The Effect of Magnetic Field Intensity on the Ionic Flow and Its Convective Heat Transfer Over a Flat Surface

Francis Steward, Mclaren Stewart (2024) The Effect of Magnetic Field Intensity on the Ionic Flow and Its Convective Heat Transfer Over a Flat Surface. Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

By investigating the convective cooling of a flat surface by an ionic wind produced from a needle-to-wire configuration in the presence of varying magnetic force values, i.e., 180 N, 250 N, and 800 N, as well as a changing polarity of applied voltage to the emitting electrode, i.e., +12 kV and -12 kV, it was found that the peak velocity values for the positive and negative ionic flows were observed to be 0.95 m/s and 0.90 m/s, respectively, which occurred when a magnetic force of 800 N was applied. It was also shown that the overall positive ionic flow velocity values were also significantly higher than the negative flow velocity values, and that the presence of a magnetic field was shown to have manipulated the ionic wind flow distribution by shifting the flow in the direction of the electromagnet. Furthermore, the highest heat transfer enhancement factor and ratio for both positive and negative ionic wind types were 1.08 and 8.14%, and 1.12 and 12.31%, respectively, which occurred when the respective 800N and 0N magnets were used. In short, there was no conclusive evidence to show heat transfer over a flat surface was enhanced under the presence of a magnetic field.