醇在油相中荷电雾化的实验研究
|
摘要
电场作用下荷电多相反应系统在强化传质和相间作用方面具有显著的优势,有利于克服酯交换反应制备生物柴油过程中两相互溶性差的问题。本文基于显微高速摄像技术对油相中乙醇荷电破碎行为的演变过程进行了可视化研究,精确捕捉了不同毛细管口场强下荷电乙醇液滴破碎的显微形貌特征,探讨了电场强度影响下破碎模式的演变规律。实验结果表明,随着毛细管口电场强度的增加,醇在油相中的荷电雾化依次经历了滴状模式、单滴破碎模式、枝权状破碎模式及膜状破碎模式,且生成液滴的尺寸逐渐减小。膜状破碎模式下,形成大量微小液滴,可快速实现油醇两相的混合,为酯交换反应过程提供一种有利的反应环境。
under high electric field intensity,charged multiphase reaction systems have dominant advantages in enhancing mass transfer and phase interaction which can overcome the poor solubility of two phases in the process of biodiesel production by transesterification.By means of high-speed microscopy,visualization on the evolution process of charged ethanol dispersion in oil has been reported.Microphotograph characters of charged ethanol are accurately captured and regulation evolution of breakup models is discussed under different electric field intensity at capillary tip.The results show that the breakup models of ethanol in oil experience the following models in turns:single droplet model,single droplet breakup model,branch breakup model and membrane breakup model.In membrane breakup model,the droplet sizes were very small,achieving well mixing of oil and alcohol,which supplied a good reaction environment for transesterification reaction.
under high electric field intensity,charged multiphase reaction systems have dominant advantages in enhancing mass transfer and phase interaction which can overcome the poor solubility of two phases in the process of biodiesel production by transesterification.By means of high-speed microscopy,visualization on the evolution process of charged ethanol dispersion in oil has been reported.Microphotograph characters of charged ethanol are accurately captured and regulation evolution of breakup models is discussed under different electric field intensity at capillary tip.The results show that the breakup models of ethanol in oil experience the following models in turns:single droplet model,single droplet breakup model,branch breakup model and membrane breakup model.In membrane breakup model,the droplet sizes were very small,achieving well mixing of oil and alcohol,which supplied a good reaction environment for transesterification reaction.
引文
[1]Durham K G.Space Charge Deposition of Pesticide onto Cylindrical Target Arrays[J].Transactions of the ASAEAmerican Society of Agricultural Engineers(USA),1985,28(3):658-664
[2]王贞涛,闻建龙,陈燕,等.静电雾化理论及应用技术研究进展[J].排灌机械,2004,22(6):41-44WANG Zhentao,WEN Jianlong,CHEN Yan et al.The Research Progress of Electrostatic Atomization Theory and Applied Technology[J].Journal of Drainage and Irrigation Machinery Engineering,2004,22(6):41-44
[3]Jaworek A,Krupa A.Main Modes of Electrohydrodynamic Spraying of Liquid[C]//Third International Conference on Multiphase Flow,Lyon,France,1998
[4]Jaworek A,Krupa A.Classification of the Modes of EHD Spraying[J].Journal of Aerosol Science,1999,30(7):873-893
[5]Rayleigh L.On the Equilibrium of Liquid Conducting Masses Charged With Electricity[J].The London,Edinburgh,and Dublin Philosophical Magazine and Journal of Science,1882,14(87):184-186
[6]Jaworek A,Krupa A.Jet and Drops Formation in Electrohydrodynamic Spraying of Liquids[J].Experiments in Fluids,1999,27:43-52
[7]Galinat S,Torres L G and Masbernat O.Breakup of a Drop in a Liquid-Liquid Pipe Flow through an Orifice[J].AIChE Journal,2007,53(1):56-68
[8]Rodriguez H,Arce A and Soto A.Liquid-Liquid Interfacial Tension of Equilibrated Mixtures of Ionic Liquids and Hydrocarbons[J].Science China Chemistry,2012,55(8):1519-1524
[9]Eow J S,Ghadiri M.Motion,Deformation and Breakup of Aqueous Drops in Oils under High Electric Field Strengths[J].Chemical Engineering and Processing:Process Intensification,2003,42(4):259-272
[10]Feng J Q,Scott T C.A Computational Analysis of Electrohydrodynamics of a Leaky Dielectric Drop in an Electric Field[J].Journal of Fluid Mechanics,1996,311:289-326
[11]Sato M,Hatori T,Saito M.Experimental Investigation of Droplet Formation Mechanisms by Electrostatic Dispersion in a Liquid-Liquid System[J].Industry Applications,IEEE Transactions on,1997,33(6):1527-1534
[12]Eilhann E,Kwon,Haakrho Y and Jongseok P.NonCatalytic Heterogeneous Biodiesel Production via a Continuous Flow System[J].Bioresource Technology,2012,114(2):370-374
[13]Sawangkeaw R.Bunyakiat K and Ngamprasertsith S,A Review of Laboratory-Scale Research on Lipid Conversion to Biodiesel With Supercritical Methanol[J].The Journal of Supercritical Fluids,2010,55(1):1-13
[14]Fukuda H,Kondo A and Noda H.Biodiesel Fuel Production by Transesterification of Oils[J].Journal of Bioscience and Bioengineering,2001,92(5):405-416
[15]Gog A,Roman M,Toa M,et al.Biodiesel Production Using Enzymatic Transesterification-Current State and Perspectives[J].Renewable Energy,2012,39(1):10-16
[16]王勇.高电压脉冲电场连续化处理生产生物柴油的研究[D].吉林:吉林大学,2008WANG Yong.Study on Production of Biodiesel Continuously by High Intensity Pulsed Electric Fields[D].Jilint Jilin University,2008
[17]Qiu Z.Intensification of Liquid-Liquid Contacting Processes[D].University of Kansas,2010
[18]Coelho R,and Debeau J.Properties of the Tip-Plane Configuration[J].Journal of Physics D:Applied Physics,1971,4(9):1266-1280
[2]王贞涛,闻建龙,陈燕,等.静电雾化理论及应用技术研究进展[J].排灌机械,2004,22(6):41-44WANG Zhentao,WEN Jianlong,CHEN Yan et al.The Research Progress of Electrostatic Atomization Theory and Applied Technology[J].Journal of Drainage and Irrigation Machinery Engineering,2004,22(6):41-44
[3]Jaworek A,Krupa A.Main Modes of Electrohydrodynamic Spraying of Liquid[C]//Third International Conference on Multiphase Flow,Lyon,France,1998
[4]Jaworek A,Krupa A.Classification of the Modes of EHD Spraying[J].Journal of Aerosol Science,1999,30(7):873-893
[5]Rayleigh L.On the Equilibrium of Liquid Conducting Masses Charged With Electricity[J].The London,Edinburgh,and Dublin Philosophical Magazine and Journal of Science,1882,14(87):184-186
[6]Jaworek A,Krupa A.Jet and Drops Formation in Electrohydrodynamic Spraying of Liquids[J].Experiments in Fluids,1999,27:43-52
[7]Galinat S,Torres L G and Masbernat O.Breakup of a Drop in a Liquid-Liquid Pipe Flow through an Orifice[J].AIChE Journal,2007,53(1):56-68
[8]Rodriguez H,Arce A and Soto A.Liquid-Liquid Interfacial Tension of Equilibrated Mixtures of Ionic Liquids and Hydrocarbons[J].Science China Chemistry,2012,55(8):1519-1524
[9]Eow J S,Ghadiri M.Motion,Deformation and Breakup of Aqueous Drops in Oils under High Electric Field Strengths[J].Chemical Engineering and Processing:Process Intensification,2003,42(4):259-272
[10]Feng J Q,Scott T C.A Computational Analysis of Electrohydrodynamics of a Leaky Dielectric Drop in an Electric Field[J].Journal of Fluid Mechanics,1996,311:289-326
[11]Sato M,Hatori T,Saito M.Experimental Investigation of Droplet Formation Mechanisms by Electrostatic Dispersion in a Liquid-Liquid System[J].Industry Applications,IEEE Transactions on,1997,33(6):1527-1534
[12]Eilhann E,Kwon,Haakrho Y and Jongseok P.NonCatalytic Heterogeneous Biodiesel Production via a Continuous Flow System[J].Bioresource Technology,2012,114(2):370-374
[13]Sawangkeaw R.Bunyakiat K and Ngamprasertsith S,A Review of Laboratory-Scale Research on Lipid Conversion to Biodiesel With Supercritical Methanol[J].The Journal of Supercritical Fluids,2010,55(1):1-13
[14]Fukuda H,Kondo A and Noda H.Biodiesel Fuel Production by Transesterification of Oils[J].Journal of Bioscience and Bioengineering,2001,92(5):405-416
[15]Gog A,Roman M,Toa M,et al.Biodiesel Production Using Enzymatic Transesterification-Current State and Perspectives[J].Renewable Energy,2012,39(1):10-16
[16]王勇.高电压脉冲电场连续化处理生产生物柴油的研究[D].吉林:吉林大学,2008WANG Yong.Study on Production of Biodiesel Continuously by High Intensity Pulsed Electric Fields[D].Jilint Jilin University,2008
[17]Qiu Z.Intensification of Liquid-Liquid Contacting Processes[D].University of Kansas,2010
[18]Coelho R,and Debeau J.Properties of the Tip-Plane Configuration[J].Journal of Physics D:Applied Physics,1971,4(9):1266-1280