02105nas a2200157   4500008004100000245008900041210006900130260000800199300001200207490000800219520153600227100003001763700001701793700002201810856011501832       2017                        eng d00aElectrical resistance tomography for gas holdup in a gas-liquid stirred tank reactor0 aElectrical resistance tomography for gas holdup in a gasliquid s  cOCT  a476-4900 v1703 aGas-Liquid flows in stirred tank reactors (STR) are used in many significant industrial operations such as hydrogenation, absorption, stripping, oxidation, hydrogenation, ozonation, chlorination, fermentation, etc. Gas-Liquid STRs are expected to perform several functions such as mixing, dispersing gas into liquid, mass and heat transfer and reactions. Gas hold up distribution and various flow regimes are the key parameters affecting performance of gas-liquid STRs. Various techniques such as visual analysis, photography, light attenuation, optical probe method are used to understand gas hold-up distribution within stirred tanks. Most of these techniques have some limitations with respect to measurement of gas hold up distribution. Electrical Resistance Tomography (ERT) is an upcoming technique for obtaining both qualitative and quantitative data on multiphase process units non-invasively and non-intrusively. In this work, an attempt was made to establish and validate the ERT technique for characterizing gas-liquid flows in a laboratory scale STR using the Rushton turbine impeller. ERT was used to study gas holdup and to identify flow regimes. The results were compared with the visual measurements as well as previously published correlations. The effect of gas flow rate, impeller speed on the mean gas holdup is discussed. The methodology and results presented in this work will be useful to effectively apply ERT for characterizing gas-liquid flows in stirred tanks. (C) 2017 Elsevier Ltd. All rights reserved.1 aSardeshpande, Madhavi, V.1 aGupta, Suraj1 aRanade, Vivek, V.  uhttps://library.ncl.res.in/content/electrical-resistance-tomography-gas-holdup-gas-liquid-stirred-tank-reactor