摘要：Hydrodynamic cavitation (HC) commonly occurs within industrial pipelines and its unsteady flow characteristics are of great significance for energy conservation and efficiency improvement. This study investigates the effects of methanol concentration (0-20 wt%) on the cavitating flow characteristics and the degradation of Rhodamine B (RhB) under operating conditions of a 0.7 MPa pressure drop, temperature of 30 degrees C, 200 passes through a venturi reactor, and an initial RhB concentration of 40 mu mol/L. The transient cavitation behavior was monitored using a high-speed camera. The cavitation images show that the presence of methanol generates more stable bubbles, which results in less violent bubble collapse. The pressure pulsation and vibration induced by cavitation flow were synchronously measured using high-frequency pressure and acceleration sensors. The spectral analyses of the pressure pulsation indicate that methanol has no effect on the dominant frequency (~5.5 Hz) at different positions, and the amplitude initially increases with increasing methanol concentration and then stabilizes. The pressure pulsation intensity increases due to the increased vapor pressure of the solution. The vibration spectral analyses show that methanol has little effect on the peak frequencies, which occur near 4.0 kHz and 14.3 kHz of the low and high-frequency bands, respectively, whereas the peak amplitude decreases with increasing methanol concentration. The per-pass degradation model of RhB in methanol solution considering pyrolysis of methanol was verified for the first time and show to adequately describe the experimental data. The degradation percentage and per-pass degradation factor decrease with increasing methanol concentration. The reduced surface tension of the solution prolongs the bubble lifespan and prevents bubble coalescence, thus weakening the vibration and degradation performance. The results provide important insight for cavitation applications and degradation modeling of mixed solutions.

关键字：Hydrodynamic cavitation; Venturi reactor; Bubble dynamics; Pressure pulsation; Vibration; Degradation

ISSN号：0955-5986

卷、期、页：卷: 85

发表日期：2022-06-01

影响因子：2.036800

期刊分区（SCI为中科院分区）：四区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）

发表期刊名称：FLOW MEASUREMENT AND INSTRUMENTATION

通讯作者：张家辉,罗景泉,董波,王琳

第一作者：王逸伟,徐振,刘爱贤,郭绪强

论文类型：期刊论文

论文概要：张家辉,罗景泉,王逸伟,董波,徐振,王琳,刘爱贤,郭绪强，Experimental investigation on characteristics of venturi cavitating flow and Rhodamine B degradation in methanol solution，FLOW MEASUREMENT AND INSTRUMENTATION，2022，卷: 85

论文题目：Experimental investigation on characteristics of venturi cavitating flow and Rhodamine B degradation in methanol solution