Study of particle migration and deposition in mixed convective pipe flow of nanofluids at different inclination angles

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Authors

Mahdavi, Mostafa
Garbadeen, I.D.
Sharifpur, Mohsen
Ahmadi, Mohammad Hossein
Meyer, Josua P.

Journal Title

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Publisher

Springer

Abstract

Mixed convection flow of aluminium-oxide nanoparticles in water through a circular tube was modelled using the discrete phase model and implemented on ANSYS-Fluent 17.0 through customised user-defined functions. The inclination angle was varied to study its effect on the migration and deposition of the nanoparticles. Experimentally determined thermo-physical properties were used in the analysis instead of theoretical or empirical models from the literature. Varying inclination angles were found to significantly affect the migration and deposition of nanoparticles. A critical angle of maximum deposition of approximately 30° was found for volume concentrations 1%, 3% and 5%. The effect of varying inclination angle on the heat transfer coefficient was minimal for low angles of inclination between 0 and 35% and decreased significantly after 40%. The effect of Saffman’s lift, thermophoretic, Magnus and Brownian effects were also investigated, and results show that thermophoretic and Brownian effects were most dominant effects.

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Keywords

Nanoparticles, Mixed convection, Discrete modelling, Inclination angle, ANSYS-Fluent, Uuserdefined function (UDF)

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Citation

Mahdavi, M., Garbadeen, I., Sharifpur, M. et al. Study of particle migration and deposition in mixed convective pipe flow of nanofluids at different inclination angles. Journal of Thermal Analysis and Calorimetry 135, 1563–1575 (2019). https://doi.org/10.1007/s10973-018-7720-y.