Duct with spiral groove

F - Mech Eng,Light,Heat,Weapons – 15 – D

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F15D 1/06 (2006.01) F16L 9/00 (2006.01)

Patent

CA 2483366

A duct (10) for transporting a two phase mixture has a length portion of circular cross-section (12) leading, via a transition zone (14) in which the duct cross-section changes from circular to lobed, to a zone in which its cross-section exhibits at least one lobe (16) extending helically around and along the duct. The duct has a cross-sectional area which is substantially constant, or which progressively increases, over the transition zone. The transition from circular to lobed cross-section is alternatively smooth and continuous, and the transition zone occupies a duct length in which the or each lobe becomes relocated by at least one position.

La présente invention concerne une conduite (10) qui sert à acheminer un mélange biphasique et présente une partie allongée de section circulaire (12) qui mène, en passant par une zone de transition (14) dans laquelle la section de la conduite passe d'une forme circulaire à une forme lobée, à une zone dans laquelle sa section comprend au moins un lobe (16) qui s'étend de façon hélicoïdale autour et le long de la conduite. La conduite a une aire de section transversale qui est sensiblement constante ou qui croit de façon progressive sur la zone dans de transition. La transition de la section de la forme circulaire à la forme lobée se fait alternativement de façon homogène et continue, et la zone de transition occupe une longueur de la conduite sur laquelle le lobe ou chaque lobe est translaté en au moins un emplacement.

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