STUDIES OF MAGNETITE DEPOSITION FROM A FLOWING SUSPENSION

作者：I. H. Newson, T. Reg. Bott, C. I. Hussain · 发表于：Chemical Engineering Communications · 年份：1983 · DOI：10.1080/00986448308940597 · 被引用次数：29 · 研究领域：Particle Dynamics in Fluid Flows、nanoparticles nucleation surface interactions、Cyclone Separators and Fluid Dynamics

The deposition of magnetite from flowing water suspensions is a problem particularly important in boiler plant. Measurements have been made of the rate of deposition of magnetite particles from suspension in demincraliscd water pumped through vertical aluminium tubes of 19 mm bore over a range of temperatures I2-75°C and Reynolds number 7900 to 88500 under isothermal conditions. Bulk concentrations of magnetite particles (of the order of 2 μm diameter) were in the range 200-600 ppm. It would appear that deposition is mass transfer controlled. The initial deposilion rate for a given temperature and concentration varies as the suspension velocity to the power 0.73. The measured asymptotic deposition quantity varies as the suspension velocity to the power −0.66. The conclusions imply a sticking probability for the magnetite on to the aluminium lube walls as 1 for the experimental conditions.