A fluid ejection nozzle is disclosed which facilitates a wide distribution of fluid therefrom and which permits the fluid flow rate to be easily adjustable. The nozzle is particularly adapted to a heat rejection system useful in a space environment. The nozzle includes a flow distributor positioned within an orifice of the nozzle housing which is comprised of a tongue member and an attached flow control block. Adjustment screws mounted through the nozzle housing permit axial movement of the flow distributor within the housing, thus controlling the flow rate of the fluid even to the extent of total shut-off. The tongue member is shaped to widely disperse the fluid, and includes turbulence generators such as roughening or ridges for facilitating its dispersion.