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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Sub-60 °c atmospheric helium-water plasma jets: Modes, electron heating and downstream reaction chemistry
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Sub-60 °c atmospheric helium-water plasma jets: Modes, electron heating and downstream reaction chemistry

机译：低于60°c的大气氦-水等离子体射流：模式，电子加热和下游反应化学

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摘要

For plasma treatment of many heat-labile materials (e.g. living tissues) that either are moist or contain a surface layer of liquid, it is desirable that the gas plasma is generated at atmospheric pressure for process convenience and with a gas temperature ideally no more than 60 °C for mitigating permanent damage to the integrity of the test material. This implies that the liquid-containing plasma needs to be of low dissipated electrical energy and that plasma treatment should be based largely on non-equilibrium reaction chemistry. In this paper, a class of sub-60 °C atmospheric helium-water plasma jets is studied in terms of their main physiochemical properties. It is shown that there are five distinct modes appearing in the sequence of, with increasing voltage, the first chaotic mode, the plasma bullet mode, the second chaotic mode, the abnormal glow mode and the non-thermal arc mode. Its chaotic modes may be sustained over a wide range of water vapour concentrations (0-2500 ppm). Compared with other liquid-containing plasmas, the He-H_2O plasma jet operated below its non-thermal arc mode has several distinct advantages, namely very low energy consumption (2-10 νJ per pulse), sub-60 °C gas temperature, electron-modulated production of He, N_2, O*, H and OH(A-X), and low ozone production (0.1-0.4 ppm). These results provide a first attempt at the landscape of the physiochemical characteristics in atmospheric He-H_2O plasma jets.
机译：对于许多湿的或含有液体表面层的不耐热材料（例如，活体组织）的等离子体处理，希望在大气压力下产生气体等离子体，以方便工艺并且理想的气体温度不超过60°C，以减轻对测试材料完整性的永久损坏。这意味着含液体的等离子体需要具有低耗散的电能，并且等离子体处理应主要基于非平衡反应化学。本文研究了一类低于60°C的大气氦-水等离子流的主要理化性质。结果表明，随着电压的升高，第一混沌模式，等离子子弹模式，第二混沌模式，异常辉光模式和非热电弧模式依次出现五个不同的模式。它的混沌模式可以在很宽的水蒸气浓度（0-2500 ppm）范围内维持。与其他含液体的等离子体相比，在非热电弧模式下运行的He-H_2O等离子体射流具有几个明显的优势，即非常低的能耗（每个脉冲2-10νJ），低于60°C的气体温度，电子调节的He，N_2，O *，H和OH（AX）的产生，并且臭氧产生量低（0.1-0.4 ppm）。这些结果为大气He-H_2O等离子体射流的物理化学特征提供了首次尝试。

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