Identification and prediction of injection bubble shape in MLPS colloidal suspension

•The shape of the bubble is mainly affected by elasticity and appears as “inverted carrot” shape at the beginning of gas injection test, and then becomes “inverted teardrop” shape under the influence of viscoelasticity.•Based on the four newly defined bubble shape parameters, the method of identification for bubble shape is proposed.•A convenient model is proposed to predict the bubble shape at detachment based on the influence parameters.