气体诱导涡轮搅拌的搅拌反应釜中的二相流的研究.docx

附录B：英文原文及翻译A study on the two-phase flow in a stirred tank reactoragitated by a gas-inducing turbineabstractExperimental and numerical studies of a gas–liquid two-phase flow have been applied to a non-baffled laboratory-scale stirred tank reactor, mechanically agitated by a gas-inducing turbine. The dispersion of air as gas phase into isopropanol as liquid phase at room temperature under different stirrer speeds was investigated. The X-ray cone beam computedtomography (CBCT) measurements have been taken at five different stirrer speeds starting from 1000 rpm at which the gas inducement occurs for the given operating conditions.The considerable difficulties in acquiring the phase distribution due to beam hardening and radiation scattering effects have been overcome by developing a suitable measurement setup as well as by calibration and software correction methods to achieve high accuracy. The computational fluid dynamics analyses of the stirred tank reactor have been performed in 3D with CFX 10.0 numerical software. The simplified numerical setup of mono-dispersed bubbles, constant drag coefficient and the k–e turbulence model was able to capture both the bubble induction and dispersion and the free surface vortex formation. Despite the assumed simplifications, the numerical predictions exhibit a good agreement with the experimental data.Keywords:Stirred tank reactor;Gas-inducing impeller;CFD;X-ray computed tomographyMixing.IntroductionGas–liquid mixing in stirred tank reactors is a commonprocess in the industry. It is regarded as one of the mostdifficult to tackle because of its complexities in terms of flowregimes and multiphase operations. Traditionally, the gas–liquid stirred tankreactor is equipped with an impellerresponsible for dispersing the gas phase, which is usuallysupplied via a single pipe or a ring sparger mounted beneaththe impeller. The gas-inducing impellers provide an alternativegas injection, in which case the gas is sucked via ahollow shaft and f