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Spreading dynamics of liquid droplets impacting onto powder bed are experimentally studied using high-speed photography. Dimensionless numbers— We ,  Re , the modified  We *   and  Re  ∗  corrected by substrate deformation—are used to analyze the impact behaviors of droplets. The spreading time and the maximum spreading factor are further analyzed. The spreading time is accurately described by a universal scaling law that is obtained from the modified dimensionless time vs. the effective Weber number ( We  ∗ ), and the maximum spreading factor is found to follow the modified classic scaling law  β  max  =  f ( We  * ,  Re  * ).

Experimental study of liquid droplets impact on powder surface: The application of effective dimensionless parameters in analysis