This study investigates the development of snow accretion shapes on conductors by considering accretion rates dependent on the collision angle of snow particles, and evaluates their aerodynamic characteristics. Snow accretion experiments were conducted in a low-temperature wind tunnel to establish a model in which the accretion rate varies with collision angle. The rate can be conveniently approximated by a quadratic function, reaching its maximum when particles collide perpendicularly and decreasing to zero beyond a critical angle. Aerodynamic coefficients for conductors with estimated snow accretion reveal that, even with low accretion height, galloping is more pronounced during growth than with higher accretion—particularly under high Reynolds number conditions.
