Abstract: An atomising nozzle (10) has an inlet (16), an outlet orifice (21) and an internal fluid flow passageway (20) which connects the inlet (16) to the outlet orifice (21). The nozzle (10) has a body with two component parts (12A, 12B) each component part having an abutment surface (22, 24) which contacts a corresponding abutment surface on the other of the parts. At least one of the abutment surfaces has at least one groove and/or recess (26a-34a; 26b-34b) therein to define part of the fluid flow passageway (20), including an expansion chamber (28). The body has a fixed partition means (44) which extends into the expansion chamber (28) to define one or more than one constricted openings (48) through which fluid is constrained to flow.

Abstract: A nozzle arrangement includes a chamber (204) having a plurality of divergent inlet orifices (203) which are directed towards opposed walls (205) or sidewalls (206) of the chamber (204).

Abstract: Nozzle arrangement for generating a spray of fluid comprise a body defining a flow passageway (10), which receives fluid from a supply via an inlet (11 or 12) and is configured to present a plurality of chambers (13, 16, 20) separated by constriction such as (15, 17). The chambers include expansion chambers such as (13, 20), and the constrictions may be associated with respective convergent and divergent passage sections (14, 19). The inner surfaces of the passageway or chambers, may be provide with small scale structures such as grooves, ribs, pits or protrusions.

Abstract: A nozzle arrangement comprises a body (10) of two parts (11), (12) which define between them a fluid passage (15), leading to a discharge outlet (25), from a feed passage (17). The passageway contains a chamber (19) wherein is located a flap member (20) which can be displaced by increased pressure of fluid flow in the passageway to variably obstruct an outlet orifice (21). This may be achieved by the cooperation of holes or notches in the displaceable flap member and corresponding apertures or notches in a fixed member.