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MECHANISMS OF PARTICLE DISPERSION AND DEPOSITION IN A TURBULENT SQUARE DUCT FLOW

Jun Yao
Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK

Michael Fairweather
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

要約

Particle dispersion in a square duct flow is studied using large eddy simulation combined with Lagrangian particle tracking under conditions of one-way coupling. The flow has a bulk Re = 250k, with six particle sizes ranging from 5 to 1000 μm examined. For the particles, predictions demonstrate that secondary flows within the duct dominate small particle dispersion, and result in a uniform distribution, whilst gravity promotes the deposition of large particles on the duct floor. A detailed analysis of the influence of the flow on particle distribution is provided through consideration of the particle dispersion function.