Los nanofluidos son soluciones coloidales de partículas de tamaño nanométrico (metales, óxidos metálicos o nanotubos de carbono) en un fluido base (polar o apolar). Los nanofluidos poseen propiedades interesantes que los hacen útiles especialmente en el diseño de equipos de transferencia de calor más compactos. En el presente trabajo se estudia el proceso de convección laminar de un nanofluido (agua, Al2O3) al interior de un ducto cuadrado y un tubo circular mediante el software ANSYS/FLUENT 12.1. Se presentan resultados para el número de Nusselt, el factor de fricción, perfiles de temperatura y velocidad para cuatro concentraciones volumétricas de nanopartículas (<img border=0 src="/img/revistas/dyna/v83n196/v83n196a16eq002.gif"> = 0 - 20%) y números de Reynolds (Re=800, 1300 y 2000). Para los Re estudiados, Nu disminuye un 12% y 10% cuando <img src="/img/revistas/dyna/v83n196/v83n196a16eq002.gif">aumenta de 0% a 10% y de 10% a 20%, respectivamente. En el caso del coeficiente de fricción, el valor obtenido aumenta alrededor de un 30% cuando <img border=0 src="/img/revistas/dyna/v83n196/v83n196a16eq002.gif">es aumentado un 10%.

Nanofluids are colloidal suspensions of nanometer-sized particles (metals, metallic oxides or carbon nanotubes) in a base fluid (polar or non-polar). Nanofluids have interesting properties that make them useful especially in the design of compact heat transfer equipment. Laminar convective heat transfer of nanofluids (water, Al2O3) in a square and circular ducts has been studied numerically using the software ANSYS/FLUENT 12.1. Results for the Nusselt number, skin coefficient friction, temperature and velocity profiles are presented for four nanoparticle volume fractions (<img src="/img/revistas/dyna/v83n196/v83n196a16eq002.gif"> = 0 - 20%) and Reynolds numbers (Re = 800, 1300 and 2000). For the studied Re numbers, Nu is decreased by 12% and 10%, when <img border=0 src="/img/revistas/dyna/v83n196/v83n196a16eq002.gif">is increased from 0% to 10% and from 10% to 20%, respectively. Regard to the skin friction factor, the obtained value is increased around a 30% when <img border=0 src="/img/revistas/dyna/v83n196/v83n196a16eq002.gif">is increased 10%.

Abstract Experiments and modeling aimed at assessing the mechanical response of latex balloons in the inflation test are presented. To this end, the hyperelastic Yeoh material model is firstly characterized via tensile test and, then, used to numerically simulate via finite elements the stress-strain evolution during the inflation test. The numerical pressure-displacement curves are validated with those obtained experimentally. Moreover, this analysis is extended to a biomedical problem of an eyeball under glaucoma conditions.