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The gas hold-up variation and regime transition were investigated with different liquid viscosities ranging from 1.0mPas to 31.5mPas using a 0.15-m-in-diameter bubble column. In contrast to common observations, the gas hold-up graph with the superficial gas velocity could be categorized into three flow regimes: homogeneous, pseudo-homogeneous and heterogeneous flow regimes. The formation of large...
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