turbulent drag reduction of polyacrylamide solutions in america

turbulent drag reduction of polyacrylamide solutions in america
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  • Does a drag reducing polymer reduce turbulence?
  • Conventional turbulence, e.g., as in a Newtonian fluid, is driven by inertial effects. Adding drag-reducing polymers damps those turbulent motions and coerces the flow to a state of less disorderness and, consequently, less drag. This has been the storyline dominating DR research for decades and has also been the narrative of this review thus far.
  • Do polyacrylamide and superhydrophobic surfaces reduce drag?
  • Experimental results indicate that, prior to degradation, polyacrylamide (at a 100-ppm concentration) and superhydrophobic surfaces individually manifest drag reductions of 35% and 7%, respectively.
  • Which polymer is most effective at reducing drag?
  • The most effective drag-reducing polymer molecules are linear long chains with flexible backbones, 5–8 although rigid polymers are also known to cause DR. 9,10 The phenomenon of polymer-induced turbulent DR has been continuously studied for seven decades since its discovery, and findings were extensively reviewed in the literature.
  • Is Polymer-Induced drag reduction a problem?
  • The problem of polymer-induced drag reduction has attracted continuous attention over the seven decades since its discovery. However, changes in research paradigm and perspectives have triggered a wave of new advancements in the past decade.