Abstract
Cleavage of hydrocarbon in the initial stage of oil degradation is caused by heat and mechanical shearing. However, recently it has been suggested that electrostatic discharge has a possibility of cleavage of hydrocarbon. Most of machinery has a filtering system in order to filter contaminations in oil. It is found that electrostatic discharge occurs during oil filtration and then the oil is degraded. However, this mechanism has not been elucidated. Therefore, the purpose of this study is to quantify static electricity during oil filtration and elucidate its mechanism. We used test equipment assumed filtering system of machinery, and measured electrostatic voltage of middle of filter holder while changing the parameters of pump flow rate, oil temperature and oil conductivity. As a result, it was found that static electricity during oil filtration increased with increasing of flow rate, and decreasing of oil temperature and oil conductivity. Then we discussed the relationship between static electricity and flow rate of exit.
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