The effect of changing the position of the hot wall and increasing the amplitude and number of oscillations of wavy wall on the flow and heat transfer of nanofluid inside the channel in the presence of magnetic field

Authors

1 PHD student, Faculty of Engineering, University of yazd

2 Department of Mechanical Engineering, Yazd University, Yazd, Iran

Abstract

In this paper, the effect of changing position of heat source on nanofluid heat transfer under the influence of magnetic field in the wavy channel with variable amplitude and number of oscillations is investigated by Lattice Boltzmann Method. A uniform magnetic field is applied perpendicular to the channel. The first half of the upper channel wall, wavy form with the amplitude and number of variable oscillations at constant cold temperature, and the half of the bottom channel with variable position, are at constant hot temperature. Other walls are insulated for heat and mass. In this study, the effect of parameters such as Reynolds number, nanoparticle volume fraction, Hartmann number, hot wall position and amplitude and number of wavy wall oscillations were evaluated. The results show that at a specific position location of the hot wall, the average Nusselt number increases with the increase of other parameters. The highest heat transfer also occurs when the hot wall is closer to the channel inlet that results in an average 20% increase in the Nusselt number. The effect of increasing the Hartmann number on heat transfer is greater when the hot wall is closer to the channel outlet. Increasing the percentage of nanoparticles increases heat transfer and this effect increases with decreasing Reynolds number.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 10, Issue 2
June 2020
Pages 219-236

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