杜强,陈律名,曾宏伟,陈冰冰

• 1:浙江工业大学 机械工程学院， 浙江 杭州 310023

摘要(Abstract)：

为了进一步提高受限撞击流反应器内纳米颗粒结晶性能,在反应器中引入超声场来强化反应器内入射流撞击区域上方“三角区域”流动与微观混合过程。采用Villermaux-Dushman平行竞争反应体系对超声强化的受限撞击流反应器内微观混合过程进行实验研究,使用离集指数、微观混合时间以及达姆科勒数对反应器内微观混合性能进行表征。结果表明:低频超声场通过诱导超声空化效应能有效地强化撞击流反应器内微观混合过程,低雷诺数时效果更为明显。与未施加超声相比,在超声作用下离集指数减小10.9%~23.5%,微观混合时间从0.000 16~0.000 43 s缩短至0.000 14~0.000 33 s。研究发现该反应器在所有工况下达姆科勒数均小于1,表明该化学反应由微观混合过程主导。

关键词(KeyWords)： 撞击流;超声强化;微观混合;离集指数

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(21908195)

作者(Author): 杜强,陈律名,曾宏伟,陈冰冰

DOI: 10.3969/j.issn.1003-9015.2023.05.006

参考文献(References)：

• [1] GUO T Y, RUAN B, LIU Z W, et al. Numerical and experimental investigations of liquid mixing in two-stage micro-impinging stream reactors[J]. Chinese Journal of Chemical Engineering, 2017, 25(4):391-400.
  [2] YANG P F, LUO S, ZHANG D S, et al. Extraction of nitrobenzene from aqueous solution in impinging stream rotating packed bed[J]. Chemical Engineering and Processing, 2018, 124(2):255-260.
  [3] 程海涛,申献双.超声-射流-撞击空化提取柚子皮原花青素[J].食品工业, 2020, 41(8):118-122.CHENG H T, SHEN X S. Ultrasonic-jet-impact cavitation extraction of proanthocyanidins from grapefruit peel[J]. The Food Industry, 2020, 41(8):118-122.
  [4] 邓冬梅,李晴,黄永春,等.文丘里管结构对焦化废水降解的影响[J].工业水处理, 2018, 38(2):26-30.DENG D M, LI Q, HUANG Y C, et al. Influences of venturi tube structures on coking wastewater degradation by impinging stream-hydrodynamic cavitation[J]. Industrial Water Treatment, 2018, 38(2):26-30.
  [5] VATTA L L, SANDERSON R D, KOCK K R. An investigation into the potential large-scale continuous magnetite nanoparticle synthesis by high-pressure impinging stream reactors[J]. Journal of Magnetism and Magnetic Materials, 2007, 311(1):114-119.
  [6] 陈建樑,张林锋,伍堃,等.撞击流结晶器和传统结晶器中乙酰水杨酸结晶的研究[J].山东化工, 2020, 49(5):76-77, 127.CHEN J L, ZHANG L F, WU K, et al. Study on crystallization of acetyl salicylic acid in impinging crystallizer and traditional crystallizer[J]. Shandong Chemical Industry, 2020, 49(5):76-77.
  [7] LIU Z W, GUO L, HUANG T H, et al. Experimental and CFD studies on the intensified micromixingperformance of micro-impinging stream reactors built fromcommercial T-junctions[J]. Chemical Engineering Science, 2014, 119(11):124-133.
  [8] 李友凤,叶红齐,何显达,等.撞击流混合器微观混合性能的研究[J].高校化学工程学报, 2012, 26(1):49-55.LI Y F, YE H Q, HE X D, et al. Study on micromixingcharacteristics of impinging streams mixers[J]. Journal of Chemical Engineering of Chinese Universities, 2012, 26(1):49-55.
  [9] CHEN L M, DONG B, GUO Y Q, et al. CFD modelling of the effects of local turbulence intensification on synthesis of LiFePO₄ particles in an impinging jet reactor[J]. Chemical Engineering&Processing:Process Intensification, 2020, 155(9):108065.
  [10] MONNIER H, WILHELM A M, DELMAS H. Influence of ultrasound on mixing on the molecular scale for water and viscous liquids[J]. Ultrasonics Sonochemistry, 1999, 6(1):67-74.
  [11] JORDENS J, BAMPS B, GIELEN B, et al. The effects of ultrasound on micromixing[J]. Ultrasonics Sonochemistry, 2016, 32(9):68-78.
  [12] GUO Z, JONES A G, LI N. The effect of ultrasound on the homogeneous nucleation of BaSO₄ during reactive crystallization[J].Chemical Engineering Science, 2006, 61(5):1617-1626.
  [13] PARVIZIAN F, RAHIMI M, FARYADI M. Macro-and micromixing in a novel sonochemical reactor using high frequency ultrasound[J]. Chemical Engineering and Processing:Process Intensification, 2011, 50(8):732-740.
  [14] PARVIZIAN F, RAHIMI M, AZIMI N. Macro-and micromixing studies on a high frequency continuous tubular sonoreactor[J].Chemical Engineering and Processing Process Intensification, 2012, 57/58:8-15.
  [15] PÉREZ A, CENTENO M A, ODRIOZOLA J A, et al. The effect of ultrasound in the synthesis of clays used as catalysts in oxidation reactions[J]. Catalysis Today, 2008, 133:526-529.
  [16] JAGANNATHAN T K, NAGARAJAN R, RAMAMURTHI K. Effect of ultrasound on bubble breakup within the mixing chamber of an effervescent atomizer[J]. Chemical Engineering and Processing:Process Intensification, 2011, 50(3):305-315.
  [17] D’ANNA F, MARULLO S,VITALE P, et al. Synthesis of aryl azides:A probe reaction to study the synergetic action of ultrasounds and ionic liquids[J]. Ultrasonics Sonochemistry, 2012, 19(1):136-142.
  [18] 董正亚,陈光文,赵帅南,等.声化学微反应器—超声和微反应器协同强化[J].化工学报, 2018, 69(1):102-115.DONG Z Y, CHEN G W, ZHAO S N, et al. Sonochemical microreactor-synergisticintensificationofultrasoundandmicroreactor[J].CIESC Journal, 2018. 69(1):102-115.
  [19] VICHARE N P, GOGATE P R, DINDORE V Y, et al. Mixing time analysis of a sonochemical reactor[J]. Ultrasonics Sonochemistry, 2001, 8(1):23-33.
  [20] RAHIMI M, AGHEL B, HATAMIFAR B, et al. CFD modeling of mixing intensification assisted with ultrasound wave in a T-type microreactor[J]. Chemical Engineering and Processing:Process Intensification, 2014, 86(12):36-46.
  [21] FARYADI M, RAHIMI M, SAFARI S, et al. Effect of high frequency ultrasound on micromixing efficiency in microchannels[J].Chemical Engineering and Processing Process Intensification, 2014, 77(3):13-21.
  [22] DONG Z Y, ZHAO S N, ZHANG Y C, et al. Mixing and residence time distribution in ultrasonic microreactors[J]. AIChE Journal,2017, 63(4):1404-1418.
  [23] CHEN L M, ZENG H W, GUO Y Q, et al. A comparative analysis of micro-mixing process in a confined impinging jet reactor with/without applying ultrasound[J]. Chemical Engineering and Processing:Process Intensification, 2022, 177(7):108991.
  [24] GUO Y Q, YANG X G, LI G, et al. Effect of ultrasonic intensification on synthesis of nano-sized particles with an impinging jet reactor[J]. Powder Technology, 2019, 354(9):218-230.
  [25] GAO Z M, HAN J, BAO Y Y, et al. Micromixing efficiency in a T-shaped confined impinging jet reactor[J]. Chinese Journal of Chemical Engineering, 2015, 23(2):350-355.
  [26] 刘一鸣.高速撞击流反应器的微观混合特性的实验研究[D].北京:北京化工大学, 2015.LIU Y M. Experimental investigation of micromixing efficiency in confined impinging jets reactor[D]. Beijing:Beijing University of Chemical Technology, 2015.
  [27] MONNIERH, WILHELM A M, DELMAS H. Effects of ultrasound on micromixing in flow cell[J]. Chemical Engineering Science,2000, 55(19):4009-4020.
  [28] YANG H J, CHU G W, ZHANG J W, et al. Micromixing efficiency in a rotating packed bed:Experiments and simulation[J].Industrial&Engineering Chemistry Research, 2005, 44(20):7730-7737.