MHD effect on Nanofluid Flow and Heat transfer in Backward-Facing Step using two-phase Model

Content Provider	Semantic Scholar
Author	Mobadersani, F. Hesari, Araz Rezavand
Copyright Year	2019
Abstract	Magneto hydrodynamics (MHD) effects on nanofluid flow in backward-facing step is studied using twofluid model of Buongiorno. Due to the utilization of two-phase model, variable nanoparticle concentration and nanofluid properties are considered. Thermophoresis and Brownian diffusivities are calculated in particle dispersion. Effects of Reynolds number, particle volume fraction, magnetic field and Hartmann numbers are studied on heat transfer and fluid flow characteristics. It is shown that introduction of nanoparticles as a second phase, pushes reattachment point further into the downstream, while magnetic field has opposite effect and pushes it backward into the upstream. Particles are shown to be migrating from hot to cold regions due to the dispersion mechanisms considered. In comparison to single phase models, there is 3.7% decrease in maximum Nusselt number and more than 40% difference in the reattachment point location. Accuracy of the reattachment point is shown through previous pure fluid studies, the comparison to which show less than 0.8% tolerance with most recent studies. Relative effect of diffusion mechanisms is compared in different flow conditions, which show up to 12.5% difference. Application of magnetic field results in average Nusselt number increase of more than 10% by Hartmann number of 12.
Starting Page	41
Ending Page	50
Page Count	10
File Format	PDF HTM / HTML
DOI	10.22060/ajme.2019.14843.5747
Volume Number	4
Alternate Webpage(s)	https://ajme.aut.ac.ir/article_3433_391f26325cf98bd74ec4b36af1d4689c.pdf
Alternate Webpage(s)	https://doi.org/10.22060/ajme.2019.14843.5747
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article