Abstract
New, reliable, and innovative methods (the new hybrid index (NHI) and the information index (II)) for flow regime (FR) identification in bubble columns (BCs) operated with air–deionized water or nitrogen–tap water systems (at ambient conditions), as well as nitrogen–ethanol systems (at pressures of 0.1 and 0.3 MPa) systems have been successfully developed. New parameters extract useful hidden information from time series measurements by division of various signals (gas holdup, differential pressure (DP) and gauge pressure fluctuations) into different equal parts. Salient advantage of the new parameters is that their definitions are not based on any assumption.
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