液滴撞击固体表面过程的实验研究
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摘要
对液滴撞击固体表面的过程进行实验研究,考察液滴的物性和操作条件对撞击过程的影响,结果表明:随着液滴黏度的增加、或表面张力系数的增大、或撞击速度的减小,液滴的铺展直径、铺展速度和铺展面积均减小;液滴的能量在黏性中的耗散主要发生在撞击的初始阶段,随着液滴黏度的增加、或表面张力系数的减小、或撞击速度的增大,黏性耗散的速率均增加。本文得到的关于液滴雷诺数和韦伯数的关联式可用于预测液滴的最大铺展直径和最大铺展面积。
An experimental study of droplets impacting on a solid surface had been carried out in order to investigate the influence of the physical properties of the droplets and operating conditions on the impact process.The results show that as the viscosity of the droplet increases, the surface tension coefficient increases, or the impact velocity decreases, the spreading diameter, spreading speed and spreading area of the droplet all decrease. The dissipation of the energy of the droplet mainly occurs in the initial stage of the impact.As the viscosity of the droplet increases, the surface tension coefficient decreases, or the impact velocity increases, the rate of viscous dissipation increases. The correlations with the Reynolds number and the Weber number of the droplets obtained in this work can be used to predict the maximum spreading diameter and the maximum spreading area of the droplet.
An experimental study of droplets impacting on a solid surface had been carried out in order to investigate the influence of the physical properties of the droplets and operating conditions on the impact process.The results show that as the viscosity of the droplet increases, the surface tension coefficient increases, or the impact velocity decreases, the spreading diameter, spreading speed and spreading area of the droplet all decrease. The dissipation of the energy of the droplet mainly occurs in the initial stage of the impact.As the viscosity of the droplet increases, the surface tension coefficient decreases, or the impact velocity increases, the rate of viscous dissipation increases. The correlations with the Reynolds number and the Weber number of the droplets obtained in this work can be used to predict the maximum spreading diameter and the maximum spreading area of the droplet.
引文
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[16] SCHELLER B L,BOUSFIELD D W.Newtonian drop impact with a solid surface [J].AIChE Journal,1995,41(6):1357- 1367.
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[2] 祝杰,吴振元,叶世超,等.喷淋塔内液滴运动及分布特性的研究[J].化工与医药工程,2014,35(2):11- 15.ZHU J,WU Z Y,YE S C,et al.Research on characteristics of droplet motion and distribution in spray tower [J].Chemical and Pharmaceutical Engineering,2014,35(2):11- 15.(in Chinese)
[3] LI N,ZHOU Q L,CHEN X,et al.Liquid drop impact on solid surface with application to water drop erosion on turbine blades,Part Ⅰ:Nonlinear wave model and solution of one-dimensional impact[J].International Journal of Mechanical Sciences,2008,50(10/11):1526- 1542.
[4] AI T,MUDASSAR A M,CAI Z Q,et al.Liquid dispersion and gas absorption in a multi stage high speed disperser [J].Chemical Engineering Journal,2018,352:704- 715.
[5] MAO T,KUHN D C S,TRAN H.Spread and rebound of liquid droplets upon impact on flat surfaces [J].AIChE Journal,1997,43(9):2169- 2179.
[6] ZHANG X G,BASARAN O A.Dynamic surface tension effects in impact of a drop with a solid surface [J].Journal of Colloid and Interface Science,1997,187(1):166- 178.
[7] 李维仲,朱卫英,权生林,等.液滴撞击水平固体表面的可视化实验研究[J].热科学技术,2008,7(2):155- 160.LI W Z,ZHU W Y,QUAN S L,et al.Visual experimental study on droplet impacted onto horizontal solid surface [J].Journal of Thermal Science and Technology,2008,7(2):155- 160.(in Chinese)
[8] 崔洁,陆军军,陈雪莉,等.液滴高速撞击固体板面过程的研究[J].化学反应工程与工艺,2008,24(5):390- 394.CUI J,LU J J,CHEN X L,et al.Study of liquid droplet impacting on a solid surface with high velocity [J].Chemical Reaction Engineering and Technology,2008,24(5):390- 394.(in Chinese)
[9] AN S M,LEE S Y.Maximum spreading of a shear thinning liquid drop impacting on dry solid surfaces [J].Experimental Thermal and Fluid Science,2012,38:140- 148.
[10] ABOUD D G K,KIETZIG A M.Splashing threshold of oblique droplet impacts on surfaces of various wettability [J].Langmuir,2015,31(36):10100- 10111.
[11] CHANDRA S,AVEDISIAN C T.On the collision of a droplet with a solid surface [J].Proceedings of the Royal Society of London.Series A:Mathematical,Physical and Engineering Sciences,1991,432(1884):13- 41.
[12] PASANDIDEH-FARD M,QIAO Y M,CHANDRA S,et al.Capillary effects during droplet impact on a solid surface [J].Physics of Fluids,1996,8(3):650- 659.
[13] ?IKALO ?,WILHELM H D,ROISMAN I V,et al.Dynamic contact angle of spreading droplets:experiments and simulations [J].Physics of Fluids,2005,17(6):062103.
[14] LUNKAD S F,BUWA V V,NIGAM K D P.Numerical simulations of drop impact and spreading on horizontal and inclined surfaces [J].Chemical Engineering Science,2007,62(24):7214- 7224.
[15] WANG Y X,CHEN S.Droplets impact on textured surfaces:mesoscopic simulation of spreading dynamics [J].Applied Surface Science,2015,327:159- 167.
[16] SCHELLER B L,BOUSFIELD D W.Newtonian drop impact with a solid surface [J].AIChE Journal,1995,41(6):1357- 1367.
[17] CLANET C,BéGUIN C,RICHARD D,et al.Maximal deformation of an impacting drop [J].Journal of Fluid Mechanics,2004,517:199- 208.
[18] ROISMAN I V.Inertia dominated drop collisions.II.An analytical solution of the Navier-Stokes equations for a spreading viscous film [J].Physics of Fluids,2009,21(5):052104.
[19] CHEN R H,WANG H W.Effects of tangential speed on low-normal-speed liquid drop impact on a non-wettable solid surface[J].Experiments in Fluids,2005,39(4):754- 760.
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