[Technical Information] Viscosity of Molten Metal

This is an introduction to the viscosity of molten metal, including the dynamic viscosity of various liquids.

Casting involves pouring liquid metal into a mold, and if the viscosity resistance increases, it will take longer to fill the mold, with the possibility of solidifying along the way. The viscosity of a liquid is represented by a numerical value known as the viscosity coefficient (symbol η) in physics. In the case of liquid flow, the viscosity resistance is influenced not only by the viscosity coefficient but also by the density (symbol ρ). The value obtained by dividing η by ρ (known as kinematic viscosity or kinematic coefficient, symbol ν) is given by ν = η / ρ, and it is a key factor governing viscosity resistance. Since the value of η for molten metal is originally small and combined with a high ρ, the value of ν becomes extremely small. [Kinematic Viscosity ν (10^-2 × cm²/s)] ■ Water: 1 ■ Ethyl Alcohol: 1.5 ■ Steel: 0.5 ■ Cast Iron: 0.7 ■ Copper: 0.4 *For more details, please refer to the PDF document or feel free to contact us.

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