Effects of hybrid nanofluid mixture in plate heat exchangers

Summary, in English

Heat transfer and pressure drop characteristics of a hybrid nanofluid mixture containing alumina nanoparticles and multi-walled carbon nanotubes (MWCNTs) were experimentally investigated in a chevron corrugated-plate heat exchanger. A MWCNT/water nanofluid with a volume concentration of 0.0111% and an Al2O3/water nanofluid with a volume concentration of 1.89% were mixed at a volume ratio of 1:2.5. A small amount of MWCNTs was added in order to increase the mixture thermal conductivity. Experiments with water used as both hot and cold fluids were carried out first to obtain a heat transfer correlation for fluids flowing in the chevron plate heat exchanger. The results of the nanofluid mixture were compared with those of the Al2O3/water nanofluid and water. Results show that the heat transfer coefficient of the hybrid nanofluid mixture is slightly larger than that of the Al2O3/water nanofluid and water, when comparison is based on the same flow velocity. The hybrid nanofluid mixture also exhibits the highest heat transfer coefficient at a given pumping power. The pressure drop of the hybrid nanofluid mixture is smaller than that of the Al2O3/water nanofluid and only slightly higher than that of water. Therefore, hybrid nanofluid mixtures might be promising in many heat transfer applications.

• Author: Dan Huang; Zan Wu; Bengt Sundén
• Department/s: Heat Transfer; Department of Energy Sciences
• Publishing year: 2016
• Language: English
• Pages: 190-196
• Publication/Series: Experimental Thermal and Fluid Science
• Volume: 72
• Links: http://dx.doi.org/10.1016/j.expthermflusci.2015.11.009
• Document type: Journal article
• Publisher: Elsevier
• Topic: Nano Technology; Energy Engineering
• Status: Published
• Research group: heat transfer
• ISBN/ISSN/Other: ISSN: 1879-2286