Threshold velocity for the collisional growth of porous dust aggregates consisting of cohesive frictionless spheres

Understanding the collisional outcomes of dust aggregates and dependence on material properties constituting particles is great importance toward understanding planet formation. Recent numerical simulations have revealed that interparticle tangential friction plays a crucial role in energy dissipation during collisions between porous aggregates; however, growth remains poorly understood. Here we demonstrate effects aggregates. We performed equal-mass consisting cohesive frictionless spheres. changed collision velocity impact angle systematically calculated efficiency as function velocity. found threshold for decreases when are made spheres compared to frictional Our results highlight interactions behavior indicate predictive equation should be reconstructed.