Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (5): 1-8.doi: 10.3969/j.issn.1000-565X.2014.05.001

• Electronics, Communication & Automation Technology •     Next Articles

Numerical Investigation into Flow Field Distribution in High- Power LED Phosphor Coating Process

Guo Qi- wei Hu Yue- ming Li Zhi- fu   

  1. Engineering Research Center for Precision Electronic Manufacturing Equipments of the Ministry of Education∥ School ofAutomation Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2013-02-12 Revised:2014-03-25 Online:2014-05-25 Published:2014-04-01
  • Contact: 郭琪伟(1983-)，男，博士生，主要从事 LED 封装技术、荧光粉涂覆研究． E-mail:keavykwok@vip.qq.com
  • About author:郭琪伟(1983-)，男，博士生，主要从事 LED 封装技术、荧光粉涂覆研究．
  • Supported by:

    国家 “863” 计划项目(2012AA041312);广东省战略性新兴产业专项资金 LED 产业项目(2010A081002007)

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Abstract:

In this paper,the transportation and atomization of phosphor glue flowing in high- power LED (LightEmitting Diode) phosphor coating process were investigated via CFD (Computational Fluid Dynamics) and numericalsimulations,and the 3D flow field models as well as the mathematical models of phosphor were established to de-scribe the velocity distribution of phosphor glue's flow field between two different spraying guns.Moreover,sprayingexperiments were carried out,and the consistency of simulated results with experimental ones was proved.It isfound that numerical simulation helps accurately predict the phosphor droplets trajectories and the velocity distribu-tion in LED phosphor coating process without establishing any models of atomization process; and that,within thesame spray distance,small phosphor droplet with high velocity may result in short acceleration and deceleration dis-tance.

Key words: high- power light emitting diode, atomized spraying, process modeling, numerical simulation, phos-phor droplets trajectory