This book presents the rheological and thermal properties and the freeze-thaw characteristics of nanofluids. Nanofluids are dispersions of nano-scale particles (< 100 nm) in a base fluid such as water and glycols. In cold regions, a mixture of 60% ethylene glycol and water by mass (60:40 EG/W) is normally used as the heat transfer fluid due to its low freezing point. Rheological properties of aluminum oxide nanofluid in the EG/W base fluid were investigated and new correlations for viscosity as a function of temperature and particle concentration were developed. From the specific heat experiments on zinc oxide nanofluid a new equation was developed. The thermal conductivity of silicon dioxide nanofluid was measured. A new correlation for thermal conductivity as a function of particle concentration, size, base fluid and particle properties and temperature was proposed, considering the Brownian motion of nanoparticles. Freeze-thaw characteristics of copper oxide nanoparticle dispersions in water were studied experimentally and computationally for a freeze-thaw cycle. The freezing rate, agglomeration of nanoparticles and the effect on the freezing point of nanofluid were summarized.
Mr. Bhaskar Sahoo received his MS degree in geological engineering at the University of Alaska Fairbanks, USA and is currently pursuing a Ph.D. degree at York University, Canada. Dr. Debendra Das was the advisor of Mr. Sahoo and the past Chairman of mechanical engineering department at the University of Alaska Fairbanks.
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LAP LAMBERT Academic Publishing
nanofluids, freeze, thaw, viscosity, thermal conductivity, specific heat, ethylne glycol
TECHNOLOGY / Engineering / General