Two-phase flow nozzle

A two-phase fluid spraying nozzle comprising:

• an outer case;
• a liquid nozzle holder which is accommodated inside said outer case;
• a liquid nozzle supported on said liquid nozzle holder;
• a gas nozzle having a circular disc that is spaced apart from an upper surface of said liquid nozzle so as to form gas exiting gaps therebetween;
• wherein said liquid nozzle includes an upper portion with a larger outer diameter, a lower portion with a smaller outer diameter, and an intermediate portion that extends from the upper portion to the lower portion and is gradually reduced in diameter, and where a side wall of said lower portion includes a tapered surface curved vertically, wherein said outer case is provided with a cylindrical containable space for containing the liquid nozzle holder extending from a pre-determined position thereof in a vertical direction, and
• wherein said liquid nozzle holder is installed independent from or integrated with said outer case, said liquid nozzle holder having a base part installed in the containable space of the outer case, and a reduced diameter upper part extending vertically from the base part to a middle portion of said containable space of the outer case, and the base part having an outer diameter that has sufficient clearance for installation within the containable space, and the upper part of the reduced diameter upper part being a liquid holder part with an open upper part, and the inside thereof being the containable space for containing the lower diameter reducing part of the liquid nozzle in a loosely fitted state,
• wherein the intermediate portion of said liquid nozzle includes an annular offset portion that extends inwardly from an outer periphery of the larger outer diameter of the upper portion, and a supported portion with a convex spherical surface, where said supported portion extends from an inner periphery of the annular offset portion to an outer periphery of the smaller outer diameter of the lower portion, and where a concave spherical surface of the nozzle holder faces and supports said convex supported spherical surface of the supported portion of the intermediate portion of the liquid nozzle,
• wherein a liquid passage is provided in said liquid nozzle and opens to a liquid spraying exit at an upper part of said liquid nozzle, a circular recess at the upper surface of said liquid nozzle defining said liquid spraying exit,
• wherein a plurality of extrusions to form said gas exiting gaps between an upper surface of said liquid nozzle and the circular disc of said gas nozzle is provided on the upper surface of said liquid nozzle, where said plurality of extrusions are formed as a revolving surface having outer diameters expanded gradually from a top portion to a bottom portion,
• wherein a compressed gas for atomizing is fed from a gas passage to said gas exiting gaps, where said gas passage is formed between outer peripheries from upper portion of smaller outer diameter of said liquid nozzle holder to upper portion of larger outer diameter of said liquid nozzle and an inner periphery of containable space of said outer case, wherein said compressed gas for atomizing is fed from an outer periphery of said liquid nozzle to the liquid injected from said liquid exiting exit.