If the viscosity of a fluid increases, the velocity boundarylayer formed over a surface becomes:
Correct answer: A. More
- A. More
- B. Less
- C. No effect
- D. Unpredictable
Explanation
Higher viscosity enhances momentum diffusion from the wall into the flow, producing a thicker boundary layer compared with lower-viscosity fluids.
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Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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