Abstract: The magnetic field， flow field and temperature field in the CSP funnel type mold with a size of 1500mm×90mm were calculated by numerical simulation， and the influences of electromagnetic brake(EMBr) on the behavior of flow and heat transfer of molten steel with different submerged entry nozzle(SEN) in the CSP mold were researched. The results show that the impinging depth of steel jet is shortened in the mold with cow-nose nozzle when the EMBr is employed， and the maximum velocity in the free surface is decreased from 0.231m/s to 0.067m/s. The upswept trend of liquid steel mainstream disappears under the influence of EMBr when the bifurcated nozzle is adopted. The impinging strength of steel jet on the narrow side of mold is weakened. The velocity of molten steel in the upper circumfluence is reduced. The maximum velocity in the free surface decreases from 0.798m/s to 0.140m/s. Comparing synthetically the influences of EMBr on the behavior of fluid flow and heat transfer with the two kinds of SEN， the braking effect is better under the condition of bifurcated nozzle， and the quality of thin slab is improved.

Key words: CSP funnel type mold, submerged entry nozzle(SEN), electromagnetic brake, numerical simulation