The role of interfacial layers in the enhanced thermal conductivity of nanofluids : a renovated Hamilton-Crosser model.
We previously developed a renovated Maxwell model for the effective thermal conductivity of nanofluids and determined that the solid/liquid interfacial layers play an important role in the enhanced thermal conductivity of nanofluids. However, this renovated Maxwell model is limited to suspensions with spherical particles. Here, we extend the Hamilton--Crosser model for suspensions of nonspherical particles to include the effect of a solid/liquid interface. The solid/liquid interface is described as a confocal ellipsoid with a solid particle. The new model for the three-phase suspensions is mathematically expressed in terms of the equivalent thermal conductivity and equivalent volume fraction of anisotropic complex ellipsoids, as well as an empirical shape factor. With a generalized empirical shape factor, the renovated Hamilton-Crosser model correctly predicts the magnitude of the thermal conductivity of nanotube-in-oil nanofluids. At present, this new model is not able to predict the nonlinear behavior of the nanofluid thermal conductivity.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; EE
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 961406
- Report Number(s):
- ANL/ET/JA-47454
- Journal Information:
- J. Nanoparticle Res., Journal Name: J. Nanoparticle Res. Journal Issue: 4 ; Aug. 2004 Vol. 6; ISSN 1388-0764
- Country of Publication:
- United States
- Language:
- ENGLISH
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