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Based on the volume of fluid (VOF) method,a numerical model of bubbles splitting in a microfluidic device with T-junction is developed and solved numerically.Various flow pattes are distinguished and the effects of bubble length,capillary number,and diameter ratio between the mother channel and branch are discussed.The break-up mechanism is explored in particular.The results indicate that the behaviors of the bubbles can be classified into two categories:break-up and non-break.Under the condition of slug flowing,the branches are obstructed by the bubbles that the pressure difference drives the bubbles into break-up state,while the bubbles that retain non-break state flow into an arbitrary branch under bubbling flow condition.The break-up of the short bubbles only occurs when the viscous force from the continuous phase overcomes the interfacial tension.The behavior of the bubbles transits from non-break to break-up with the increase of capillary number.In addition,the increasing of the diameter ratio is beneficial to the symmetrical break-up of the bubbles.