Authors: HongBing Xiong LiJuan Qian JianZhong Lin
Publish Date: 2011/12/20
Volume: 21, Issue: 2, Pages: 226-239
Abstract
In this paper a comprehensive model was developed to investigate the suspension spray for a radio frequency RF plasma torch coupled with an effervescent atomizer Firstly the RF plasma is simulated by solving the thermofluid transport equations with electromagnetic Maxwell equation Secondly primary atomization of the suspension is solved by a proposed onedimensional breakup model and validated with the experimental data Thirdly the suspension droplets and discharged nanoparticles are modeled in Lagrangian manner to calculate each particle tracking acceleration heating melting and evaporation Saffman lift force Brownian force and noncontinuum effect are considered for nanoparticle momentum transfer as well as the effects of evaporation on heat transfer This model predicts the nanoparticle trajectory velocity temperature and size in the RF suspension plasma spray Effects of the torch and atomizer operating conditions on the particle characteristics are investigated Such operating conditions include gastoliquid flow ratio atomizer orifice diameter injection pressure power input level plasmas gas flow rate and powder material The statistical distributions for the multiple particles are also discussed for different cases
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