Thermophoretic augmentation of particle deposition in natural convection flow through a parallel plate channel

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• 作者：K. K. Dinesh and S. Jayaraj
• 刊名：Heat and Mass Transfer
• 出版年：2008
• 出版时间：October, 2008
• 年：2008
• 卷：44
• 期：12
• 页码：1519-1527
• 全文大小：438.3 KB

文摘

Present paper deals with temperature driven mass deposition rate of particles known as thermophoretic wall flux when a hot flue gas in natural convection flow through a cooled isothermal vertical parallel plate channel. Present study finds application in particle filters used to trap soot particles from post combustion gases issuing out of small furnaces with low technical implications. Governing equations are solved using finite difference marching technique with channel inlet values as initial values. Channel heights required to regain hydrostatic pressure at the exit are estimated for various entry velocities. Effect of temperature ratio between wall and gas on thermophoretic wall flux is analysed and wall flux found to increase with decrease in temperature ratio. Results are compared with published works wherever possible and can be used to predict particle deposition rate as well as the conditions favourable for maximum particle deposition rate.