Asymptotes of maximum friction and heat transfer reductions for drag-reducing surfactant solutions

Guillermo Aguilar Mendoza, Kazimir Gasljevic, Eric F. Matthys

Resultado de la investigación: Contribución a una revistaArtículo

46 Citas (Scopus)

Resumen

A new maximum drag reduction asymptote (MDRA) for surfactant solutions is presented. Various concentrations including cationic and non-ionic surfactant solutions were used to experimentally determine this asymptote. It is shown that if solvent viscosity is used to compute Reynolds and Prandtl numbers for viscous solutions, it leads to underestimations of the friction coefficient. To avoid uncertainties in the selection of the fluids viscosity, most solutions used were intentionally conditioned so their shear viscosity was water-like in the ranges covered. Using the same solutions, a maximum heat transfer reduction asymptote (MHTRA) was also determined - a correlation that did not exist for surfactants until now. Finally, by using slightly modified definitions to quantify the heat transfer and drag reductions (TRH and TRD), it is possible to express the ratio between the MHTRA and MDRA with a constant value of 1.06, independent of Reynolds number. This relationship can be used as an auxiliary criterion to determine whether or not a solution is asymptotic when there is an uncertainty about the shear viscosity.

Idioma originalInglés
Páginas (desde-hasta)2835-2843
Número de páginas9
PublicaciónInternational Journal of Heat and Mass Transfer
Volumen44
N.º15
DOI
EstadoPublicada - 8 jun 2001

Huella dactilar

asymptotes
Surface-Active Agents
drag
Drag
Surface active agents
friction
heat transfer
surfactants
Friction
Heat transfer
drag reduction
Drag reduction
viscosity
Shear viscosity
Reynolds number
Viscosity
shear
Nonionic surfactants
Prandtl number
coefficient of friction

Citar esto

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Asymptotes of maximum friction and heat transfer reductions for drag-reducing surfactant solutions. / Aguilar Mendoza, Guillermo; Gasljevic, Kazimir; Matthys, Eric F.

En: International Journal of Heat and Mass Transfer, Vol. 44, N.º 15, 08.06.2001, p. 2835-2843.

Resultado de la investigación: Contribución a una revistaArtículo

TY - JOUR

T1 - Asymptotes of maximum friction and heat transfer reductions for drag-reducing surfactant solutions

AU - Aguilar Mendoza, Guillermo

AU - Gasljevic, Kazimir

AU - Matthys, Eric F.

PY - 2001/6/8

Y1 - 2001/6/8

N2 - A new maximum drag reduction asymptote (MDRA) for surfactant solutions is presented. Various concentrations including cationic and non-ionic surfactant solutions were used to experimentally determine this asymptote. It is shown that if solvent viscosity is used to compute Reynolds and Prandtl numbers for viscous solutions, it leads to underestimations of the friction coefficient. To avoid uncertainties in the selection of the fluids viscosity, most solutions used were intentionally conditioned so their shear viscosity was water-like in the ranges covered. Using the same solutions, a maximum heat transfer reduction asymptote (MHTRA) was also determined - a correlation that did not exist for surfactants until now. Finally, by using slightly modified definitions to quantify the heat transfer and drag reductions (TRH and TRD), it is possible to express the ratio between the MHTRA and MDRA with a constant value of 1.06, independent of Reynolds number. This relationship can be used as an auxiliary criterion to determine whether or not a solution is asymptotic when there is an uncertainty about the shear viscosity.

AB - A new maximum drag reduction asymptote (MDRA) for surfactant solutions is presented. Various concentrations including cationic and non-ionic surfactant solutions were used to experimentally determine this asymptote. It is shown that if solvent viscosity is used to compute Reynolds and Prandtl numbers for viscous solutions, it leads to underestimations of the friction coefficient. To avoid uncertainties in the selection of the fluids viscosity, most solutions used were intentionally conditioned so their shear viscosity was water-like in the ranges covered. Using the same solutions, a maximum heat transfer reduction asymptote (MHTRA) was also determined - a correlation that did not exist for surfactants until now. Finally, by using slightly modified definitions to quantify the heat transfer and drag reductions (TRH and TRD), it is possible to express the ratio between the MHTRA and MDRA with a constant value of 1.06, independent of Reynolds number. This relationship can be used as an auxiliary criterion to determine whether or not a solution is asymptotic when there is an uncertainty about the shear viscosity.

KW - Asymptotes

KW - Drag reduction

KW - Heat transfer reduction

KW - Surfactants

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