An electrostatic scheme realizing the complete interception of fog droplets by corona discharge-induced ion wind

Abstract

The interception of fog is of great significance for industrial production and human activities. Owing to the simple structure and convenient installation, the fog mesh is widely adopted to intercept droplets in industrial and practical applications. However, the interception mechanism and requirements in high droplet concentration, result in a low inherent interception efficiency. Therefore, a novel method that can completely intercept fog droplets and enhance the local droplets number concentration by changing the direction of fog entering the electric field by using ion wind, is put forward in this paper. Experimental results show that the introduction of ion wind can improve the interception efficiency to reach nearly 100%. In addition, the droplets number concentration near the ground mesh electrode can reach two times of the initial number concentration. The experiment also studied the optimal interception voltage under different electrode spacing, which is meaningful to guide the industrial application of using ion wind to intercept droplets. This method can completely intercept the fog droplets, and further reduce the lower limit of the fog concentration required by the fog mesh to intercept droplets.

Electrification of water: From basics to applications

“…137 Apart from charging the collector, charging the droplets could also promote fog collection. Using a corona emitter to spatially electrify the fog droplets (i.e., conduction electrification), the charged droplets are repulsed by the emitter to overcome the aerodynamic drag force (Figure 5a) [138][139][140] and directly propelled toward the collector. Such a method could result in the collection of approximately 30 mL of water within 30 min, which is in striking contrast to its counterpart without the use of electricity (Figure 5b).…”

Ionic Wind Driven Fog Collection in Windless Environment

“…21 Ionic wind generated by the corona discharge process was used to intercept the fog stream and capture fog droplets. 22,23 Corona discharge and cooling have been coupled to harvest the fog and water vapor in the wet flue gas. 24 The deposition efficiency depends on the Stokes number.…”

“…An active fog collection approach by using the corona discharge and electric field has recently attracted much attention. − Droplets in the fog are charged by the corona discharge, and the deposition efficiency can be greatly enhanced (>1.0) by the electric field . A field experiment demonstrated that an electrostatic fog collector provides a 60% better fog collection rate than a standard mesh-like fog collector .…”

“…An overall fog collection efficiency of more than 90% was reported by using pillar arrays as the collection electrodes and wires as the repelling electrodes . Ionic wind generated by the corona discharge process was used to intercept the fog stream and capture fog droplets. , Corona discharge and cooling have been coupled to harvest the fog and water vapor in the wet flue gas …”

Dividing and setting strategy of improving calculation efficiency for needle electrode corona discharge with a large‐scale space

“…Corona discharge, as a common gas discharge, has been widely used in industrial production and biological technologies, such as material processing [1–4], energy conversion [5–7], environmental governance [8–12], aerospace [13, 14] and agricultural food [15, 16]. Owing to the sharp tip, the needle electrode is always a preferred and favoured structure as the discharge electrode to study the discharge characteristics [17].…”