Liquid removal device and liquid removal method

A liquid removal device that removes liquid attached to a surface of a steel sheet, the liquid removal device comprising:

• a slit nozzle that jets gas from a jetting port to the surface of the steel sheet;
• and
• a gap measurement device that measures a gap between the jetting port of the slit nozzle and the steel sheet,
• wherein the slit nozzle is installed so as to jet gas from a downstream side toward an upstream side in a. movement direction of the steel sheet that moves relatively to the slit nozzle,
• the movement direction of the steel sheet is a horizontal direction, and
• the slit nozzle satisfies the following relational formulas:
• P
• n
• ≥
• 2.0
• ×
• 10
• 10
• ⁢
• (
• h
• ⁢
• /
• ⁢
• d
• )
• 0.6
• ⁢
• (
• 1
• 1
• +
• exp
• ⁡
• (
• β
• +
• θ
• -
• 58
• )
• +
• 1
• )
• 4
• ⁢
• L
• -
• 7
• ,
• β
• +
• θ
• ≥
• 60
• ⁢
• °
• ,
• 100
• ⁢
• ⁢
• mm
• ⁢
• ≥
• L
• ≥
• 20
• ⁢
• ⁢
• mm
• ,
• [
• Math
• .
• ⁢
• 1
• ]
• where gas pressure inside the slit nozzle is defined as nozzle pressure Pn [KPa],
• an angle formed by a direction perpendicular to the surface of the steel sheet and a jet direction of the gas is defined as a jet angle θ [°],
• an angled formed by the jet direction of the gas and a nozzle back face that is a face disposed from the jetting port of the slit nozzle toward the downstream side in the movement direction is defined as a back face inclination angle β[°],
• a length of the nozzle back face in the movement direction is defined as L [mm],
• the gap is defined as h [mm], and
• a slit width of the slit nozzle is defined as d [mm].