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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/114881

    Title: Hydrodynamic Behaviour of Helical Rings Random Packing Using CFD Simulation
    Authors: Jia-LinKang;Ya-Cih Ciou;Dong-Yang Lin;Ching-Hung Cheng;David Shan-Hill Wong;Shi-Shang Jang
    Keywords: computational fluid dynamics;random packing;helical Rings;Hydrodynamic Behaviour
    Date: 2018-07
    Issue Date: 2018-09-05 12:10:13 (UTC+8)
    Abstract: This study presented computational fluid dynamics (CFD) and experimental validation
    of hydrodynamic behavior of helical rings random packing. Random packings have been
    widely used in chemical industries in absorbers, strippers etc. Up till now, development
    of novel random packing structure has essentially been empirical. Even with the
    increased computing power, CFD simulations of random packings are hard to find in the
    literature. The random nature of the packing structures, and the stacked geometry make
    acceptable grid generation and convergence very difficult because the structure of random
    packing is complicated when large amounts of it are stacked in a column. In this work,
    a CFD model was first time developed to simulate countercurrent gas-liquid flow in
    random packings formed by helical rings. Gravity simulation was used to generate
    stacking structures. A simple feedback control scheme was applied to control the gas
    inlet flow rate so that a particular pressure. Multiphase model was employed to compute
    the gas and liquid interaction in which the surface tension and wall contact angle were
    found as key factors. The predictions of the CFD model were validated with a lab-scale
    packed-bed absorber. It was found that the helical structure did increase the interfacial
    area, liquid hold-up when compared to Raschig rings, and such predictions can be
    validated by our in-house experiment. The model also showed that helical rings will have
    lower pressure drop and can sustain a larger liquid-gas ratios compared to Raschig rings
    . In summary, our study found that CFD simulations can obtain reasonable predictions
    of hydrodynamic behaviour of packings, and the inclusion of microstructures into a
    packing element will improve its hydrodynamic properties. These results showed that
    CFD can be used as a basis for rational packing design.
    Relation: Computer Aided Chemical Engineering 44, p.817-822
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Proceeding

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