文丘里管水力空化反应器空化流场特性分析
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摘要
在综合考虑入口压力、不同喉部直径、不同入口加氧量、液体可压缩性以及湍流作用等情况下,以文丘里管喉部压力小于等于相应温度下的饱和蒸汽压为依据,设计了空化装置。基于连续性方程、伯努利方程、空化泡动力学方程求解了空泡径向非线性方程。采用计算流体软件FLUENT以文丘里管不同入口压力、喉部直径和入口加氧量等为变量进行了单因素数值模拟试验,获得了文丘里管反应器内空泡的成长与溃灭特性,分析了湍流作用下入口压力及不同喉部直径对空化泡运动特性及其所形成压力脉冲的影响规律。搭建水力空化装置试验台对污水进行处理测试,试验处理结果表明:对石油污水处理后COD(chemical oxygen demand,化学需氧量)降低41.14%,对造纸厂污水处理后COD降低63.83%,说明空化反应器合适的结构参数和控制参数有利于提高空化强度。
Under the comprehensive consideration of inlet pressure,different throat diameter,different inlet oxygen content,liquid compressibility and turbulence,on the basis of the pressure of the Venturi tube throat pressure less than equal to the saturated vapor pressure at the corresponding temperature,the cavitation device for Venturi tube was designed.The nonlinear equation of the cavitation is solved on the basis of the continuity equation,Bernoulli equation and cavitation bubble dynamics equation.Single factor numerical simulation was carried on with the inlet pressure,throat diameter and inlet oxygen content as variable by means of the computational fluid software FLUENT.The property of growth and collapse of bubbles in Venturi tube cavitation reactor was obtained.The influence of the inlet pressure and the throat diameter on the motion characteristics of the cavitation bubble and the pres-sure pulse formed under the action of turbulence was analyzed.Finally,a set of hydraulic cavitation test device was established.Experimental results show that after processing COD(chemical oxygen demand,COD)of oil sewage decreases by 41.14%,COD of paper sewage decreases by 63.83%.the appropriate structural parameters and control parameters of the cavitation reactor are conducive to the enhancement of the cavitation intensity.
Under the comprehensive consideration of inlet pressure,different throat diameter,different inlet oxygen content,liquid compressibility and turbulence,on the basis of the pressure of the Venturi tube throat pressure less than equal to the saturated vapor pressure at the corresponding temperature,the cavitation device for Venturi tube was designed.The nonlinear equation of the cavitation is solved on the basis of the continuity equation,Bernoulli equation and cavitation bubble dynamics equation.Single factor numerical simulation was carried on with the inlet pressure,throat diameter and inlet oxygen content as variable by means of the computational fluid software FLUENT.The property of growth and collapse of bubbles in Venturi tube cavitation reactor was obtained.The influence of the inlet pressure and the throat diameter on the motion characteristics of the cavitation bubble and the pres-sure pulse formed under the action of turbulence was analyzed.Finally,a set of hydraulic cavitation test device was established.Experimental results show that after processing COD(chemical oxygen demand,COD)of oil sewage decreases by 41.14%,COD of paper sewage decreases by 63.83%.the appropriate structural parameters and control parameters of the cavitation reactor are conducive to the enhancement of the cavitation intensity.
引文
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[16]武志林,王伟民,李维新,等.水力空化联合臭氧氧化灭藻技术的实际应用[J].生态与农村环境学报,2016(3):500-506.WU Zhilin,WANG Weimin,LI Weixin,et al.Hydrodynamic cavitation combined with ozone oxidation algaecide technology application[J].Journal of Ecology and Rural Environment,2016(3):500-506.
[17]王常斌,王敏,于远洋,等.文丘里管水力空化现象的CFD模拟[J].管道技术与设备,2013(1):10-12.WANG Changbin,WANG Min,YU Yuanyang,et al.CFD simulation of hydraulic cavitation in Venturi tube[J].Pipeline Technology and Equipment,2013(1):10-12.
[2]PANDIT A B,GOGATE P R.A review and assessment of hydrodynamic cavitation as a technology for the future[J].Ultrasonics Sonochemistry,2001(12):21-27.
[3]GOGATE P R.Cavitation:An auxiliary technique in wastewater treatment schemes[J].Advances in Environmental Research,2002(6):335-358.
[4]SIVAKUMAR M,PANDIT A B.Water treatment:A novel energy efficient hydrodynamic cavitational technique[J].Ultrasonics Sonochemistry,2002(9):123-131.
[5]JYOTI K K,PANDIT A B.Water disinfection acoustic and hydrodynamic cavitation[J].Biochemical Engineering Journal,2001(7):201-212.
[6]姚锐豪,董志勇,张凯.多孔板水力空化对降解化工废水的影响[J].环境污染与防治,2015,37(9):5-8.YAO Ruihao,DONG Zhiyong,ZHANG Kai.Effect of hydraulic cavitation on the degradation of chemical wastewater by porous plates[J].Environmental Pollution and Prevention and Control,2015,37(9):5-8.
[7]李志义.水力空化及其对化工过程的强化作用[J].化学工程,2004,32(4):27-29.LI Zhiyi.Hydraulic cavitation and its strengthening effect on chemical process[J].Chemical Engineering,2004,32(4):27-29.
[8]冯中营.空化及其在杀菌中的应用[J].科学技术与工程,2010,10(5):1208-1210.FENG Zhongying.Cavitation and its application on sterilization[J].Science Technology and Engineering,2010,10(5):1208-1210.
[9]管金发,邓松圣,张攀峰,等.文丘里管空化装置设计与数值模拟[J].后勤工程学院学报,2012(5):30-34.GUAN Jinfa,DENG Songsheng,ZHANG Panfeng,et al.Venturi tube cavitation device design and numerical simulation[J].Journal of Logistics Engineering,2012(5):30-34.
[10]高秋生.对液体空化机理的进一步探究[J].河海大学学报(自然科学版),1999,27(5):63-67.GAO Qiusheng.Further exploration of the mechanism of liquid cavitation[J].Journal of Hohai University(Natural Science Edition),1999,27(5):63-67.
[11]季斌,白晓蕊,祝叶,等.水力机械空化水动力学的几个基础问题研究[J].水动力学研究与进展(A辑),2017(5):542-550.JI Bin,BAI Xiaorui,ZHU Ye,et al.Research on several basic problems of hydraulic mechanical cavitation hydrodynamics[J].Hydrodynamics Research and Progress(Series A),2017(5):542-550.
[12]王智勇,张晓东,杨会中.文丘里管中空化流场的数值模拟[J].计算机与应用化学,2006(10):1001-4160.WANG Zhiyong,ZHANG Xiaodong,YANG Huizhong.Numerical simulation of cavitation flow in Venturi tube[J].Computer and Applied Chemistry,2006(10):1001-4160.
[13]何志霞,张鑫,陈驭航,等.单孔孔板水力空化特性的可视化与数值模拟[J].江苏大学学报,2017(4):416-422.HE Zhixia,ZHANG Xin,CHEN Yuhang,et al.Visualization and numerical simulation of hydraulic cavitation characteristics of a single hole plate[J].Journal of Jiangsu University,2017(4):416-422.
[14]邓洁,许仕荣,张伟.水力空化强化效应的实验研究[J].兰州理工大学学报,2008(5):72-76.DENG Jie,XU Shirong,ZHANG Wei.Experimental research on the enhancement effect of hydraulic cavitation[J].Journal of Lanzhou University of Technology,2008(5):72-76.
[15]陈驭航,何志霞,纪长浩.水力空化耦合撞击流空化器的数值模拟[J].液压气动与密封,2015(17):33-35.CHEN Yuhang,HE Zhixia,JI Changhao.Numerical simulation of hydraulic cavitation coupled impinging flow cavitation[J].Hydraulic Pneumatic and Seal,2015(17):33-35.
[16]武志林,王伟民,李维新,等.水力空化联合臭氧氧化灭藻技术的实际应用[J].生态与农村环境学报,2016(3):500-506.WU Zhilin,WANG Weimin,LI Weixin,et al.Hydrodynamic cavitation combined with ozone oxidation algaecide technology application[J].Journal of Ecology and Rural Environment,2016(3):500-506.
[17]王常斌,王敏,于远洋,等.文丘里管水力空化现象的CFD模拟[J].管道技术与设备,2013(1):10-12.WANG Changbin,WANG Min,YU Yuanyang,et al.CFD simulation of hydraulic cavitation in Venturi tube[J].Pipeline Technology and Equipment,2013(1):10-12.