Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
651623 | Experimental Thermal and Fluid Science | 2014 | 10 Pages |
Abstract
The heat transfer coefficients of nanofluids can be compared with those of the base fluids at the same Reynolds number or at the same pumping power. As the same Reynolds number requires higher flow rate of nanofluids therefore such comparison shows up to 15% increase in heat transfer coefficient. However, at equal pumping power, the heat transfer coefficient of Al2O3 nanofluid was practically the same as that of water while that of TiO2 was about 10% lower. Comparing performance at equal Reynolds number is clearly misleading since the heat transfer coefficient can always be increased by increased pumping power, accordingly, the comparison between the fluids should be done at equal pumping power.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Ehsan B. Haghighi, Adi T. Utomo, Morteza Ghanbarpour, Ashkan I.T. Zavareh, Heiko Poth, Rahmatollah Khodabandeh, Andrzej Pacek, Björn E. Palm,