雷丽¹,李慧玲¹,赵玉婷¹,周乃香²,张井志^1,3

• 1:山东大学 能源与动力工程学院，山东 济南 250061
• 2:山东省城乡规划设计研究院，山东 济南 250013
• 3:山东大学 动力工程及工程热物理博士后科研流动站，山东 济南 250061

摘要(Abstract)：

为了研究凹穴型结构对微通道内液-液两相流动特性的影响，利用高速摄像机，结合边缘检测算法（Canny），获得两相流型、液滴长度和膨胀面积等参数。结果表明：基于无量纲液滴长度参数，凹穴微通道内流型主要为膨胀流、过渡流及滴状流。随两相体积流量的增大，液滴长度逐渐减小，流型由膨胀流逐渐转换为过渡流，当液滴长度小于通道宽度时，凹穴结构对液滴形状的影响可以忽略。凹穴型通道内的液滴长度呈周期性变化，长度变化振幅为平直段的3~5.6倍。无量纲液滴膨胀面积随离散相与连续相流量之比的增大逐渐增大，随连续相毛细管数增大而逐渐降低。

关键词(KeyWords)： 微通道;两相流;凹穴型通道;液滴;流型

Abstract:

Keywords:

基金项目(Foundation): 山东省重点研发计划（2019GSF109051）；中国博士后科学基金（2018M642655）；山东省自然科学基金（ZR2018BEE026）。

作者(Author): 雷丽¹,李慧玲¹,赵玉婷¹,周乃香²,张井志^1,3

DOI: 10.3969/j.issn.1003-9015.2020.06.004

参考文献(References)：

• [1] 魏丽娟, 付涛涛, 朱春英, 等. 微通道内液液两相流压力降的测量和关联[J]. 高校化学工程学报, 2013, 27(4):555-560. WEI L J, FU T T, ZHU C Y, et al. Measurement and correlation of pressure drop of liquid-liquid two-phase flow in microchannels[J]. Journal of Chemical Engineering of Chinese Universities, 2013, 27(4):555-560.
  [2] ZHAO Y, SU Y, CHEN G, et al. Effect of surface properties on the flow characteristics and mass transfer performance in microchannels[J]. Chemical Engineering Science, 2010, 65(5):1563-1570.
  [3] DANG M, YUE J, CHEN G, et al. Formation characteristics of Taylor bubbles in a microchannel with a converging shape mixing junction[J]. Chemical Engineering Journal, 2013, 223(14):99-109.
  [4] YAO C Q, ZHENG J, ZHAO Y, et al. Characteristics of gas-liquid Taylor flow with different liquid viscosities in a rectangular microchannel[J]. Chemical Engineering Journal, 2019, 373(10):437-445.
  [5] CHEN Z, XU J, WANG Y. Gas-liquid-liquid multiphase flow in microfluidic systems[J]. Chemical Engineering Science, 2019, 202(13):1-14.
  [6] 付涛涛, 惠晓荣, 朱春英, 等. 十字型微通道内气泡形成的实验观察[J]. 高校化学工程学报, 2011, 25(2):337-340. FU T T, HUI X R, ZHU C Y, et al. Formation of dispersed small bubbles in flow-focusing microchannels[J]. Journal of Chemical Engineering of Chinese Universities,2011, 25(2):337-340.
  [7] YIN Y, ZHU C, GUO R, et al. Gas-liquid two-phase flow in a square microchannel with chemical mass transfer:Flow pattern, void fraction and frictional pressure drop[J]. International Journal of Heat and Mass Transfer, 2018, 127(30):484-496.
  [8] YAO C, LIU Y, XU C, et al. Formation of liquid-liquid slug flow in a microfluidic T-junction:Effects of fluid properties and leakage flow[J]. AIChE Journal, 2018, 64(1):346-357.
  [9] 张吉松, 刘国涛, 王凯,等. 微通道内传递对液液分散过程的影响规律[J]. 化工学报, 2015, 66(8):2940-2946. ZHANG J S, LIU G T, WANG K, et al. Effect of transfer on liquid-liquid dispersion in microchannels[J]. CIESC Journal, 2015, 66(8):2940-2946.
  [10] 王晓军, 张林, 吴苏晨, 等. T型微通道内液-液两相流流型研究[J]. 高校化学工程学报, 2017, 31(1):13-20. WANG X J, ZHANG L, WU S C, et al. Study on liquid-liquid two-phase flow patterns in a T-shaped microchannel[J]. Journal of Chemical Engineering of Chinese Universities, 2017, 31(1):13-20.
  [11] WU Z, CAO Z, SUNDEN B. Liquid-liquid flow patterns and slug hydrodynamics in square microchannels of cross-shaped junctions[J]. Chemical Engineering Science, 2017, 174(1):56-66.
  [12] 温宇, 朱春英, 付涛涛,等. 不等宽T型分岔微通道内气泡的体积分配规律及关联[J]. 高校化学工程学报, 2016, 30(1):19-25. WEN Y, ZHU C Y, FU T T, et al. Volume distribution and correlation of bubbles in a microfluidic T-junction with unequal width bifurcations[J]. Journal of Chemical Engineering of Chinese Universities, 2016, 30(1):19-25.
  [13] ZHU P, WANG L. Passive and active droplet generation with microfluidics:A review[J]. Lab on a Chip, 2017, 17(1):34-75.
  [14] DE MENECH M, GARSTECKI P, JOUSSE F, et al. Transition from squeezing to dripping in a microfluidic T-shaped junction[J]. Journal of Fluid Mechanics, 2008, 595(1):141-161.
  [15] 韩雪兵, 杨帆, 郭雪岩. 二维T型微通道内液滴生成的数值模拟[J]. 能源工程, 2018(1):14-19+24. HAN X B, YANG F, GUO X Y. Numerical simulation of droplet formation in two-dimensional T-junction microchannel[J]. Energy Engineering, 2018(1):14-19+24.
  [16] YIN Y, ZHU C, FU T, et al. Enhancement effect and mechanism of gas-liquid mass transfer by baffles embedded in the microchannel[J]. Chemical Engineering Science, 2019, 201(6):264-273.
  [17] PARK J S, JUNG H I. Multiorifice flow fractionation:continuous size-based separation of microspheres using a series of contraction/expansion microchannels[J]. Analytical Chemistry, 2009, 81(20):8280-8288.
  [18] SIM T S, KWON K, PARK J C, et al. Multistage-multiorifice flow fractionation (MS-MOFF):continuous size-based separation of microspheres using multiple series of contraction/expansion microchannels[J]. Lab on a Chip, 2011, 11(1):93-99.
  [19] BHAGAT A S, HOU H W, LI L D, et al. Pinched flow coupled shear-modulated inertial microfluidics for high-throughput rare blood cell separation[J]. Lab on a Chip, 2011, 11(11):1870-1878.
  [20] 夏国栋, 翟玉玲, 崔珍珍, 等. 带有内肋的凹穴型微通道热沉的熵产及传热特性分析[J]. 中国科学:技术科学, 2013, 43(8):860-866. XIA G D, ZHAI Y L, CUI Z Z, et al. Characteristics of entropy generation and heat transfer in a microchannel with fan-shaped reentrant cavities and internal ribs[J]. Science China:Technological Science, 2013, 43(8):860-866.
  [21] 柴磊, 夏国栋, 周明正, 等. 扇形凹穴型微通道液体流动与传热特性的数值模拟[J]. 哈尔滨工业大学学报, 2011, 43(6):122-126. CHAI L, XIA G D, ZHOU M Z, et al. Numerical simulation of fluid flow and heat transfer in a microchannel with fan-shaped reentrant cavities[J]. Journal of Harbin Institute of Technology, 2011, 43(6):122-126.
  [22] 翟玉玲, 夏国栋, 杜墨. 入口流动方式对双层微通道热沉传热性能的影响[J]. 中国科技论文, 2015, 10(17):2050-2053, 2058. ZHAI Y L, XIA G D, DU M. Heat transfer performance of enhanced heat transfer process in microchannel heat sink[J]. China Sciencepaper, 2015, 10(17):2050-2053, 2058.
  [23] GARSTECKI P, FUERSTMAN M J, STONE H A, et al. Formation of droplets and bubbles in a microfluidic T-junction scaling and mechanism of break-up[J]. Lab on a Chip, 2006, 6(3):437-446.
  [24] 钱锦远, 李晓娟, 吴赞, 等. 微通道内液-液两相流流型及传质的研究进展[J]. 化工进展, 2019, 38(4):1624-1633. QIAN J Y, LI X J, WU Z, et al. Research progress on flow regimes and mass transfer of liquid-liquid two-phase flow in microchannels[J]. Chemical Industry and Engineering Progress, 2019, 38(4):1624-1633.
  [25] GLAWDEL T, ELBUKEN C, REN C L. Droplet formation in microfluidic T-junction generators operating in the transitional regime. Ⅱ. Modeling[J]. Physical Review E, 2012, 85(1):016322.