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BH40A1453 Fluid Mechanics II - Blended teaching 3.3.2025-20.4.2025
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In Buckingham PI theorem a dimensionless parameter, like angle of attack α,
With Buckingham Π theorem a good choice for repeating parameters is often in fluid mechanics
With Buckingham Π theorem number of variables due to Π groups
Circular cylinder with diameter 2 mm (von Karman vortices) is open to wind speed 10 m/s ( = 1510-6 m2/s). The frequency is (Hint: calculate Re_d and look from chart Strouhal Sr value)
When Mach number Ma is less than 0.3, gas flow can be considered as
Froude number Fr is ratio of
y+ means
Reynolds number for pipe flow can defined
w is velocity, is density, d is pipe diameter, is viscosity (kg/ms), is kinematic viscosity (m2/s), qm is mass flow rate and Q is volume flow rate
In calculation of the pipe flow is used a chart with dimensionless groups (f, Re, ε/D). It is called
The most important dimensionless group in fluid mechanics is