Viscous Drag Force and Heat Transfer from an Oscillating Micro-Wire
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An experimental apparatus is being developed in order to investigate heat and momentum transfer from oscillating surfaces submerged in various fluids. A fine wire is situated in a magnetic field and immersed in a fluid of interest. The wire is forced to oscillate using an alternating electrical current flowing perpendicular to the magnetic field direction. The motion of the wire is deduced by measuring the magnitude and phase shift of the induced voltage across the wire with a lock-in amplifier. By changing the frequency of the driving current in the vicinity of the natural frequency of the wire, a resonance curve is extracted. The shape of the resonance curve is strongly affected by the drag force on the wire. Simultaneous heat transfer measurement is achieved by superimposing a DC component and a high frequency component to the current through the wire.
Proceedings of the 18th Australasian Fluid Mechanics Conference
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Mechanical Engineering not elsewhere classified