The drift velocity of a gas bubble penetrating into a quiescent viscous liquid which initially fills a short pispe has been determined both with a commercial CFD software and with a 1-D transient flow simulator. The results obtained agree fairly well with the limited published data and show that the phenomenon under investigation is more complex than expected. In particular it has been found that for large liquid viscosity, the bubble drift velocity decreases along the pipe. This result, which can be easily justified on a theoretical ground, poses some clear limitations to the use of the standard closure equations used to model gas-liquid slug flow in pipes.

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