Experimental and numerical investigation of heat transfer in CNT nanofluids
Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01 wt%, stabilised by 1.0 wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis
2013
|
| Subjects: | |
| Online Access: | http://irep.iium.edu.my/36777/1/Experimental_and_numerical_investigation_of_heat_transfer_in_CNT_nanofluids.pdf http://irep.iium.edu.my/36777/ http://www.tandfonline.com/doi/abs/10.1080/17458080.2013.848296 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01 wt%, stabilised by 1.0 wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The flow rate of cold fluid varied from 10 to 50 g/s. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT nanofluids. Computational fluid dynamics (CFD) simulations were carried out using Fluent v 6.3 by assuming single-phase approximation. Thermal conductivity, density and rheology of the nanofluid were also measured as a function of temperature. The results showed thermal conductivity enhancement from 4% to 125% and nearly 70% enhancement in heat transfer with increase in flow rate. Numerical results exhibited good agreement with the experimental results with a deviation of 3%. CNT nanofluids at 0.01 wt% CNTs showed Newtonian behaviour with no significant increase in the density. |
|---|