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- W2910189742 abstract "In this work, a study to evaluate the effect of the concentration of nanoparticles of an Al2O3/water nanofluid on the capillary limit of a heat pipe with a screen mesh wick was performed. For the first time, a numerical model has been developed to couple the hydrodynamical equations that describe the flow and the phase change of the working fluid in the wick of a screen mesh heat pipe, with a population balance which account for the agglomeration of Al2O3 nanoparticles and the deposition of them on the surface of the wick. The model has been validated with experimental data of temperature and capillary limit. Experimental results showed that capillary limit is reached at higher heat input when nanoparticles are added to the working fluid. The best improvement of the capillary limit was around 30–40%. At high nanoparticle concentration, the improvement of the capillary limit was more variable, and the thermal resistance was higher than even the working fluid without nanoparticles. The improvement of the capillary limit has been found to be due to the modification of the wettability of the wick instead of reduction of effective pore radius or enhancing of the thermal conductivity. Numerical results fitted in good agreement the experimental data, but some limitations were found when high nanoparticle concentration was simulated because model can not predict the non-uniform deposition observed at microscopic level. Finally, it was found that there is an optimal concentration of nanoparticles to delay the occurrence of capillary limit. In this work, that optimal concentration was Al2O3/water 0.5% w/w." @default.
- W2910189742 created "2019-01-25" @default.
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- W2910189742 date "2019-04-01" @default.
- W2910189742 modified "2023-10-14" @default.
- W2910189742 title "Population balance for capillary limit modeling in a screen mesh wick heat pipe working with nanofluids" @default.
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- W2910189742 doi "https://doi.org/10.1016/j.ijthermalsci.2018.12.015" @default.
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