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- W1539275384 abstract "Computational Fluid Dynamic (CFD) and mechanistic models of gas-liquid flow and mass transfer at turbulent conditions are useful for studying local inhomogeneities and operation conditions of gas-liquid stirred tanks. They are applicable also as scale-up and design tools of gas-liquid stirred tank reactors and other gas-liquid contacting devices with greater confidence compared to purely heuristic design methods. Experiments are needed for the development and the verification of these models. Various flow visualisation techniques have been utilised to obtain experimental results from local gas hold-ups and bubble size distributions (BSD) in a gas-liquid mixed tank. Particle Image Velocimetry (PIV), Phase Doppler Anemometry (PDA), Capillary suction probe (CSP), High-speed video imaging (HSVI) and Electrical Resistance Tomography (ERT) techniques have been applied. The applicability of various techniques is dependent on the location of the measurement, the physical properties of the gas-liquid flow, the gas hold-up and the size of the tank. Local characteristics of the gas-liquid flow have been measured for air-water dispersion in a baffled 13.8 dm3 mixed tank at various gas feeds and impeller rotational speeds. BSDs have been measured in the tank using CSP, PIV and PDA techniques. CSP, PIV and ERT have been used for the determination of local gas hold-ups. HSVI has been applied for the visualisation of the breakage, the coalescence and the shapes of the bubbles. Results from the applied techniques have been compared with each other and their advantages, disadvantages and limitations have been discussed." @default.
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- W1539275384 date "2003-01-01" @default.
- W1539275384 modified "2023-09-24" @default.
- W1539275384 title "Comparison of various flow visualisation techniques in a gas-liquid mixed tank" @default.
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- W1539275384 doi "https://doi.org/10.1016/s1570-7946(03)80210-9" @default.
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