سال انتشار: ۱۳۸۷

محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو

تعداد صفحات: ۲

نویسنده(ها):

G. R. Vakili-Nezhaad – Institute for Nanoscience & Nanotechnology, University of Kashan, Kashan
A Dourani –

چکیده:

Nanofluids are solid-liquid mixtures consisting of the solid nanoparticles or nanofibers with particle size<100 nm in suspension in a continuous and saturated liquid [1]. Nanofluids have attracted much attention since their anomalously large enhancement in thermal properties [2] but there are only a few published articles on deriving the effective viscosity of nanofluids from experimental and theoretical point of views [3]. Masuda et al [4] were likely the first to measure the viscosity of several water based nanofluids for temperatures ranging from room temperature to 67ºC. Pak and Cho [5] followed by viscosity data obtained for Al2O3-water nanofluids at two particle concentrations. Wang et al [6] measured the viscosity of Al2O3-water nanofluid and showed that nanofluids have lower viscosity when the particles are more dispersed and they also found an increase of ~30% in viscosity at 3 vol% Al2O3 compared with that of water alone. However, viscosity of the Al2O3-water nanofluid prepared by Pak and Cho was three times higher than that of the water. As expected the viscosity of nanofluids depends on the method used to disperse and stabilize the nanoparticle suspension [5]. Among the various nanofluids, carbon nanotube suspensions have specific importance because of the considerable enhancement of the heat transfer performance compared to pure oil [2]. In direction of these efforts variations of the viscosity of MWCNT based nanofluids have been the subject of some recent researches. Also in this work the kinematic viscosity of various MWCNTs/oil nanofluids has been investigated over various concentration and temperature ranges