An air curtain was designed according to the jet theory of fluid mechanics and the role and feature of air curtain to separate dust in a fully mechanized face.

The fluid flow and transportation behavior of non-metal inclusion were studied in tundish of gas curtain dam by water model experiment and PW system.

The invention discloses a gas-fluid exchange method and a device for carrying out bidirectional convection self-excitation liquid curtain in an inclined rectangular pipeline.