通过LTE (局部热力学平衡) 和2-T (两温度) 弧形模型预测的阳极弧连接在一个级联阳极DC等离子喷雾火中
Rodion Zhukovskii1, Christophe Chazelas1, Vincent Rat1
1CNRS, IRCER, UMR 7315, Université de Limoges, 87000 Limoges, France.
概括
通过比较等离子体火模型,两温度 (2-T) 模型准确地预测了扩散阳极弧附着,与局部热力学平衡 (LTE) 模型不同. 这一发现对于理解和减轻DC等离子体喷雾火中阳极侵蚀至关重要.
科学领域:
- 等离子体物理学和工程
- 材料科学和表面工程 材料科学和表面工程
- 热喷雾技术的技术热喷雾技术.
背景情况:
- 阳极侵蚀是DC等离子喷雾火的一个重大挑战,主要受到弧热流和附着特性的影响.
- 阳极表面的弧附着方式对其尺寸,居住时间和随后的侵蚀产生了重大影响.
研究的目的:
- 为了比较由局部热力学平衡 (LTE) 和两温度 (2-T) 弧形模型预测的阳极弧附着模式.
- 为了评估这些模型在特定操作条件下模拟商业级联阳极等离子体火的准确性.
主要方法:
- 利用计算流体动力学 (CFD) 与弧形模型将电极纳入领域.
- 在500A电流和60NLPM流速下模拟了一个级联阳极等离子火.
- 将模型预测与测量弧电压和死后阳极观测进行了比较.
主要成果:
- LTE模型预测了一个狭窄的,移动的阳极弧附件.
- 2-T模型预测了一个分散的,稳定的阳极弧附着.
- 2-T模型的弧电压预测与实验测量非常相匹配.
结论:
- 与LTE模型相比,2-T弧模型为研究的等离子火提供了更准确的阳极弧附件表示.
- 在新阳极的死后观察到的扩散弧附着证实了2-T模型的预测.
- 精确模拟弧附着对于预测和减少等离子体喷雾应用中的阳极侵蚀至关重要.
相关概念视频
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
602
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
602
Atomic Emission Spectroscopy: Overview
2.1K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
2.1K
Atomic Emission Spectroscopy: Instrumentation
379
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
379
Atomic Emission Spectroscopy: Lab
161
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
161
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
215
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
215
Atomic Absorption Spectroscopy: Radiation and Light Sources
388
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
388


