On the theory of radiation-dominated wall-stabilised arcs

Lee, H E; Cram, L. E.

doi:10.1088/0022-3727/18/8/020

Cited by 14 publications

(12 citation statements)

References 15 publications

(26 reference statements)

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“…It has the limits 1 − πx/2 and π/(2x) exp(−x) for small and for large x, respectively. While Lowke [3] evaluated G 1 (x) by a numerical treatment of (4), Lee [25] used series expansions based on modified Bessel functions. For spherical geometry it holds G 1 (x) = exp(−x).…”

Section: Theorymentioning

confidence: 99%

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Net emission coefficients of argon iron plasmas with electron Stark widths scaled to experiments

Wendt¹

2011

J. Phys. D: Appl. Phys.

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The net emission coefficient of plasmas containing argon and iron at atmospheric pressure is calculated and analysed for the case of cylindrical geometry. Its values are obtained by integrating the monochromatic net emission coefficient taking into account continuous and line radiation. The width of the spectral lines is determined by Doppler broadening, natural, resonance, van der Waals, electron and ion Stark broadening. As Stark broadening is the most important broadening mechanism in the considered pressure and temperature range, the electron Stark widths are calculated following the semi-empirical Stark broadening theory. Additionally, the electron Stark widths of Ar, Ar+, Fe and Fe+ are multiplied by scaling factors in order to reproduce experimental electron Stark widths. The scaling factor is determined for each species separately. For small plasma radii the net emission coefficient determined here shows good agreement with literature values where spherical geometry is considered while they decrease faster with increasing plasma radius. This behaviour is caused by the increase of the irradiation of the symmetry axis when cylindrical instead of spherical geometry is considered. For radii and temperatures typical of the metal filled core of arcs occurring in gas metal arc welding processes, i.e. radii between 1 and 2 × 10−3 m and temperatures between 5000 and 10 000 K, the scaling of the Stark widths increases the net emission coefficient of iron plasmas by between 2% and 23%. In this parameter range the net emission coefficient of iron plasmas for cylindrical geometry is between 30% and 37% smaller than values calculated for spherical geometry.

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Section: Theorymentioning

confidence: 99%

“…Considering the collisions of the radiator with different perturber states as statistically independent, an extension of (25) to all possible perturber states reads…”

Section: Line Profile Functionmentioning

confidence: 99%

Net emission coefficients of argon iron plasmas with electron Stark widths scaled to experiments

Wendt¹

2011

J. Phys. D: Appl. Phys.

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“…Research on the application of laser slitting in LIB's CC and the electrode can be divided into mathematical modeling, [ 27 ] high‐speed pulse laser slitting, [ 28 ] laser slitting process strategy, [ 29 ] physical phenomena and slitting efficiency, [ 30 ] the influence of momentum transfer in the slitting process, [ 31 ] and slitting parameter optimization. [ 32 ] With the continuous improvement of the laser slitting technology, the reliability of the slitting quality of the CC and the electrode will be further guaranteed, which is important to improve the reliability of the battery.…”

Section: Specific Approaches To Meet the Requirements Of CCmentioning

confidence: 99%

Significance of Current Collectors for High Performance Conventional Lithium‐Ion Batteries: A Review

Wang

Song

et al. 2023

Adv Funct Materials

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Conventional lithium‐ion batteries (LIBs) are constantly evolving to improve their electrochemical performance and safety. In the past decade, research on electrode and electrolyte materials has significantly promoted the development of conventional LIBs. However, the current collector (CC) in conventional LIBs has not received sufficient attention. As a transfer unit that collects and disperses electrons from electrodes and transports them to the load, the performance of the CC significantly affects the performance of LIBs. This article reviews the impact of the CC on the electrochemical performance and safety of conventional LIBs in four aspects: CC requirements, manufacturing process, surface coating modification, and multifunctionalized CCs. Meanwhile, this review provides an objective summary and prospect on the transition from single‐functionality to multifunctionality requirements for CC, as well as the future needs for CC development and the technical hurdles that should be overcome. The article focuses on providing a detailed insight into the important impact of CCs on conventional LIBs, which has not received enough attention in the past. It emphasizes the need and urgency for the development of multifunctional CCs to provide new ideas for improving the performance of conventional LIBs.

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“…The calculation of the radiation diffusion has been investigated by several authors [1][2][3][4]. However, in practice, three-dimensional calculations of radiation transport are difficult to perform.…”

Section: Introductionmentioning

confidence: 99%

An evaluation of the contribution of radiation diffusion to thermal conductivity in high-pressure discharge lamps from operating-voltage and wall-temperature measurements

Born¹

1999

J. Phys. D: Appl. Phys.

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The contribution of the radiation diffusion κ rad to the thermal conductivity κ in high-pressure discharge lamps is evaluated from operating-voltage and wall-temperature measurements for several cylindrical ceramic discharge tubes filled with mercury and argon as the rare gas. From calculations of κ rad using spectral line data of mercury, it is shown that the electrical conductivity σ can be well represented by a linear function of the heat-flux potential S. Under this assumption, the energy balance can be solved analytically and plasma parameters, i.e. radiation-diffusion and plasma-temperature profiles, can be calculated from the operating voltage and wall temperature without knowledge of spectral lines. The results are in good agreement with numerical calculations of the energy balance involving calculation of the radiation diffusion from spectral line data. The method may also be applied to other buffer gases for which there is a linear dependency of σ (S). This may be checked qualitatively by measurement of the temporal evolution of the operating voltage using the Cassie-Francis equation.

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On the theory of radiation-dominated wall-stabilised arcs

Cited by 14 publications

References 15 publications

Net emission coefficients of argon iron plasmas with electron Stark widths scaled to experiments

Net emission coefficients of argon iron plasmas with electron Stark widths scaled to experiments

Significance of Current Collectors for High Performance Conventional Lithium‐Ion Batteries: A Review

An evaluation of the contribution of radiation diffusion to thermal conductivity in high-pressure discharge lamps from operating-voltage and wall-temperature measurements

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