Abstract
In this paper, we investigate the effect of adding a stabilizer on the dynamic thermal properties of ZnO nanofluid (containing 5 to 10 nm diameter of ZnO nanocrystals) measured using a 3ω method. Addition of the stabilizer leads to the stabilization of the nanofluid and also substantial reduction of the enhancement of thermal transport compared to that seen in the bare ZnO nanofluid. This also alters the frequency dependence of the thermal transport and the characteristic time scale associated with it. It is suggested that the addition of the stabilizer inhibits the thermodiffusion-assisted local aggregation thus leading to substantial reduction of the enhancement of thermal transport properties of the bare nanofluid as proposed in some recent models, and this also alters the characteristic time scales by altering the scale of aggregation.
Highlights
IntroductionNanofluids are dispersions of nanoparticles (typically sizes approximately 5 to 20 nm) in liquid medium
Nanofluids are dispersions of nanoparticles in liquid medium
We find that the frequency dependence of Cpκ in bare ZnO nanofluid gets quantitatively modified when the stabilizer is attached
Summary
Nanofluids are dispersions of nanoparticles (typically sizes approximately 5 to 20 nm) in liquid medium In recent years, they have attracted considerable attention due to enhanced heat transport properties as seen through enhanced thermal conductance [1,2]. A number of mechanisms have been proposed that could be responsible for the enhancement of the thermal conductivity They include the (a) Brownian motion of the nanoparticles [5,6], (b) molecular-level layering of the liquid at the liquid-particle interface [7], (c) ballistic heat transport in nanoparticles [8], and (d) local clustering of nanoparticles [9,10]. There is no accepted theory/mechanism that can explain all the observations adequately
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