水力空化效应对水物化性质影响的实验研究

Experimental Study on the Effect of Hydraulic Cavitation on the Physical and Chemical Properties of Water

水力空化过程伴随着气泡的初生、生长、溃灭以及气泡溃灭产生的瞬间高温高压,这种空化效应对于空化介质本身产生怎样的影响一直缺乏研究。以单孔、五孔孔板型空化器为实验装置,研究水力空化效应对水物化性质的影响。首先,在相同空化时间和测量温度下,调节空化器不同入口压力(0.3 MPa、0.5 MPa、0.7 MPa、1 MPa),对孔板空化器内的空化水样进行电导率、溶解氧、pH的测试,分别得到水样三种性质随入口压力和时间变化曲线。实验结果表明,随着入口压力的增大,电导率先逐渐升高后逐渐降低:溶解氧先逐渐降低后逐渐回升;pH受水力空化效应影响较小,整体上没有明显的变化规律。

The hydrodynamic cavitation process is accompanied by the initiation,growth,collapse and instantaneous high temperature and high pressure of the bubble collapse.The effect of this cavitation effect on the cavitation medium itself has been lacking in research.In this paper,single-hole and five-hole plate-type cavities are used as experimental devices to study the influence of hydraulic cavitation effects on the physicochemical properties of water.First,under the same cavitation time and measurement temperature,We adjust the different inlet pressures of the cavitation device(0.3 MPa,0.5 MPa,0.7 MPa,1 MPa),and conduct conductivity and dissolution of the cavitation water sample in the orifice cavitation device,oxygen,pH test,the three properties of the water sample with the inlet pressure and time curve.The experimental results show that as the inlet pressure increases,the conductivity first gradually increases and then gradually decreases:dissolved oxygen first gradually decreases and then gradually rises;pH is less affected by the effect of hydraulic cavitation,and there is no obvious change rule overall.