Convective diffusion from strip-like micro-probes into colloidal suspensions

Wein, O.

doi:10.1016/j.ijheatmasstransfer.2010.01.003

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…On the other hand, there are processes with a dominant microscopic length scale, such as small Nernst diffusion thickness in heat/mass transfer [ 13 ], small hydraulic radius in microfluidics [ 14 - 17 ], small pore diameter in filtration [ 5 ], etc., where the bulk rheology characteristics should be completed using another kind of information. In some cases, two-scale description (particle size or inter-particle distance vs. hydraulic radius) is useful [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Stability and rheology of dilute TiO2-water nanofluids

2011

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The apparent wall slip (AWS) effect, accompanying the flow of colloidal dispersions in confined geometries, can be an important factor for the applications of nanofluids in heat transfer and microfluidics. In this study, a series of dilute TiO2 aqueous dispersions were prepared and tested for the possible presence of the AWS effect by means of a novel viscometric technique. The nanofluids, prepared from TiO2 rutile or anatase nanopowders by ultrasonic dispersing in water, were stabilized by adjusting the pH to the maximum zeta potential. The resulting stable nanofluid samples were dilute, below 0.7 vol.%. All the samples manifest Newtonian behavior with the fluidities almost unaffected by the presence of the dispersed phase. No case of important slip contribution was detected: the Navier slip coefficient of approximately 2 mm Pa-1 s-1 would affect the apparent fluidity data in a 100-μm gap by less than 1%.

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