This paper presents a mechanical-to-electrical energy conversion concept by using the upward movement of air bubbles in ferrofluids. As ferrofluids are magnetized by a magnetic field, the air bubbles passing through the induction coils will change magnetic flux in the coils and produce electromotive force. Therefore, the kinetic energy of air bubbles converts into electricity. The idea possesses a promising prospect to be applied in the non-contact sensor field, which can monitor the flow states of boiling two-phase flow in a heat exchanger and warn the deterioration of heat transfer. A millivolt-level induced voltage with a waveform like a sine wave can be generated. The induced voltage's peak value is approximately proportional to the air bubble's volume and velocity and tends to saturate as the magnetic field strength increases.

本文通过利用铁磁流体中的气泡向上运动，提出了一种机械到电能转换的概念。当铁磁流体被磁场磁化时，穿过感应线圈的气泡将改变线圈中的磁通量并产生电动势。因此，气泡的动能转化为电能。该思想在非接触式传感器领域具有广阔的应用前景，可以监测热交换器中沸腾两相流的流动状态，并警告传热的恶化。可以产生具有正弦波等波形的毫伏级感应电压。感应电压的峰值大约与气泡的体积和速度成正比，并随着磁场强度的增加而趋于饱和。