Because when the Reynold's number is less than 2000 in the laminar zone the fluid is not moving fast enough to create eddies. Doesn't matter how dense it is.
Look at a Moody Nomograph and the equations for details.
That's actually a good answer and furthermore, not off topic. I'm not allowed to vote othgerwise I would reward you as such.
Energy cannot be created nor destroyed (both by Mother Natures's Laws AND by science). This seems to be what the OP is attempting to do (dissipate fluid kinetic energy which as yet does not exist).
One way around this problem would be to add energy to the fluid sufficient to pass out of the laminar zone, through transition, and into the turbulence region. Once there, he can now proceed to waste away this energy through eddy currents and waste heat.
This is the reason I asked.
According to tenekes&lumley (isbn-10: 0262200198), "Turbulence is not a feature of fluids but of fluid flows." This means, I would imagine, turbulence is independent of the fluid density which is a fluid property.
Furthermore, they say that "A common source of energy for turbulent velocity fluctuations is shear in the mean flow" Shear in the mean flow is dependent on fluid density via the stokes theorem..
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I OTed it because even if true, it doesn't really explain anything; i.e., assist in understanding the phenomenon. Not all "why" questions are meaningful.
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Fluid Flow Question
Re: fluid flow question
