By Viswanatha Sharma Korada, Nor Hisham B Hamid
This e-book specializes in using nanotechnology in numerous fields of engineering. between others, the reader will locate important info as to how nanotechnology can reduction in extending the lifetime of part fabrics uncovered to corrosive atmospheres, in thermal fluid power conversion techniques, anti-reflection coatings on photovoltaic cells to yield improved output from sun cells, in reference to friction and put on aid in cars, and buoyancy suppression in unfastened convective warmth move. in addition, this designated source provides the most recent learn on nanoscale delivery phenomena and concludes with a glance at most probably destiny trends.
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Extra info for Engineering Applications of Nanotechnology: From Energy to Drug Delivery
The correlation between Eqs. (20) and (21) is reported to be in good agreement with the experimental data. knf =kw ¼ ð0:9692£ þ 0:9508Þ ð20Þ lnf =lw ¼ ð1:005 þ 0:497£ À 0:1149£2 Þ ð21Þ Experiments are conducted for the determination of nanofluid viscosity prepared by dispersing Al2O3 nanoparticles of size <50 nm for application as a coolant in a commercial vehicle by Kole and Dey (2010). The experiments are conducted in the temperature range of 10–80 °C. Newtonian behaviour is observed for nanofluid at volume concentrations lower than 4 % and non-Newtonian behaviour at higher concentrations in the range of temperature measured.
Namburu et al. (2007) conducted experiments to compare the viscosity of SiO2 (20, 50, and 100 nm) nanoparticles suspended in ethylene glycol (EG) and water mixture in the ratio of 60:40 by weight in the concentration range of 0–10 % and temperature of −35 to +50 °C. It is observed that SiO2 nanofluid dispersed with 100-nm-sized particles at 8 % concentration has the lowest viscosity. Godson et al. 9 % volume concentration and temperature of 50–90 °C. The effect of Brownian motion and thermophoresis on the thermophysical properties is discussed.
11 Difference between steric and electrostatic stabilization (Yu and Xie 2012) adapted by permission economical method of preparing stable nanofluids. The surface tension of the liquid is abated and the particle engagement is escalated in the host fluid by the introduction of surfactants. A rise in zeta potential is obtained due to increase in repulsive force generating from the particle surface. The hydrophobic surfaces of the nanomaterials in aqueous-based nanosuspensions are modiﬁed into hydrophilic surface.