高温气流中双液滴蒸发过程实验研究
|
摘要
建立了液滴蒸发的实验系统,采用悬挂液滴法对高温气流中单、双液滴的蒸发特性进行研究。实验结果表明:双液滴实验时的液滴蒸发过程与单液滴蒸发过程类似;液滴间相互作用使液滴周围蒸汽的浓度增大,气液传质浓度差减小,液滴与周围环境的传质速度降低,使蒸发速率减小;在纯辐射环境中液滴间相互作用对蒸发过程的影响较强,在辐射对流环境中液滴间相互作用对蒸发过程的影响较弱。
Droplet evaporation experimental system was established. The characteristics of single-droplet and double-droplets evaporation was studied by suspending droplets using droplet evaporation experimental equipment. The results indicated that the evaporation of doubledroplets is similar to that of single-droplet. The droplet interaction causes the coupling of steam concentration field around droplets and this raise the steam concentration around droplets, lower the mass transfer rate and the droplet evaporation rate. The droplets interaction influence on evaporation is strong in pure radiative condition and is weak in radiative-convective coupling condition.
Droplet evaporation experimental system was established. The characteristics of single-droplet and double-droplets evaporation was studied by suspending droplets using droplet evaporation experimental equipment. The results indicated that the evaporation of doubledroplets is similar to that of single-droplet. The droplet interaction causes the coupling of steam concentration field around droplets and this raise the steam concentration around droplets, lower the mass transfer rate and the droplet evaporation rate. The droplets interaction influence on evaporation is strong in pure radiative condition and is weak in radiative-convective coupling condition.
引文
[1]GRADINGER T B,BOULOUCHOS K.A Zero-Dimensional Model for Spray Droplet Vaporization at High Pressures and Temperatures[J].Int.J.Heat and Mass Transfer,1998,41:2947-2956.
[2]SPALDING D B.The Combustion of Liquid fuels[C]//Proceedings of the Fourth International Symposium in Combustion.Pittsburgh:The Combustion Institute,1953:847-864.
[3]孙凤贤,姜任秋.非等温柴油液滴对流蒸发的热膨胀与环境压力影响分析[J].热能动力工程,2008,23(3):311-315.
[4]C MAQUA,G CASTANET,F.Grisch,et al.Monodisperse Droplets Heating and Evaporation:Experimental Study and Modeling[J].International Journal of Heat and Mass Transfer,2008,51:3932-3945.
[5]D LIU,K ANDERS,A FROHN.Drag Coefficient of Single Droplets Moving in a Infinite Droplet Chain on the Axis of a Tube[J].Int.J.Multiphase Flow,1988,140(2):217-232.
[6]马力,仇性启,王健.液滴蒸发实验装置相似性设计[J].工业加热,2012,41(4):36-39.
[7]王健.错流射流中液滴蒸发理论和试验研究[D].黄岛:中国石油大学(华东),2012.
[8]余永刚,金志明.含能液滴间相互作用对着火、燃烧过程的影响[J].爆炸与冲击,1997,17(2):166-173.
[9]马力,仇性启,王健,等.高温气流中液滴蒸发特性的研究[J].石油化工,2013,42(3):298-302.
[10]苏凌宇.负压环境下燃料液滴蒸发过程的实验与理论研究[D].长沙:国防科学技术大学,2004.
[11]姚强,李水清,王宇.燃烧学导论:概念与应用[M].北京:清华大学出版社,2009.
[2]SPALDING D B.The Combustion of Liquid fuels[C]//Proceedings of the Fourth International Symposium in Combustion.Pittsburgh:The Combustion Institute,1953:847-864.
[3]孙凤贤,姜任秋.非等温柴油液滴对流蒸发的热膨胀与环境压力影响分析[J].热能动力工程,2008,23(3):311-315.
[4]C MAQUA,G CASTANET,F.Grisch,et al.Monodisperse Droplets Heating and Evaporation:Experimental Study and Modeling[J].International Journal of Heat and Mass Transfer,2008,51:3932-3945.
[5]D LIU,K ANDERS,A FROHN.Drag Coefficient of Single Droplets Moving in a Infinite Droplet Chain on the Axis of a Tube[J].Int.J.Multiphase Flow,1988,140(2):217-232.
[6]马力,仇性启,王健.液滴蒸发实验装置相似性设计[J].工业加热,2012,41(4):36-39.
[7]王健.错流射流中液滴蒸发理论和试验研究[D].黄岛:中国石油大学(华东),2012.
[8]余永刚,金志明.含能液滴间相互作用对着火、燃烧过程的影响[J].爆炸与冲击,1997,17(2):166-173.
[9]马力,仇性启,王健,等.高温气流中液滴蒸发特性的研究[J].石油化工,2013,42(3):298-302.
[10]苏凌宇.负压环境下燃料液滴蒸发过程的实验与理论研究[D].长沙:国防科学技术大学,2004.
[11]姚强,李水清,王宇.燃烧学导论:概念与应用[M].北京:清华大学出版社,2009.