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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

BUBBLING REGIMES AT LARGE SUBMERGED ORIFICES

Get access (open in a dialog) DOI: 10.1615/IHTC10.5450
pages 163-168

Resumo

This paper describes an experimental investigation of bubble formation at large orifices (25.4 < D < 101.6 mm) and high gas flowrates (5 < Q < 50 litres/sec). These operating conditions extend the current knowledge of bubbling behaviour into a range underrepresented in the literature and closer to the probable conditions of a subsea oilwell blowout. Observations over this range of conditions allows classification of bubbling behaviour into three main regimes: total backflooding, double-bubbling and continuous interaction. It has been found that double-bubbling is the dominant regime in this region and that no true single bubble regime exists. Regime boundaries lie on lines of constant Froude number when pipe diameter and gas flowrute are the quantities varied. The total volume of gas released during a double-bubbling sequence is reasonably predicted by a simple buoyancy-inertia balance of a type proposed by Davidson and Schuler (1960b). An estimate of bubbling frequency and group departure volume in the periodic double-bubbling regime is also provided for a postulated full scale blowout.