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← ScienceWhich outcome results when fluid viscosity increases within an industrial paint sprayer?
A)Reduced nozzle spray cone angle✓
B)Increased droplet evaporation rate
C)Higher pump motor efficiency
D)Diminished pigment settling rate
💡 Explanation
Increased viscosity causes a larger boundary layer at the nozzle exit because viscous forces dominate, influencing momentum transfer via increased internal friction rather than inviscid effects. Therefore, a narrow spray cone results, rather than smaller droplets from faster breakup.
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