Method

Research on an Equivalent Heat Source Model of the AC Arc in the Short Gap of a Copper-Core Cable and a Fire Risk Assessment Method

Numerical study on instantaneous heat transfer characteristics of AC arc-fault

Coupling numerical simulation of plasma arc channel evolution and particle dispersion process

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