3. To match the Reynold’s number in an air flow and water flow using the same size model, which flow will require the higher flow speed? How much higher must it be? vair= 3.51x10-5 m2/s; vwater= 1.00x10-6 m2/s, where v is the kinematic viscosity

To develop this problem we will apply the principle of dimensional similarity between water and air. Later we will leave the speed units defined in terms of the kinematic viscosity to finally contrast the magnitude of difference between them with the given values. Reynolds number can be defined as,

Here,

= Density

V = Velocity of flow

L = length

= Dynamic viscosity

For dimensional similarity we have,

Here means the kinematic viscosity, then replacing with our values

Therefore the velocity of air is higher than velocity of water by 35.1 times

car a and b are moving in opposite directions

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explanation: