The energy flux of a nanosecond pulsed cold atmospheric pressure (CAP) plasma jet in contact with a substrate surface was measured to improve the understanding of the correlation between energy flux, flow dynamics and applied electrical power. The flow pattern properties of the CAP jet were imaged using Rayleigh scattering showing a transition from laminar to turbulent flow at Reynolds number of 700, significantly smaller than the conventional critical Reynolds number of 2040. The energy flux to the surface was determined using a passive thermal probe as a substrate dummy. As expected, the energy flux decreases with increasing distance to the nozzle. Measurements of the floating potential of the probe revealed a strong positive charging (up to 165 V) attributed to ion flux originating mainly from Penning ionization by helium metastables. Negative biasing of the probe doubled the energy flux and showed a significantly increased ion contribution up to a nozzle distance of 6 mm to the surface. For positive biasing an increased contribution of electrons and negative ions was only found at 3 mm distance. The relevance of particle transport to the surface is shown by switching from laminar to turbulent flow resulting in a decreased energy flux. Furthermore, a linear correlation of energy flux and input power was found.

测量与基板表面接触的纳秒脉冲冷大气压 (CAP) 等离子体射流的能量通量，以提高对能量通量、流动动力学和施加的电功率之间相关性的理解。CAP 射流的流型特性使用瑞利散射成像，显示雷诺数为 700 时从层流到湍流的转变，明显小于传统的临界雷诺数 2040。流向表面的能量通量是使用被动热确定的探针作为基板假人。正如预期的那样，能量通量随着到喷嘴的距离增加而减少。探针浮动电位的测量显示强正电荷（高达 165 V）归因于主要源自氦亚稳态的 Penning 电离的离子通量。探针的负偏压使能量通量加倍，并且在喷嘴距表面 6 毫米的距离内显示出显着增加的离子贡献。对于正偏置，仅在 3 毫米距离处发现电子和负离子的贡献增加。通过从层流切换到湍流导致能量通量降低，可以显示粒子传输与表面的相关性。此外，发现了能量通量和输入功率的线性相关性。通过从层流切换到湍流导致能量通量降低，可以显示粒子传输与表面的相关性。此外，发现了能量通量和输入功率的线性相关性。通过从层流切换到湍流导致能量通量降低，可以显示粒子传输与表面的相关性。此外，发现了能量通量和输入功率的线性相关性。