Basically you have to understand the Turbulence model based on the Reynolds number.
Reynolds number is defined as
[tex]Re = \frac{\rho v L}{\mu}[/tex]
Where
[tex]\rho[/tex] = Density
v = Velocity
L = Linear dimension
[tex]\mu =[/tex] Dynamic Viscosity
This last term is the characteristic of the fluids given above for comparison.
From there we can intuit that the lower the viscosity the greater the Reynolds number and therefore there will tend to be more turbulence.
Of the four fluids presented we have to
Water [tex]\rightarrow 8.90*10^{-4} Pa\cdot s[/tex]
Motor oil [tex]\rightarrow [/tex] From 0.085 to [tex]0.9 Pa\cdot s[/tex]
Air [tex]\righarrow 1.81*10^{-5} Pa\cdot s[/tex]
Honey [tex]\rightarrow 10 Pa\cdot s[/tex]
The minimum value is for the Air. Therefore there you will expect turbulent mixing to happen most easily. Correct Answer is C.
