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Which dimensionless parameter is zero in the nondimensionalized Navier-Stokes equation when the flow is quasi-steady? (a) Euler number (b) Prandtl number (c) Froude number (d)

Which dimensionless parameter is zero in the nondimensionalized Navier-Stokes equation when the flow is quasi-steady?

(a) Euler number

(b) Prandtl number

(d) Strouhal number

(e) Reynolds number

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