This paper reports an experimental work on the viscosities of 30% (in volume) ethylene glycol water solution based nanofluids, and presents a critical analysis of the experimental reports on thermal conductivity and dynamic viscosity in terms of the mechanism of aggregation and show that, by manipulating the morphology of the aggregates, the first-best trade-off between the thermal conductance and rheological behavior of general nanofluids can be approximately achieved. Attempt to regulate the viscosity of nanosized SiO2 suspensions was made following a semi-empirical method named particle grading.

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