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Fluid mechanics and hydraulics miscellaneous

Fluid Mechanics and Hydraulics

  1. The drag force, FD on sphere kept in a uniform flow field depends on the diameter of the sphere, D; flow velocity, V, fluid density, ρ; and dynamic viscosity, μ. Which of the following options represents the non-dimensional parameters which could be used to analyze this problem?
    1. FD
      and
      μ
      VDρVD
    2. FD
      and
      ρVD
      ρVD²μ
    3. FD
      and
      ρVD
      ρV²D²μ
    4. FD
      and
      μ
      ρV³D³ρVD
Correct Option: C


= (dimensionless parameter)

ρVD
= Re (reynold’s number) which is dimensionless
μ



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