Confined and Agitated Swirling Flows with Applications in Chemical Engineering |
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Authors: | Jos Derksen |
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Institution: | (1) Kramers Laboratorium voor Fysische Technologie, Delft University of Technology, Prins Bernhardlaan 6, 2628 BW Delft, The Netherlands |
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Abstract: | Turbulent, swirling flows are encountered frequently in chemical engineering practice. In this article, experiments and simulations
on two classes of swirling flows, viz. agitated flows (stirred tanks), and confined swirling flows are discussed. Results
of large-eddy simulations of stirred tank flow are compared with experimental data, mainly phase-resolved LDA data of the
flow in the vicinity of the impeller. Next to the average velocity field, also the turbulent kinetic energy, and the anisotropy
of the Reynolds stress tensor have been assessed. An important application of confined swirling flow is the cyclone separator
(hydrocyclones for the separation of liquids, gas cyclones for gas-solid separation). The flow in a swirl tube geometry exhibiting
many of the typical features of swirl flows (e.g. vortex breakdown) is discussed. Furthermore, a large-eddy simulation of
the gas flow in a high-efficiency Stairmand cyclone separator is presented. Two examples of process modeling based on flow
simulations are briefly treated: orthokinetic agglomeration of crystals in a stirred tank, and particle separation in a cyclone.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | cyclone separator large-eddy simulation LDA stirred vessel swirling flow |
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