71.
Discharges with liquid nonmetallic electrodes of much interest for applications are investigated. It is found that a dc discharge between two streams of tap water in air at atmospheric pressure is stable at a currentof 40≤
I≤100 mA. The discharge exists in the diffuse (volume) form with a relatively low current density (∼0.2 A/cm
2) and a high (above one kilovolt) voltage drop across the air gap (∼1 cm) between the water electrodes. The current density and voltage depend only slightly on the discharge current. Probe measurements show that three regions can be distinguished in the discharge: two electrode regions (1–2 mm in length) and a discharge column with a constant electric field of ≈0.8 kV/cm (i.e.,
E/N≈20 Td, because the gas in the discharge is heated up to 1500–2000 K). The average electric field strength near the electrodes is
E≈2–3×10
3 V/cm (
E/N≈60–80 Td). The charged particle density in the column is
n ∼ 10
12 cm
−3. The probe measurements of
n agree with the previous microwave absorption measurements. The water vapor concentration in the column is also estimated from probe measurements.
相似文献