Abstract
Observation was made of the generation of liquid plugs in an inclined circular pipe subjected to a sudden change in the gravity level. The drop shaft of the Japan Microgravity Center ( JAMIC) was used to realize the gravity level change from the normal gravity to microgravity. The liquid plugs were first generated near the bottom of the pipe and subsequently generated toward the top of the pipe. The center and film thickness of the liquid plug and the transient time for the generation of the liquid plug were determined. Empirical relations were derived for these quantities.
