The simulation test on bottom blowing oxygen parameters (bottom blowing rate 0. 2 ~ 0. 56 m

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bath height 120 ~ 330 mm) and flow field of liquid in a 100 kg medium frequency induction furnace is carried out by a geometric similarity ratio 1: 1 water model. The results show that the change of velocity of gas phase flow formed in bottom blowing bath in vertical direction is not obvious

but there is large velocity gradient in horizontal direction ； with increasing bath height and bottom blowing rate the gas phase velocity gradient increases and the vertical gas-liquid two phase flow upward movement is modified to out of the perpendicular； as bath height H less than 240 mm and gas flow rate Q less than 0. 56 m

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with increasing bath height and bottom flow rate the mixing time decreases

and beyond these scope the variation of mixing time is not obvious.