Liquid bridge is often formed in transformer

oil-water separator and electric demulsifier under the action of electric field. The discharge phenomenon caused by the liquid bridge has a great influence on the normal operation and service life of equipment. In order to study the process and development of droplet bridging under a uniform DC electric field

a visual experimental system was designed and built. A number of experiments were carried out by changing the droplet size and voltage

and three types of liquid bridges

namely

columnar liquid bridge

pearl chain liquid bridge

and column cap liquid bridge

were observed. In the columnar liquid bridge phenomenon

a long liquid column connects the upper and lower plates

but the duration is short. After the liquid bridge broken

a large droplet is formed between the plates. In the phenomenon of pearl chain liquid bridge

a number of droplets are connected in series like a pearl necklace and last for a long time. There will be electric sparks between adjacent droplets. The discharge will lead to the breakup of droplet bridge and the formation of bubbles. In the columnar cap liquid bridge phenomenon

the short liquid column is connected with the large droplet placed on the lower plate

and the short liquid column breaks up quickly and lasts for a short time.