Gao Jinbiao, Shen Xiaozhuo, Mo Xiaohai, Wu Pengfei, Li Chao, Lin Weijun, Wang Xiuming
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Sea Deep Drilling and Exploration, Beijing 100190, China.
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Sea Deep Drilling and Exploration, Beijing 100190, China.
Ultrason Sonochem. 2023 Aug;98:106460. doi: 10.1016/j.ultsonch.2023.106460. Epub 2023 May 27.
It is rather significant to reveal the real-time variation of oil sample viscosity during ultrasonic irradiation to research the mechanism of viscosity change. In this paper, we first simulate the acoustic field distribution law in the reaction chamber by using the finite element method and orthogonal experiment method, then measure the viscosity of the oil sample with temperature by vibration type viscometer and get the corresponding function equation by fitting. On this basis, we measure the viscosity of the oil sample with ultrasonic irradiation time and electric power change in real-time and in situ, and finally analyze the mechanism of oil sample viscosity variation by using a temperature recorder and cavitation noise method. The results show that the greatest influence on the acoustic pressure in the reaction chamber is the change of the transducer probe in the height Z direction, followed by the width X direction and the depth Y direction. The viscosity of the oil sample shows an exponential decay with the increase in temperature. With the increase of ultrasonic irradiation time and electric power, the viscosity of the oil sample is gradually reduced. By comparing the effect of heating and ultrasonic irradiation on viscosity, it is found that ultrasonic irradiation not only changes the viscosity through thermal effect but also the cavitation noise analysis and the phenomena observed in the experiment confirm that the cavitation effect and mechanical effect exist all the time.
揭示超声辐照过程中油样粘度的实时变化对于研究粘度变化机制具有重要意义。本文首先采用有限元法和正交试验法模拟反应腔内的声场分布规律，然后用振动式粘度计测量油样粘度随温度的变化，并通过拟合得到相应的函数方程。在此基础上，实时原位测量油样粘度随超声辐照时间和电功率的变化，最后利用温度记录仪和空化噪声法分析油样粘度变化的机制。结果表明，对反应腔内声压影响最大的是换能器探头在高度Z方向的变化，其次是宽度X方向和深度Y方向。油样粘度随温度升高呈指数衰减。随着超声辐照时间和电功率的增加，油样粘度逐渐降低。通过比较加热和超声辐照对粘度的影响发现，超声辐照不仅通过热效应改变粘度，而且空化噪声分析和实验中观察到的现象证实空化效应和机械效应一直存在。
