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Natural convection of microparticle suspensions in thin enclosures. (English) Zbl 1255.76003
Summary: Natural convection experiments are performed with aluminum oxide microparticle aqueous suspensions in thin enclosures of circular planform at angles of inclination to the horizontal of 90\(^\circ \), 30\(^\circ \) and 0\(^\circ \). The average size of the aluminum oxide particles is about 250 nm, and volume fractions of 1.31% and 2.72% are used. The aspect ratio varies from 50.7 to 10.9, and the maximum Raleigh number was \(3 \times 10^{5}\). No effect of particles on the Nusselt number-Rayleigh number relation is found for the vertical enclosure at 90\(^\circ \). However at 30\(^\circ \) and 0\(^\circ \) (horizontal) there is a decrease in Nusselt number compared to pure water, which is pronounced at lower Rayleigh number and higher particle concentrations. This anomalous behavior is attributed to sedimentation.

MSC:
76-05 Experimental work for problems pertaining to fluid mechanics
76R10 Free convection
80A20 Heat and mass transfer, heat flow (MSC2010)
76T20 Suspensions
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