This paper reports measured and calculated (through molecular dynamics simulations) latent heat of vaporization (Hfg) for water and ethanol based nanofluids. The experimental results showed that the addition of 3 wt. % Ag and Fe nanoparticles in water results in a substantial reduction in Hfg (25% and 17%, respectively). On the contrary, 3 wt. % Al addition slightly increases Hfg (3%). Similar trends were observed for ethanol based nanofluids: 3 wt. % addition of Ag and Fe resulted in a reduction in Hfg by 19% and 13%, respectively, whereas 3 wt. % Al addition resulted in an increases in Hfg by 2%. Molecular dynamics simulations, which determine Hfg by calculating the total enthalpy change of a system before and after vaporization from a molecular level, showed that the strength of bonding between the nanoparticles and the fluid molecules is the governing factor in the variation of Hfg upon particle addition. It was found that the strength of Al/water bonds was much greater than Ag/water, resulting in a reduction in Hfg for the Ag/water nanofluids.
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Research Article| July 02 2015
Latent heat of vaporization of nanofluids: Measurements and molecular dynamics simulations
S. Tanvir ;
S. Jain ;
S. Tanvir, S. Jain, L. Qiao; Latent heat of vaporization of nanofluids: Measurements and molecular dynamics simulations. J. Appl. Phys. 7 July 2015; 118 (1): 014902. https://doi.org/10.1063/1.4922967
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