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Heat transfer and flow behaviour of aqueous suspensions of titanate nanotubes (nanofluids)
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Chen, Haisheng, Yang, Wei, He, Yurong, Ding, Yulong, Zhang, Lingling, Tan, Chunqing, Lapkin, Alexei and Bavykin, Dmitry. (2008) Heat transfer and flow behaviour of aqueous suspensions of titanate nanotubes (nanofluids). Powder Technology, Vol.183 (No.1). pp. 63-72. ISSN 0032-5910
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Official URL: http://dx.doi.org/10.1016/j.powtec.2007.11.014
Abstract
Titanate nanotubes of an aspect ratio of ~ 10 are synthesized, characterised and dispersed in water to form stable nanofluids containing 0.5, 1.0 and 2.5 wt.% of the nanotubes. Experiments are then carried out to investigate the effective thermal conductivity, rheological behaviour and forced convective heat transfer of the nanofluids. The results show a small thermal conductivity enhancement of ~ 3% at 25 °C and ~ 5% at 40 °C for the 2.5 wt.% nanofluid. The nanofluids are found to be non-Newtonian with obvious shear thinning behaviour with the shear viscosity decreasing with increasing shear rate at low shear rates. The shear viscosity approaches constant at a shear rate higher than ~ 100–1000 s− 1 depending nanoparticle concentration. The high shear viscosity is found to be much higher than that predicted by the conventional viscosity models for dilute suspensions. Despite the small thermal conduction enhancement, an excellent enhancement is observed on the convective heat transfer coefficient, which is much higher than that of the thermal conductivity enhancement. In comparison with nanofluids containing spherical titania nanoparticles under similar conditions, the enhancement of both thermal conductivity and convective heat transfer coefficient of the titanate nanotube nanofluids is considerably higher indicating the important role of particle shape in the heat transfer enhancement. Possible mechanisms are also proposed for the observed enhancement of the convective heat transfer coefficient.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics T Technology > TP Chemical technology |
| Divisions: | Faculty of Science > Engineering |
| Library of Congress Subject Headings (LCSH): | Heat -- Transmission, Rheology, Nanofluids, Titanates, Nanotubes |
| Journal or Publication Title: | Powder Technology |
| Publisher: | Elsevier S.A. |
| ISSN: | 0032-5910 |
| Date: | March 2008 |
| Volume: | Vol.183 |
| Number: | No.1 |
| Number of Pages: | 10 |
| Page Range: | pp. 63-72 |
| Identification Number: | 10.1016/j.powtec.2007.11.014 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Description: | Selected papers from the UK-China Particle Technology Forum; Leeds UK, 1-3 April 2007 |
| Funder: | Zhongguo ke xue yuan. Gong cheng re wu li yan jiu suo [Chinese Academy of Sciences. Institute of Engineering Thermophysics] (CAS), Engineering and Physical Sciences Research Council (EPSRC) |
| Grant number: | EP/D000645 (EPSRC), EP/D000564 (EPSRC) |
| URI: | http://wrap.warwick.ac.uk/id/eprint/37170 |
Data sourced from Thomson Reuters' Web of Knowledge
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