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This module introduces the fundamentals of fluid dynamics as they relate to gravity-fed metalcasting gating systems. It explains how fluid flow behavior affects casting quality, including common defects associated with improper flow. Key principles such as Bernoulli’s equation and the Law of Continuity are used to illustrate relationships in gating design. The module also describes the effects of momentum, turbulence, and alloy fluidity on mold filling and highlights design features that help reduce flow-related issues. (0.1 CEU)