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motherh
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Homework Statement
I don't fully understand the Reynolds number and it has arisen in a problem. It says:
Fluid with viscosity µ and density ρ fills the gap between two parallel plates at z = 0 and z = h. The upper plate at z = h moves with speed V in the x direction, while the lower plate at z = 0 is stationary. The fluid is also subject to a pressure gradient −G in the x direction.
Homework Equations
I have solved for the velocity u (no idea if this is needed for the Reynolds number bit at all) to find
u(z) = Gz(h-z)/2µ + Vz/h.
The Attempt at a Solution
The question then says:
What is the Reynolds number for this flow? What are the conditions on V and G for it to be small?
Can anybody help at all? It would be much appreciated.
All my notes really say is that Re = ρUL/µ or Re = ρL^2/µT but I don't understand the U, L or the T.