According to 150 t ladle with double holes bottom argon blowing at steel works

based on similarity principle a water model with geometric ratio 1 ：5 is established to get the liquid surface bared area

change rule of steel-slag entrapment condition and critical slag entrapment blowing gas rate for prototype ladle and optimum ladle with corresponding to real argon blowing rate 260-600 L/min. Research results show that for prototype scheme- two gas permeable bricks distance from ladle center 0.64 R and 0.76 R

two holes angle 90° (0.64 R +0.76 R

90° ) the critical slag entrapment blowing gas rate is 550 L/min； for two optimum schemes-two holes distance from ladle center 1/3 R and 0.64 R

two holes angle 180° (1/3 R +0.64 R

180°) and two holes distance from ladle center 0.5 R with angle 135° (0.5 R +0.5 R

135°)

the critical slag entrapment blowing gas rate is respectively 550 L/min and 600 L/min.