The laminar sub region occurs in Ο Α Laminar region B Transient region Ос All of the above OD Turbulent region
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Laminar sublayer
The laminar sublayer, also called the viscous sublayer, is the region of a mainly-turbulent flow that is near a no-slip boundary and in which the flow is laminar. As such, it is a type of boundary layer. The existence of the laminar sublayer can be understood in that the flow velocity decreases towards the no-slip boundary. Because of this, the Reynolds number decreases until at some point the flow crosses the threshold from turbulent to laminar.
The laminar sublayer is important for river-bed ecology: below the laminar-turbulent interface, the flow is stratified, but above it, it rapidly becomes well-mixed. This threshold can be important in providing homes and feeding grounds for benthic organisms.
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