Heat transfer enhancement in suspensions of agitated solids. III. Thermophoretic transport of nanoparticles in the diffusion limit. (English) Zbl 1154.80333
Summary: We illustrate the diffusion limit of wall heat transfer in fluid-solid suspensions by considering small colloidal particles dilute in a liquid at rest. Because such particles are agitated by Brownian motion, their self-diffusivity is modest, the fluid and solid phases share the same temperature, and mixture theory should predict the effective suspension conductivity. We show how thermophoresis creates suspension inhomogeneities, suggest ways to mitigate the latter with ultrasonic forcing, and examine consequences on heat transfer. To inform a debate on nanofluids heat transfer, we show that anomalous conductivity enhancements reported with hot-wire thermal conductimetry can be an experimental artifact of thermophoretic migration along the temperature gradient or timing in the observations.
For part I,II, cf. ibid. 5108–5118 (2008; Zbl 1154.80315); 5119–5129 (2008; Zbl 1154.80316).
For part I,II, cf. ibid. 5108–5118 (2008; Zbl 1154.80315); 5119–5129 (2008; Zbl 1154.80316).
Keywords:
nanofluid heat transfer; thermophoresis; ultrasound; resuspension; hot-wire conductimetry; diffusion limitReferences:
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