# title
Radiofrequency plasma stabilization of a low-Reynolds-number channel flow

# abstract
<jats:title>Abstract</jats:title><jats:p>The effects of plasma heating and thermal non-equilibrium on the statistical properties of a low-Reynolds-number (<jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:type="simple" xlink:href="S002211201400189X_inline1" /><jats:tex-math>$Re_{	au } = 49$</jats:tex-math></jats:alternatives></jats:inline-formula>) turbulent channel flow were experimentally quantified using particle image velocimetry, two-line planar laser-induced fluorescence, coherent anti-Stokes Raman spectroscopy and emission spectroscopy. Tests were conducted at two radiofrequency plasma settings. The nitrogen, in air, was vibrationally excited to <jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:type="simple" xlink:href="S002211201400189X_inline2" /><jats:tex-math>$T_{vib} sim 1240 mathrm{K}$</jats:tex-math></jats:alternatives></jats:inline-formula> and 1550K for 150W and 300W plasma settings, respectively, while the vibrational temperature of the oxygen and the rotational/translational temperatures of all species remained near room temperature. The peak axial turbulence intensities in the shear layers were reduced by 15 and 30% in moving across the plasma for the 150 and 300W cases, respectively. The plasma did not alter the transverse intensities. The Reynolds shear stresses were reduced by 30 and 50% for the 150 and 300W cases. The corresponding Reynolds shear stress correlation coefficient was also reduced, which indicates that the large-scale structures were diminished. Finally, the plasma enhanced the turbulence decay in the zero-shear regions, where the power law decay <jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:type="simple" xlink:href="S002211201400189X_inline3" /><jats:tex-math>$t^{-1/n}$</jats:tex-math></jats:alternatives></jats:inline-formula> exponential factor <jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:type="simple" xlink:href="S002211201400189X_inline4" /><jats:tex-math>$n$</jats:tex-math></jats:alternatives></jats:inline-formula> decreased from1.0 to0.8.</jats:p>

# authors[].organizations[].label
Texas A&M Engineering Experiment Station (TEES)

# authorList[]
Fuller, T. J., Hsu, A. G., Sanchez-Gonzalez, R., Dean, J. C., North, S. W., & Bowersox, R.