In this paper, the dynamics and flow behaviour of an atmospheric argon plasma jet was studied in the new nozzle structure similar to the surface dielectric barrier discharge (SDBD) using the Schlieren imaging method. The effect of plasma jet driven by repetitive high‐voltage microsecond pulses with low‐frequency sinusoidal bias was measured qualitatively in a single mirror Schlieren optical system. The enhancement of plasma jet length and cross‐section of plasma jet with surface in this condition is due to highly turbulent flow of argon plasma jet in this structure. This study revealed the important role of SDBD structure and modulated electric field on the behaviour of plasma jet in a high diameter nozzle. In practice, this technique allows us to increase the jet length of the nozzle output to 5 cm and under these conditions, the diameter of the plasma jet cross‐section is increased to 8 mm, without increasing the electrical power consumption. Eventually, the hydrophilicity of the surface is also measured by the contact angle of a water droplet that decreases from 78° to 8° after surface treatment, implying we were able to reach a super‐hydrophilic surface with this plasma jet structure.

中文翻译：

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调制电场对表面改性的SDBD类等离子体射流特性的影响

在本文中，使用Schlieren成像方法，在类似于表面介电势垒放电（SDBD）的新型喷嘴结构中研究了大气氩等离子体射流的动力学和流动行为。在单镜Schlieren光学系统中定性地测量了由具有低频正弦偏置的重复高压微秒脉冲驱动的等离子流的效果。在这种情况下，等离子流长度和带有表面的等离子流横截面的增加是由于这种结构中氩气等离子流的高度湍流。这项研究揭示了SDBD结构和调制电场对大直径喷嘴中等离子流行为的重要作用。实际上，这项技术使我们可以将喷嘴输出的射流长度增加到5厘米，在这种情况下，等离子流横截面的直径增加到8 mm，而不会增加电耗。最终，表面的亲水性还可以通过表面处理后水滴的接触角（从78°减小到8°）来衡量，这意味着我们能够通过这种等离子流结构达到超亲水性表面。