Simulation study on influential of ultrasonic cavitation on fouling deposition characteristic

doi:10.11949/j.issn.0438-1157.20170615

Abstract

Abstract:

In the process of ultrasonic antiscaling,the spread of ultrasonic and cavitation effect will be affected by the fluid and ultrasonic parameters,deposition character of crystallization fouling will also be changed. Thus,using the method of the FLUENT software numerical simulation compared with the experimental parameters,the effect of ultrasonic cavitation on CaSO₄ crystallization fouling removal is studied in the different fluid velocity and the ultrasonic frequencies. Results show that under the conditions of the same frequency,increasing velocity of fluid,the removal effect of ultrasonic cavitation on fouling is weakened. The removal rate caused by cavitation effect was brought into the fouling deposition process,and the effect of ultrasonic frequencies on the fouling character was obtained. With the increase of ultrasonic frequencies,fouling net deposition rate and fouling resistance increased.

Key words: ultrasonic cavitation, crystallization fouling, deposition character, numerical simulation

摘要：

在超声波防垢过程中，超声波的传播以及空化效果会受到流体及超声波参数的影响，析晶污垢的沉积特性也会随之发生变化。对此，采用FLUENT数值模拟与实验参数相比对的方法研究了不同流体速度、超声波频率下超声空化对CaSO₄析晶污垢剥蚀的影响。结果表明：同频率条件下，增大流速超声空化对污垢的剥蚀效果减弱；同流速条件下，增大超声波频率超声空化对污垢的剥蚀效果减弱。将空化效应引起的剥蚀率代入污垢的沉积过程，得到超声波频率对污垢沉积特性的影响，随着超声波频率的增加，污垢净沉积率增加、污垢热阻变大。

关键词: 超声空化, 析晶污垢, 沉积特性, 数值模拟

CLC Number:

TK124

ZHANG Aiping, FENG Zhuo, DING Quan, XU Zhiming. Simulation study on influential of ultrasonic cavitation on fouling deposition characteristic[J]. CIESC Journal, 2017, 68(S1): 184-190.

张艾萍, 冯卓, 丁权, 徐志明. 超声空化对污垢沉积特性影响的数值研究[J]. 化工学报, 2017, 68(S1): 184-190.

References 21

[1]	ALAHMAD M. Factors affecting scale formation in sea water environments an experimental approach[J]. Chemical Engineering & Technology,2008,31(1):149-156.
[2]	BENJAMIN T B,ELLIS A T. The collapse of cavitation bubbles and the pressures thereby produced against solid boundaries[J]. Philosophical Transactions of the Royal Society of London A:Mathematical,Physical and Engineering Sciences,1966,260:221-240.
[3]	PE A?G NIK B,HO A?G EVAR M,ŠIROK B,et al. Scale deposit removal by means of ultrasonic cavitation[J]. Wear,2016,356:45-52.
[4]	WALLHAUBER E,SAYED A,NOBEL S,et al. Determination of cleaning end of dairy protein fouling using an online system combining ultrasonic and classification methods[J]. Food and Bioprocess Technology,2014,7(2):506-515.
[5]	PAAKKONEN T M,OJANIEMI U,PATTIKANGAS T,et al. CFD modelling of CaCO3 crystallization fouling on heat transfer surfaces[J]. International Journal of Heat and Mass Transfer,2016,97:618-630.
[6]	MAZUE G,VIENNET R,HIHN J Y,et al. Large-scale ultrasonic cleaning system:design of multi-transducer device for boat cleaning (20 kHz)[J]. Ultrasonics Sonochemistry,2011,18(4):895-900.
[7]	QIU L,SHI L,LIU Z,et al. Effect of power ultrasound on crystallization characteristics of magnesium ammonium phosphate[J]. Ultrasonics Sonochemistry,2017,36:123.
[8]	ZHANG L,ZHOU C,WANG B,et al. Study of ultrasonic cavitation during extraction of the peanut oil at varying frequencies[J]. Ultrasonics Sonochemistry,2017,37:106-113.
[9]	KRASULYA O,BOGUSH V,TRISHINA V,et al. Impact of acoustic cavitation on food emulsions[J]. Ultrasonics Sonochemistry,2016,30:98-102.
[10]	DOOSTI M R,KARGAR R. Watertreatment using ultrasonic assistance:a review[C]//Proceedings of the International Academy of Ecology and Environmental Sciences. 2012:96-110.
[11]	YUSOF N S,BABGI B,ALGHAMDI Y,et al. Physical and chemical effects of acoustic cavitation in selected ultrasonic cleaning applications.[J]. Ultrasonics Sonochemistry,2015,29:568.
[12]	XU H,TU J,NIU F,et al. Cavitation dose in an ultrasonic cleaner and its dependence on experimental parameters[J]. Applied Acoustics,2016,(101):179-184.
[13]	BOGDAN N. Cavitation intensity of water under practical ultrasonic cleaning conditions[J]. Ultrasonics Sonochemistry,2014,(21):354-359.
[14]	张艾萍,杨钊,夏荣涛,等.强化换热管内超声空化影响因素的数值研究[J].化工机械,2016,(2):208-213. ZHANG A P,YANG Z,XIA R T,et al. Numerical simulation of ultrasonic cavitation influence factors in enhanced heart transfer tube[J]. Chemical Engineering Machinery,2016,(2):208-213.
[15]	张艾萍,杨洋. 超声波防垢和除垢技术的应用及其空化效应机理[J]. 黑龙江电力,2010,32(5):321-324. ZHANG A P,YANG Y. Application of ultrasonic antiscaling and descaling and its cavitation effect mechanism[J]. Heilongjiang Electric Power,2010,32(5):321-324.
[16]	陶文铨. 数值传热学[M]. 西安:西安交通大学出版社,2001:19-25. TAO W Q. Numerical Heat Transfer[M]. Xi'an:Xi'an Jiaotong University Press,2001:19-25.
[17]	徐志明,张一龙,徐欣. 温度及浓度对析晶污垢沉积特性影响的模拟研究[J]. 中国电机工程学报,2014,34(35):6263-6270. XU Z M,ZHANG Y L,XU X. Simulation study on influential of temperature and concentration on crystallization fouling deposition[J]. Proceedings of the CSEE,2014,34(35):6263-6270.
[18]	BRAHIM F,AUGUSTIN W,BOHNET M. Numerical simulation of the fouling process[J]. International Journal of Thermal Sciences,2003,42(3):323-334.
[19]	KRAUSE S. Fouling of heat-transfer surfaces by cryst-allization and sedimentation[J]. International Chemical Engineering (A Quarterly Journal of Translations from Russia,Eastern Europe and Asia)(United States),1993,33(3):355-401.
[20]	杨善让,徐志明,孙灵芳. 换热设备污垢与对策[M]. 北京:科学出版社,2004:1-20. YANG S R,XU Z M,SUN L F. Fouling and Countermeasures for Heat Transfer Equipment[M]. Beijing:Scientific Press,2004:1-20.
[21]	孙晓清,符卫春,张明铎.直管中流体流速对超声波防垢效果的影响[J].声学技术,2010,(6):600-602. SUN X Q,FU W C,ZHANG M D. Experimental study of flow rate effect on ultrasonic anti-scaling control[J].Technical Acoustic,2010,(6):600-602.