For what it's worth...
What I got from Mike's article is that the boundary layer restricts the flow. In a circular cross-section, the flow is higher in the middle. I also deduced that this would be similar in non-circular channels. Turbulence is wanted for improved heat dissipation. Putting it all together, what we want is turbulence at, or near the boundary layer.
Upon closer examination, it seems that the turbulence provided by high speed flow alone, doesn't fit with what's needed to improve cooling.
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