抄録
The effect of liquid temperature on cavitation erosion has been studied by several researchers. The general trend is that the erosion rate shows a maximum at approximate average of boiling and freezing temperatures in some liquids. However, the erosion mechanisms of these phenomena have not been clarified. In this study, cavitation erosion tests were carried out by using a SUS304 stainless steel in deionized water at different liquid temperatures and pressures. We summarized the test results by using the Celsius temperature and the relative temperature as a temperature parameter, and discussed the effect of temperature on the mass loss rate. In addition, cavitation bubble behavior depending on the thermodynamic effect was observed by high speed camera. Moreover, the cause of the temperature effect of cavitation erosion is discussed in terms of viscosity, air content, surface tension and distribution of bubble collapse impact loads. As a result, the mass loss rate of SUS304 indicates a maximum at a relative temperature TR of 40-50 ° and the rate decreases with increasing or decreasing the relative temperature in deionized water. These tendencies are similar to that in other researches. Therefore, the relative temperature is suitable for the evaluation of temperature dependency under different pressures. In addition, we explained that the cause of the decreased mass loss rate is to strengthen the thermodynamic effect in high temperature region and to change in the distribution of bubble collapse impact loads in low temperature region.
