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Reduced Density Fluctuation Level at Higher Electrode Bias is Consistent with Increased ExB Shear
Biasing range explored so far with DBS: UE ≤ 2.5 kV
(expect larger shearing rates at higher electrode bias)
Turbulence suppression criterion*:
Dwt is the turbulence decorrelation rate:
Dwt =(2p/tAC)F(vExB,Wb)
Dwt ~4x105 rad/s~wExB forUE=2.3kV
wExB > Dwt
1.0 r-Rs = - 0.05 m τAC ~ 1.8 μs
0.5 0 -0.5
-6 -4 -2 0 2 4 6 Δt (μs)
More substantial ñ reduction likely at higher UE!
Rs
*Biglari, Diamond, Terry Phys. Fluids B2 (1990)
HTPD Conference 2020 Presenter: Lothar Schmitz
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C[(ñ(t),ñ(t+Δt)]