Experimental study on mixing dynamic characteristics during down-flow spray within finite section channel

Zhaocheng NIU; Dan ZHANG; Huihui WANG; Zhenzhen WANG; Caizhi DENG

doi:10.11949/0438-1157.20190345

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Experimental study on mixing dynamic characteristics during down-flow spray within finite section channel

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Experimental study on mixing dynamic characteristics during down-flow spray within finite section channel
- CIESC Journal Vol. 70, Issue S2, Pages: 117-122(2019)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室，陕西西安 710049
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190345
  CLC： TK 124
- Received：03 April 2019，
  
  Revised：2019-04-26，
  
  Published：05 September 2019
- 稿件说明：
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牛照程, 张丹, 王辉辉, 王珍珍, 邓才智. 有限截面通道内喷雾顺流掺混动力学特征的实验研究[J]. 化工学报, 2019, 70(S2): 117-122

NIU Zhaocheng, ZHANG Dan, WANG Huihui, WANG Zhenzhen, DENG Caizhi. Experimental study on mixing dynamic characteristics during down-flow spray within finite section channel[J]. CIESC Journal, 2019, 70(S2): 117-122
牛照程, 张丹, 王辉辉, 王珍珍, 邓才智. 有限截面通道内喷雾顺流掺混动力学特征的实验研究[J]. 化工学报, 2019, 70(S2): 117-122 DOI： 10.11949/0438-1157.20190345.

NIU Zhaocheng, ZHANG Dan, WANG Huihui, WANG Zhenzhen, DENG Caizhi. Experimental study on mixing dynamic characteristics during down-flow spray within finite section channel[J]. CIESC Journal, 2019, 70(S2): 117-122 DOI： 10.11949/0438-1157.20190345.

摘要

设计搭建了有限截面通道顺流喷雾掺混实验台，在横截面为70 mm×70 mm的透明方形掺混段内，将室温水经喷嘴雾化后顺流掺入不同流速的室温空气。实验中，喷水压力为0.1～1.5 MPa，风速为14.6～46.2 m∙s

-1

。分别采用高速摄影和马尔文粒度仪对该雾羽的速度场和初始粒径等动力学特征开展了实验研究。结果指出：掺混雾羽的径向速度及喷射轴线附近的轴向速度主要受制于喷水压力；而雾羽两翼处的轴向速度主要受风速影响。定义轴向平均速度为雾羽轴向特征速度，该平均速度随喷水压力或喷射距离的增大而增大；在喷水压力小时，风速的增大可使轴向平均速度随喷射距离增大的速率提高；在喷水压力高时则反之。掺混雾羽的初始粒径随喷水压力的减小或喷嘴出口处气液相对速度的增大而减小。最后，根据实验结果拟合了轴向平均速度和初始粒径的实验关联式，其计算值与实验值吻合良好。

Abstract

Experimental study on mixing dynamic characteristics during down-flow spraying water into air at different speeds was carried out. The spray pressure varied between 0.1—1.5 MPa

and air speed between 14.6 m∙s

-1

and 46.2 m∙s

-1

. The mix chamber was a transparent rectangle channel with cross section of 70 mm×70 mm. The velocity field and initial droplets size distribution were respectively measured by high speed photography and Malvern particle size meter. Results suggested that spray pressure mainly affected radial velocity and the axial velocity alongside spray axis. While the air speed mainly affected the axial velocity at outside boundary of plume. The mean axial velocity was introduced and used as the reference velocity for mixing. It was found increased with increasing spray distance or spray pressure. The initial particle size decreased with decreasing spray pressure or increasing relative velocity between air and water at nozzle exit. According to above experimental results

correlations for the mean axial velocity and initial droplet size was set up. The relative error between calculated and experimental results mainly fell within ±15%.

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references

陈磊 , 费学宁 , 季民 , 等 . 喷雾蒸发处理浓盐水分离效率研究 [J]. 中国给水排水 , 2015 , 31 ( 5 ): 96 - 99+104 .

Chen L , Fei X N , Ji M , et al . Study on separation efficiency of concentrated brine in spray evaporation process [J]. China Water & Wastewater , 2015 , 31 ( 5 ): 96 - 99+104 .

成怀刚 , 高从堦 . 喷雾蒸发海水淡化技术研究进展 [J]. 现代化工 , 2008 , ( 6 ): 19 - 22+24 .

Cheng H G , Gao C J . Progress in spray evaporation desalination technology [J]. Modern Chemical Industry , 2008 , ( 6 ): 19 - 22+24 .

Lerner J E . Method for desalination and fresh water recovery : US 5207928 [P]. 1993-5-4 .

Hartman W F , Kepley L J , Van Fox J . Apparatus and method for thermal desalination based on pressurized formation and evaporation of droplets : US 6699369 [P]. 2004-3-30 .

Amara M B , Houcine I , Guizani A , et al . Experimental study of a multiple-effect humidification solar desalination technique [J]. Desalination , 2004 , 170 ( 3 ): 209 - 221 .

陈磊 . 介观喷雾蒸发分离高浓度盐水处理系统的构建及性能研究 [D]. 天津 : 天津大学 , 2015 .

Chen L . Research on high concentration brine disposal technology based on mesoscopic spray evaporation system [D]. Tianjin : Tianjin University , 2015 .

张海滨 , 白博峰 , 刘利 , 等 . 受限空间内空心锥形喷雾-横流掺混规律 [J]. 化工学报 , 2012 , 63 ( 5 ): 1354 - 1359 .

Zhang H B , Bai B F , Liu L , et al . Mixing characteristics of hollow cone spray with confined crossflow [J]. CIESC Journal , 2012 , 63 ( 5 ): 1354 - 1359 .

孙慧娟 , 张海滨 , 白博峰 . 雾化锥角对喷雾在横流中蒸发掺混的影响 [J]. 固体火箭技术 , 2013 , 36 ( 1 ): 50 - 55 .

Sun H J , Zhang H B , Bai B F . Effect of spray angle on mixing of evaporating spray in crossflow [J]. Journal of Solid Rocket Technology , 2013 , 36 ( 1 ): 50 - 55 .

孙慧娟 , 白博峰 , 张海滨 , 等 . 喷嘴入射方式对气体-液滴群掺混的影响 [J]. 固体火箭技术 , 2009 , 32 ( 5 ): 492 - 495+510 .

Sun H J , Bai B F , Zhang H B , et al . Effect of different injection angles on gas-droplets two phase flow mixing characteristics [J]. Journal of Solid Rocket Technology , 2009 , 32 ( 5 ): 492 - 495+510 .

陈小艳 , 周鹜 , 黄燕 , 等 . 大型喷雾粒径分布的图像法测量 [J]. 化工学报 , 2014 , 65 ( 2 ): 480 - 487 .

Chen X Y , Zhou W , Huang Y , et al . Image method for measuring the particle size distribution of large sprays [J]. CIESC Journal , 2014 , 65 ( 2 ): 480 - 487 .

王辉辉 , 张丹 , 牛照程 , 等 . 喷射闪蒸中液滴群速度场的测量 [C]// 多相流年会会议论文集 . 北京 , 2018 : 183271 .

Wang H H , Zhang D , Niu Z C , et al . Measurement of atomization velocity field in spray flash [C]// Proceedings of Annual Conference on Multiphase Flow . Beijing , 2018 : 183271 .

Robert M . Contributions to the theory of single-sample uncertainty analysis [J]. Journal of Fluids Engineering-Transactions of the ASME , 1982 , 104 : 250 - 260 .

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