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← ScienceWhich risk increases when molten steel injection meets a cold mold?
A)Turbulent flow dominates laminar flow✓
B)Fluid surface tension reaches sub-zero
C)Alloying element evaporation reduces tensile strength
D)Metal erosion increases at the gate
💡 Explanation
Turbulence may increase because a lower temperature reduces viscosity. The **Reynolds number** increases, changing the dominant flow regime; therefore, it is turbulent rather than remaining purely laminar upon initial injection; temperature affects this phase transition.
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