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Effect of a Polymer Additive on Heat Transport in Turbulent Rayleigh-Benard Convection Guenter Ahlers and Alexei Nikolaenko
 

Summary: Effect of a Polymer Additive on Heat Transport in Turbulent Rayleigh-Be┤nard Convection
Guenter Ahlers and Alexei Nikolaenko
Department of Physics, University of California, Santa Barbara, California 93106, USA
(Received 15 October 2009; published 21 January 2010)
Measurements of heat transport, as expressed by the Nusselt number Nu, are reported for turbulent
Rayleigh-Be┤nard convection of water containing up to 120 ppm by weight of poly-[ethylene oxide] with a
molecular weight of 4 ┬ 106 g=mole. Over the Rayleigh number range 5 ┬ 109 & Ra & 7 ┬ 1010 Nu is
smaller than it is for pure water by up to 10%.
DOI: 10.1103/PhysRevLett.104.034503 PACS numbers: 47.27.te
It has been known for about six decades that minute
quantities of a polymer dissolved in a fluid can signifi-
cantly reduce the drag experienced by turbulent flows near
solid surfaces (see, for instance, [1,2]). During this time,
literally thousands of papers have been written about this
technologically important problem. However, we are not
aware of any experimental study, and know of only a single
very recent theoretical investigation [3], of the influence of
polymer additives on turbulent convection in a fluid con-
fined between horizontal parallel plates and heated from
below (known as Rayleigh-Be┤nard convection or RBC). In

  

Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara

 

Collections: Physics