Flow Pattern Transition in Riser Due to Instability of Voidage Wave

Monji, Hideaki; Joussellin, Florence; Morioka, Shigeki

doi:10.1143/jpsj.57.1957

J. Phys. Soc. Jpn.

1988

DOI: 10.1143/jpsj.57.1957

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Flow Pattern Transition in Riser Due to Instability of Voidage Wave

Hideaki Monji

Florence Joussellin

Shigeki Morioka

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1993

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Transition mechanism from bubble flow to slug flow in a riser

Monji

1993

Fluid Dyn. Res.

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An experiment was performed to examine the mechanism of flow pattern transition from bubble flow to slug flow in a riser. The flow was measured by a double resistivity probe system, and photographs of the flow were taken using strobe lights. The negative diffusion distance of bubbles was estimated using a voidage wave equation and compared with the interbuhble distance. The flow pattern transition from bubble flow to slug flow occurred when the diffusion distance was larger than the interbubble distance. Conversely, when the diffusion distance was smaller than the interbubble distance, the bubble flow was sustained.Therefore, it is found that the negative diffusion caused by the instability of the voidage wave brings about the flow pattern transition.f Imin. The pressure was lower than the atmospheric pressure. The flow pattern transition occurred apparently at the highest but not at the lowest air flow rate. Some photographs of the flow pattern were taken along the riser, and the bubble flow characteristics (passage of bubbles, void fraction and bubble velocity) were measured using a double resistivity probe system.

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Transition mechanism from bubble flow to slug flow in a riser

Monji

1993

Fluid Dyn. Res.

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Flow Pattern Transition in Riser Due to Instability of Voidage Wave

Cited by 1 publication

References 6 publications

Transition mechanism from bubble flow to slug flow in a riser

Transition mechanism from bubble flow to slug flow in a riser

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