Zhang Xiangyu, Zhu Xinfeng, Cao Yan, Zhang Kunming, Huang Yongchun, Yang Feng, Ren Xian'e
Guangxi Key Laboratory of Green Processing of Sugar Resources, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, P. R. China.
School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, P. R. China.
ACS Omega. 2021 Jan 28;6(5):3736-3744. doi: 10.1021/acsomega.0c05335. eCollection 2021 Feb 9.
In this paper, the hydroxyl radical yield of a cavitation bubble and its influencing factors in the process of chitosan degradation with hydrodynamic cavitation in a single-hole orifice plate was investigated by a numerical simulation method. The hydroxyl radical yield of the cavitation bubble was calculated and analyzed by the Gilmore equation as the dynamic equation combined with the mass transfer equation, heat transfer equation, energy balance equation, and the principle of Gibbs free energy minimization. The influence of geometric parameters of the orifice plate and operating parameters on the formation of hydroxyl radicals was investigated. The results showed that the hydroxyl radicals produced at the moment of cavitation bubble collapse increased with the increase of the initial radius ( ), upstream inlet pressure ( ), downstream recovery pressure ( ), downstream pipe diameter ( ), and the ratio of the orifice diameter to the pipe diameter (β). The simulation results provide a certain basis for the regulation of hydrodynamic cavitation degradation of chitosan.
本文采用数值模拟方法，研究了在单孔孔板中利用水力空化降解壳聚糖过程中，空化泡的羟基自由基产率及其影响因素。以吉尔摩方程作为动力学方程，结合传质方程、传热方程、能量平衡方程以及吉布斯自由能最小原理，计算并分析了空化泡的羟基自由基产率。研究了孔板几何参数和操作参数对羟基自由基形成的影响。结果表明，空化泡崩溃瞬间产生的羟基自由基随初始半径（）、上游入口压力（）、下游恢复压力（）、下游管道直径（）以及孔板直径与管道直径之比（β）的增加而增加。模拟结果为壳聚糖水力空化降解的调控提供了一定依据。
